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Go ReferenceGithubGolangCIGo 1.19+platforms

The CUE Data Constraint Language

Configure, Unify, Execute

CUE is an open source data constraint language which aims to simplify tasks involving defining and using data.

It is a superset of JSON, allowing users familiar with JSON to get started quickly.

What is it for?

You can use CUE to

  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts

How?

CUE merges the notion of schema and data. The same CUE definition can simultaneously be used for validating data and act as a template to reduce boilerplate. Schema definition is enriched with fine-grained value definitions and default values. At the same time, data can be simplified by removing values implied by such detailed definitions. The merging of these two concepts enables many tasks to be handled in a principled way.

Constraints provide a simple and well-defined, yet powerful, alternative to inheritance, a common source of complexity with configuration languages.

CUE Scripting

The CUE scripting layer defines declarative scripting, expressed in CUE, on top of data. This solves three problems: working around the closedness of CUE definitions (we say CUE is hermetic), providing an easy way to share common scripts and workflows for using data, and giving CUE the knowledge of how data is used to optimize validation.

There are many tools that interpret data or use a specialized language for a specific domain (Kustomize, Ksonnet). This solves dealing with data on one level, but the problem it solves may repeat itself at a higher level when integrating other systems in a workflow. CUE scripting is generic and allows users to define any workflow.

Tooling

CUE is designed for automation. Some aspects of this are:

  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)

Download and Install

Release builds

Download the latest release from GitHub.

Install using Homebrew

Using Homebrew, you can install using the CUE Homebrew tap:

brew install cue-lang/tap/cue

Install from Source

To install the cue command line tool, run:

go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.

Learning CUE

The fastest way to learn the basics is to follow the tutorial on basic language constructs.

A more elaborate tutorial demonstrating of how to convert and restructure an existing set of Kubernetes configurations is available in written form.

References

Contributing

Our canonical Git repository is located at https://review.gerrithub.io/q/project:cue-lang%252Fcue.

To contribute, please read the Contribution Guide.

To report issues or make a feature request, use the issue tracker.

Changes can be contributed using Gerrit or Github pull requests.

Code of Conduct

Guidelines for participating in CUE community spaces and a reporting process for handling issues can be found in the Code of Conduct.

Contact

You can get in touch with the cuelang community in the following ways:

Unless otherwise noted, the CUE source files are distributed under the Apache 2.0 license found in the LICENSE file.

This is not an officially supported Google product.

About

The home of the CUE language! Validate and define text-based and dynamic configuration

cuelang.org/

Resources

Readme
License

Contributing

Contributing
Activity
Custom properties

Stars

0 stars

Watchers

0 watching

Forks

0 forks
Report repository

Releases

Packages

Contributors

Languages

, '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
BranchesTags
Repository files navigation
Go ReferenceGithubGolangCIGo 1.19+platforms
The CUE Data Constraint Language
Configure, Unify, Execute
CUE is an open source data constraint language which aims
to simplify tasks involving defining and using data.
It is a superset of JSON,
allowing users familiar with JSON to get started quickly.
What is it for?
You can use CUE to
  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts
How?
CUE merges the notion of schema and data.
The same CUE definition can simultaneously be used for validating data
and act as a template to reduce boilerplate.
Schema definition is enriched with fine-grained value definitions
and default values.
At the same time,
data can be simplified by removing values implied by such detailed definitions.
The merging of these two concepts enables
many tasks to be handled in a principled way.
Constraints provide a simple and well-defined, yet powerful, alternative
to inheritance,
a common source of complexity with configuration languages.
CUE Scripting
The CUE scripting layer defines declarative scripting, expressed in CUE,
on top of data.
This solves three problems:
working around the closedness of CUE definitions (we say CUE is hermetic),
providing an easy way to share common scripts and workflows for using data,
and giving CUE the knowledge of how data is used to optimize validation.
There are many tools that interpret data or use a specialized language for
a specific domain (Kustomize, Ksonnet).
This solves dealing with data on one level, but the problem it solves may repeat
itself at a higher level when integrating other systems in a workflow.
CUE scripting is generic and allows users to define any workflow.
Tooling
CUE is designed for automation.
Some aspects of this are:
  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)
Download and Install
Release builds
Download the latest release from GitHub.
Install using Homebrew
Using Homebrew, you can install using the CUE Homebrew tap:
brew install cue-lang/tap/cue

