📝 Update install and usage with FastAPI CLI in FastAPI tutorial#1350

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📝 Update install and usage with FastAPI CLI in FastAPI tutorial #1350

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40 changes: 12 additions & 28 deletions docs/tutorial/fastapi/simple-hero-api.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

Expand Down
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
📝 Update install and usage with FastAPI CLI in FastAPI tutorial#1350

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 Merged

tiangolo
merged 1 commit into

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Apr 27, 2025

+12

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📝 Update install and usage with FastAPI CLI in FastAPI tutorial
#1350
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40 changes: 12 additions & 28 deletions
docs/tutorial/fastapi/simple-hero-api.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
📝 Update install and usage with FastAPI CLI in FastAPI tutorial#1350

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

 Sign up for GitHub

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Already on GitHub?
Sign in
to your account

 Merged

tiangolo
merged 1 commit into

from

Apr 27, 2025

+12

−28

 Merged


📝 Update install and usage with FastAPI CLI in FastAPI tutorial
#1350
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40 changes: 12 additions & 28 deletions
docs/tutorial/fastapi/simple-hero-api.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
📝 Update install and usage with FastAPI CLI in FastAPI tutorial#1350

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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Already on GitHub?
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 Merged

tiangolo
merged 1 commit into

from

Apr 27, 2025

+12

−28

 Merged


📝 Update install and usage with FastAPI CLI in FastAPI tutorial
#1350
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40 changes: 12 additions & 28 deletions
docs/tutorial/fastapi/simple-hero-api.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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40 changes: 12 additions & 28 deletions
docs/tutorial/fastapi/simple-hero-api.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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📝 Update install and usage with FastAPI CLI in FastAPI tutorial#1350

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 Merged

tiangolo
merged 1 commit into

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📝 Update install and usage with FastAPI CLI in FastAPI tutorial
#1350
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40 changes: 12 additions & 28 deletions
docs/tutorial/fastapi/simple-hero-api.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
📝 Update install and usage with FastAPI CLI in FastAPI tutorial#1350

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 Merged

tiangolo
merged 1 commit into

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Apr 27, 2025

+12

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📝 Update install and usage with FastAPI CLI in FastAPI tutorial
#1350
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40 changes: 12 additions & 28 deletions
docs/tutorial/fastapi/simple-hero-api.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

Expand Down

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
📝 Update install and usage with FastAPI CLI in FastAPI tutorial#1350

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 Merged

tiangolo
merged 1 commit into

from

Apr 27, 2025

+12

−28

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📝 Update install and usage with FastAPI CLI in FastAPI tutorial
#1350
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40 changes: 12 additions & 28 deletions
docs/tutorial/fastapi/simple-hero-api.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,10 +8,6 @@ The first step is to install FastAPI.

FastAPI is the framework to create the **web API**.

But we also need another type of program to run it, it is called a "**server**". We will use **Uvicorn** for that. And we will install Uvicorn with its *standard* dependencies.

Then install FastAPI.

Make sure you create a [virtual environment](../../virtual-environments.md){.internal-link target=_blank}, activate it, and then install them, for example with:

<div class="termy">
Expand DownExpand Up@@ -138,60 +134,48 @@ In this simple example, we just create the new sessions manually in the **path o

In future examples later we will use a <a href="https://fastapi.tiangolo.com/tutorial/dependencies/" class="external-link" target="_blank">FastAPI Dependency</a> to get the **session**, being able to share it with other dependencies and being able to replace it during testing. 🤓

## Run the **FastAPI** Application
## Run the **FastAPI** Server in Development Mode

Now we are ready to run the FastAPI application.

Put all that code in a file called `main.py`.

Then run it with **Uvicorn**:
Then run it with the `fastapi` <abbr title="Command Line Interface">CLI</abbr>, in development mode:

<div class="termy">

```console
$ uvicorn main:app
$ fastapi dev main.py

<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
```

</div>

/// info

The command `uvicorn main:app` refers to:

* `main`: the file `main.py` (the Python "module").
* `app`: the object created inside of `main.py` with the line `app = FastAPI()`.
The `fastapi` command uses <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a> underneath.

///

### Uvicorn `--reload`
When you use `fastapi dev` it starts Uvicorn with the option to reload automatically every time you make a change to the code, this way you will be able to develop faster. 🤓

During development (and only during development), you can also add the option `--reload` to Uvicorn.
## Run the **FastAPI** Server in Production Mode

It will restart the server every time you make a change to the code, this way you will be able to develop faster. 🤓
The development mode should not be used in production, as it includes automatic reload by default it consumes much more resources than necessary, and it would be more error prone, etc.

For production, use `fastapi run` instead of `fastapi dev`:

<div class="termy">

```console
$ uvicorn main:app --reload
$ fastapi run main.py

<span style="color: green;">INFO</span>: Will watch for changes in these directories: ['/home/user/code/sqlmodel-tutorial']
<span style="color: green;">INFO</span>: Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>: Started reloader process [28720]
<span style="color: green;">INFO</span>: Started server process [28722]
<span style="color: green;">INFO</span>: Waiting for application startup.
<span style="color: green;">INFO</span>: Application startup complete.
<span style="color: green;">INFO</span>: Uvicorn running on http://0.0.0.0:8000 (Press CTRL+C to quit)
```

</div>

Just remember to never use `--reload` in production, as it consumes much more resources than necessary, would be more error prone, etc.

## Check the API docs UI

Now you can go to that URL in your browser `http://127.0.0.1:8000`. We didn't create a *path operation* for the root path `/`, so that URL alone will only show a "Not Found" error... that "Not Found" error is produced by your FastAPI application.
Expand All@@ -212,7 +196,7 @@ And then you can get them back with the **Read Heroes** *path operation*:

## Check the Database

Now you can terminate that Uvicorn server by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.
Now you can terminate that server program by going back to the terminal and pressing <kbd>Ctrl+C</kbd>.

And then, you can open **DB Browser for SQLite** and check the database, to explore the data and confirm that it indeed saved the heroes. 🎉

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