Install from Source
To install the cue command line tool, run:
go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.
Learning CUE
The fastest way to learn the basics is to follow the
tutorial on basic language constructs.
A more elaborate tutorial demonstrating of how to convert and restructure
an existing set of Kubernetes configurations is available in
written form.
References
Contributing
Our canonical Git repository is located at
https://review.gerrithub.io/q/project:cue-lang%252Fcue.
To contribute, please read the Contribution Guide.
To report issues or make a feature request, use the
issue tracker.
Changes can be contributed using Gerrit or Github pull requests.
Code of Conduct
Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of
Conduct.
Contact
You can get in touch with the cuelang community in the following ways:
Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.
This is not an officially supported Google product.
About
The home of the CUE language! Validate and define text-based and dynamic configuration
cuelang.org/
Resources
Readme
License
Contributing
Contributing
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
Go ReferenceGithubGolangCIGo 1.19+platforms
The CUE Data Constraint Language
Configure, Unify, Execute
CUE is an open source data constraint language which aims
to simplify tasks involving defining and using data.
It is a superset of JSON,
allowing users familiar with JSON to get started quickly.
What is it for?
You can use CUE to
  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts
How?
CUE merges the notion of schema and data.
The same CUE definition can simultaneously be used for validating data
and act as a template to reduce boilerplate.
Schema definition is enriched with fine-grained value definitions
and default values.
At the same time,
data can be simplified by removing values implied by such detailed definitions.
The merging of these two concepts enables
many tasks to be handled in a principled way.
Constraints provide a simple and well-defined, yet powerful, alternative
to inheritance,
a common source of complexity with configuration languages.
CUE Scripting
The CUE scripting layer defines declarative scripting, expressed in CUE,
on top of data.
This solves three problems:
working around the closedness of CUE definitions (we say CUE is hermetic),
providing an easy way to share common scripts and workflows for using data,
and giving CUE the knowledge of how data is used to optimize validation.
There are many tools that interpret data or use a specialized language for
a specific domain (Kustomize, Ksonnet).
This solves dealing with data on one level, but the problem it solves may repeat
itself at a higher level when integrating other systems in a workflow.
CUE scripting is generic and allows users to define any workflow.
Tooling
CUE is designed for automation.
Some aspects of this are:
  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)
Download and Install
Release builds
Download the latest release from GitHub.
Install using Homebrew
Using Homebrew, you can install using the CUE Homebrew tap:
brew install cue-lang/tap/cue

Install from Source
To install the cue command line tool, run:
go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.
Learning CUE
The fastest way to learn the basics is to follow the
tutorial on basic language constructs.
A more elaborate tutorial demonstrating of how to convert and restructure
an existing set of Kubernetes configurations is available in
written form.
References
Contributing
Our canonical Git repository is located at
https://review.gerrithub.io/q/project:cue-lang%252Fcue.
To contribute, please read the Contribution Guide.
To report issues or make a feature request, use the
issue tracker.
Changes can be contributed using Gerrit or Github pull requests.
Code of Conduct
Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of
Conduct.
Contact
You can get in touch with the cuelang community in the following ways:
Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.
This is not an officially supported Google product.
About
The home of the CUE language! Validate and define text-based and dynamic configuration
cuelang.org/
Resources
Readme
License
Contributing
Contributing
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
Go ReferenceGithubGolangCIGo 1.19+platforms
The CUE Data Constraint Language
Configure, Unify, Execute
CUE is an open source data constraint language which aims
to simplify tasks involving defining and using data.
It is a superset of JSON,
allowing users familiar with JSON to get started quickly.
What is it for?
You can use CUE to
  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts
How?
CUE merges the notion of schema and data.
The same CUE definition can simultaneously be used for validating data
and act as a template to reduce boilerplate.
Schema definition is enriched with fine-grained value definitions
and default values.
At the same time,
data can be simplified by removing values implied by such detailed definitions.
The merging of these two concepts enables
many tasks to be handled in a principled way.
Constraints provide a simple and well-defined, yet powerful, alternative
to inheritance,
a common source of complexity with configuration languages.
CUE Scripting
The CUE scripting layer defines declarative scripting, expressed in CUE,
on top of data.
This solves three problems:
working around the closedness of CUE definitions (we say CUE is hermetic),
providing an easy way to share common scripts and workflows for using data,
and giving CUE the knowledge of how data is used to optimize validation.
There are many tools that interpret data or use a specialized language for
a specific domain (Kustomize, Ksonnet).
This solves dealing with data on one level, but the problem it solves may repeat
itself at a higher level when integrating other systems in a workflow.
CUE scripting is generic and allows users to define any workflow.
Tooling
CUE is designed for automation.
Some aspects of this are:
  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)
Download and Install
Release builds
Download the latest release from GitHub.
Install using Homebrew
Using Homebrew, you can install using the CUE Homebrew tap:
brew install cue-lang/tap/cue

Install from Source
To install the cue command line tool, run:
go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.
Learning CUE
The fastest way to learn the basics is to follow the
tutorial on basic language constructs.
A more elaborate tutorial demonstrating of how to convert and restructure
an existing set of Kubernetes configurations is available in
written form.
References
Contributing
Our canonical Git repository is located at
https://review.gerrithub.io/q/project:cue-lang%252Fcue.
To contribute, please read the Contribution Guide.
To report issues or make a feature request, use the
issue tracker.
Changes can be contributed using Gerrit or Github pull requests.
Code of Conduct
Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of
Conduct.
Contact
You can get in touch with the cuelang community in the following ways:
Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.
This is not an officially supported Google product.
About
The home of the CUE language! Validate and define text-based and dynamic configuration
cuelang.org/
Resources
Readme
License
Contributing
Contributing
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, '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" + '

Skip to content
BranchesTags
Repository files navigation
Go ReferenceGithubGolangCIGo 1.19+platforms
The CUE Data Constraint Language
Configure, Unify, Execute
CUE is an open source data constraint language which aims
to simplify tasks involving defining and using data.
It is a superset of JSON,
allowing users familiar with JSON to get started quickly.
What is it for?
You can use CUE to
  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts
How?
CUE merges the notion of schema and data.
The same CUE definition can simultaneously be used for validating data
and act as a template to reduce boilerplate.
Schema definition is enriched with fine-grained value definitions
and default values.
At the same time,
data can be simplified by removing values implied by such detailed definitions.
The merging of these two concepts enables
many tasks to be handled in a principled way.
Constraints provide a simple and well-defined, yet powerful, alternative
to inheritance,
a common source of complexity with configuration languages.
CUE Scripting
The CUE scripting layer defines declarative scripting, expressed in CUE,
on top of data.
This solves three problems:
working around the closedness of CUE definitions (we say CUE is hermetic),
providing an easy way to share common scripts and workflows for using data,
and giving CUE the knowledge of how data is used to optimize validation.
There are many tools that interpret data or use a specialized language for
a specific domain (Kustomize, Ksonnet).
This solves dealing with data on one level, but the problem it solves may repeat
itself at a higher level when integrating other systems in a workflow.
CUE scripting is generic and allows users to define any workflow.
Tooling
CUE is designed for automation.
Some aspects of this are:
  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)
Download and Install
Release builds
Download the latest release from GitHub.
Install using Homebrew
Using Homebrew, you can install using the CUE Homebrew tap:
brew install cue-lang/tap/cue

Install from Source
To install the cue command line tool, run:
go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.
Learning CUE
The fastest way to learn the basics is to follow the
tutorial on basic language constructs.
A more elaborate tutorial demonstrating of how to convert and restructure
an existing set of Kubernetes configurations is available in
written form.
References
Contributing
Our canonical Git repository is located at
https://review.gerrithub.io/q/project:cue-lang%252Fcue.
To contribute, please read the Contribution Guide.
To report issues or make a feature request, use the
issue tracker.
Changes can be contributed using Gerrit or Github pull requests.
Code of Conduct
Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of
Conduct.
Contact
You can get in touch with the cuelang community in the following ways:
Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.
This is not an officially supported Google product.
About
The home of the CUE language! Validate and define text-based and dynamic configuration
cuelang.org/
Resources
Readme
License
Contributing
Contributing
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, '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('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Go ReferenceGithubGolangCIGo 1.19+platforms
The CUE Data Constraint Language
Configure, Unify, Execute
CUE is an open source data constraint language which aims
to simplify tasks involving defining and using data.
It is a superset of JSON,
allowing users familiar with JSON to get started quickly.
What is it for?
You can use CUE to
  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts
How?
CUE merges the notion of schema and data.
The same CUE definition can simultaneously be used for validating data
and act as a template to reduce boilerplate.
Schema definition is enriched with fine-grained value definitions
and default values.
At the same time,
data can be simplified by removing values implied by such detailed definitions.
The merging of these two concepts enables
many tasks to be handled in a principled way.
Constraints provide a simple and well-defined, yet powerful, alternative
to inheritance,
a common source of complexity with configuration languages.
CUE Scripting
The CUE scripting layer defines declarative scripting, expressed in CUE,
on top of data.
This solves three problems:
working around the closedness of CUE definitions (we say CUE is hermetic),
providing an easy way to share common scripts and workflows for using data,
and giving CUE the knowledge of how data is used to optimize validation.
There are many tools that interpret data or use a specialized language for
a specific domain (Kustomize, Ksonnet).
This solves dealing with data on one level, but the problem it solves may repeat
itself at a higher level when integrating other systems in a workflow.
CUE scripting is generic and allows users to define any workflow.
Tooling
CUE is designed for automation.
Some aspects of this are:
  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)
Download and Install
Release builds
Download the latest release from GitHub.
Install using Homebrew
Using Homebrew, you can install using the CUE Homebrew tap:
brew install cue-lang/tap/cue

Install from Source
To install the cue command line tool, run:
go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.
Learning CUE
The fastest way to learn the basics is to follow the
tutorial on basic language constructs.
A more elaborate tutorial demonstrating of how to convert and restructure
an existing set of Kubernetes configurations is available in
written form.
References
Contributing
Our canonical Git repository is located at
https://review.gerrithub.io/q/project:cue-lang%252Fcue.
To contribute, please read the Contribution Guide.
To report issues or make a feature request, use the
issue tracker.
Changes can be contributed using Gerrit or Github pull requests.
Code of Conduct
Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of
Conduct.
Contact
You can get in touch with the cuelang community in the following ways:
Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.
This is not an officially supported Google product.
About
The home of the CUE language! Validate and define text-based and dynamic configuration
cuelang.org/
Resources
Readme
License
Contributing
Contributing
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
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Contributors
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, '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
BranchesTags
Repository files navigation
Go ReferenceGithubGolangCIGo 1.19+platforms
The CUE Data Constraint Language
Configure, Unify, Execute
CUE is an open source data constraint language which aims
to simplify tasks involving defining and using data.
It is a superset of JSON,
allowing users familiar with JSON to get started quickly.
What is it for?
You can use CUE to
  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts
How?
CUE merges the notion of schema and data.
The same CUE definition can simultaneously be used for validating data
and act as a template to reduce boilerplate.
Schema definition is enriched with fine-grained value definitions
and default values.
At the same time,
data can be simplified by removing values implied by such detailed definitions.
The merging of these two concepts enables
many tasks to be handled in a principled way.
Constraints provide a simple and well-defined, yet powerful, alternative
to inheritance,
a common source of complexity with configuration languages.
CUE Scripting
The CUE scripting layer defines declarative scripting, expressed in CUE,
on top of data.
This solves three problems:
working around the closedness of CUE definitions (we say CUE is hermetic),
providing an easy way to share common scripts and workflows for using data,
and giving CUE the knowledge of how data is used to optimize validation.
There are many tools that interpret data or use a specialized language for
a specific domain (Kustomize, Ksonnet).
This solves dealing with data on one level, but the problem it solves may repeat
itself at a higher level when integrating other systems in a workflow.
CUE scripting is generic and allows users to define any workflow.
Tooling
CUE is designed for automation.
Some aspects of this are:
  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)
Download and Install
Release builds
Download the latest release from GitHub.
Install using Homebrew
Using Homebrew, you can install using the CUE Homebrew tap:
brew install cue-lang/tap/cue

Install from Source
To install the cue command line tool, run:
go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.
Learning CUE
The fastest way to learn the basics is to follow the
tutorial on basic language constructs.
A more elaborate tutorial demonstrating of how to convert and restructure
an existing set of Kubernetes configurations is available in
written form.
References
Contributing
Our canonical Git repository is located at
https://review.gerrithub.io/q/project:cue-lang%252Fcue.
To contribute, please read the Contribution Guide.
To report issues or make a feature request, use the
issue tracker.
Changes can be contributed using Gerrit or Github pull requests.
Code of Conduct
Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of
Conduct.
Contact
You can get in touch with the cuelang community in the following ways:
Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.
This is not an officially supported Google product.
About
The home of the CUE language! Validate and define text-based and dynamic configuration
cuelang.org/
Resources
Readme
License
Contributing
Contributing
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, '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
BranchesTags
Repository files navigation
Go ReferenceGithubGolangCIGo 1.19+platforms
The CUE Data Constraint Language
Configure, Unify, Execute
CUE is an open source data constraint language which aims
to simplify tasks involving defining and using data.
It is a superset of JSON,
allowing users familiar with JSON to get started quickly.
What is it for?
You can use CUE to
  • define a detailed validation schema for your data (manually or automatically from data)
  • reduce boilerplate in your data (manually or automatically from schema)
  • extract a schema from code
  • generate type definitions and validation code
  • merge JSON in a principled way
  • define and run declarative scripts
How?
CUE merges the notion of schema and data.
The same CUE definition can simultaneously be used for validating data
and act as a template to reduce boilerplate.
Schema definition is enriched with fine-grained value definitions
and default values.
At the same time,
data can be simplified by removing values implied by such detailed definitions.
The merging of these two concepts enables
many tasks to be handled in a principled way.
Constraints provide a simple and well-defined, yet powerful, alternative
to inheritance,
a common source of complexity with configuration languages.
CUE Scripting
The CUE scripting layer defines declarative scripting, expressed in CUE,
on top of data.
This solves three problems:
working around the closedness of CUE definitions (we say CUE is hermetic),
providing an easy way to share common scripts and workflows for using data,
and giving CUE the knowledge of how data is used to optimize validation.
There are many tools that interpret data or use a specialized language for
a specific domain (Kustomize, Ksonnet).
This solves dealing with data on one level, but the problem it solves may repeat
itself at a higher level when integrating other systems in a workflow.
CUE scripting is generic and allows users to define any workflow.
Tooling
CUE is designed for automation.
Some aspects of this are:
  • convert existing YAML and JSON
  • automatically simplify configurations
  • rich APIs designed for automated tooling
  • formatter
  • arbitrary-precision arithmetic
  • generate CUE templates from source code
  • generate source code from CUE definitions (TODO)
Download and Install
Release builds
Download the latest release from GitHub.
Install using Homebrew
Using Homebrew, you can install using the CUE Homebrew tap:
brew install cue-lang/tap/cue

Install from Source
To install the cue command line tool, run:
go install cuelang.org/go/cmd/cue@latest

For more details, see Installing CUE.
Learning CUE
The fastest way to learn the basics is to follow the
tutorial on basic language constructs.
A more elaborate tutorial demonstrating of how to convert and restructure
an existing set of Kubernetes configurations is available in
written form.
References
Contributing
Our canonical Git repository is located at
https://review.gerrithub.io/q/project:cue-lang%252Fcue.
To contribute, please read the Contribution Guide.
To report issues or make a feature request, use the
issue tracker.
Changes can be contributed using Gerrit or Github pull requests.
Code of Conduct
Guidelines for participating in CUE community spaces and a reporting process for
handling issues can be found in the Code of
Conduct.
Contact
You can get in touch with the cuelang community in the following ways:
Unless otherwise noted, the CUE source files are distributed
under the Apache 2.0 license found in the LICENSE file.
This is not an officially supported Google product.
About
The home of the CUE language! Validate and define text-based and dynamic configuration
cuelang.org/
Resources
Readme
License
Contributing
Contributing
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages