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koa-onerror

NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome

an error handler for koa, hack ctx.onerror.

different with koa-error:

  • we can not just use try catch to handle all errors, steams' and events' errors are directly handle by ctx.onerror, so if we want to handle all errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.

install

npm install koa-onerror

Usage

constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});

Options

onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page

check out default handler to write your own handler.

Status and Headers

koa-onerror will automatic set err.status as response status code, and err.headers as response headers.

License

MIT

Contributors

Contributors

Made with contributors-img.

About

an error handler for koa, hack ctx.onerror

Resources

Readme
MIT license

Code of conduct

Code of conduct

Contributing

Contributing

Security policy

Security policy
Activity
Custom properties

Stars

141 stars

Watchers

6 watching

Forks

19 forks
Report repository

Releases

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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BranchesTags
Repository files navigation
koa-onerror
NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome
an error handler for koa, hack ctx.onerror.
different with koa-error:
  • we can not just use try catch to handle all errors, steams' and events'
errors are directly handle by ctx.onerror, so if we want to handle all
errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.
install
npm install koa-onerror
Usage
constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});
Options
onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page
check out default handler to write your own handler.
Status and Headers
koa-onerror will automatic set err.status as response status code, and err.headers as response headers.
License
MIT
Contributors
Contributors
Made with contributors-img.
About
an error handler for koa, hack ctx.onerror
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
141 stars
Watchers
6 watching
Forks
19 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} 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
koa-onerror
NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome
an error handler for koa, hack ctx.onerror.
different with koa-error:
  • we can not just use try catch to handle all errors, steams' and events'
errors are directly handle by ctx.onerror, so if we want to handle all
errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.
install
npm install koa-onerror
Usage
constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});
Options
onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page
check out default handler to write your own handler.
Status and Headers
koa-onerror will automatic set err.status as response status code, and err.headers as response headers.
License
MIT
Contributors
Contributors
Made with contributors-img.
About
an error handler for koa, hack ctx.onerror
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
141 stars
Watchers
6 watching
Forks
19 forks
Report repository
Releases
Used by
Contributors
Languages

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

Skip to content
BranchesTags
Repository files navigation
koa-onerror
NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome
an error handler for koa, hack ctx.onerror.
different with koa-error:
  • we can not just use try catch to handle all errors, steams' and events'
errors are directly handle by ctx.onerror, so if we want to handle all
errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.
install
npm install koa-onerror
Usage
constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});
Options
onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page
check out default handler to write your own handler.
Status and Headers
koa-onerror will automatic set err.status as response status code, and err.headers as response headers.
License
MIT
Contributors
Contributors
Made with contributors-img.
About
an error handler for koa, hack ctx.onerror
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
141 stars
Watchers
6 watching
Forks
19 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} 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
koa-onerror
NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome
an error handler for koa, hack ctx.onerror.
different with koa-error:
  • we can not just use try catch to handle all errors, steams' and events'
errors are directly handle by ctx.onerror, so if we want to handle all
errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.
install
npm install koa-onerror
Usage
constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});
Options
onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page
check out default handler to write your own handler.
Status and Headers
koa-onerror will automatic set err.status as response status code, and err.headers as response headers.
License
MIT
Contributors
Contributors
Made with contributors-img.
About
an error handler for koa, hack ctx.onerror
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
141 stars
Watchers
6 watching
Forks
19 forks
Report repository
Releases
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} 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
koa-onerror
NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome
an error handler for koa, hack ctx.onerror.
different with koa-error:
  • we can not just use try catch to handle all errors, steams' and events'
errors are directly handle by ctx.onerror, so if we want to handle all
errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.
install
npm install koa-onerror
Usage
constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});
Options
onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page
check out default handler to write your own handler.
Status and Headers
koa-onerror will automatic set err.status as response status code, and err.headers as response headers.
License
MIT
Contributors
Contributors
Made with contributors-img.
About
an error handler for koa, hack ctx.onerror
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
141 stars
Watchers
6 watching
Forks
19 forks
Report repository
Releases
Used by
Contributors
Languages

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

Skip to content
BranchesTags
Repository files navigation
koa-onerror
NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome
an error handler for koa, hack ctx.onerror.
different with koa-error:
  • we can not just use try catch to handle all errors, steams' and events'
errors are directly handle by ctx.onerror, so if we want to handle all
errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.
install
npm install koa-onerror
Usage
constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});
Options
onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page
check out default handler to write your own handler.
Status and Headers
koa-onerror will automatic set err.status as response status code, and err.headers as response headers.
License
MIT
Contributors
Contributors
Made with contributors-img.
About
an error handler for koa, hack ctx.onerror
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
141 stars
Watchers
6 watching
Forks
19 forks
Report repository
Releases
Used by
Contributors
Languages

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

Skip to content
BranchesTags
Repository files navigation
koa-onerror
NPM versionTest coverageKnown Vulnerabilitiesnpm downloadNode.js VersionPRs Welcome
an error handler for koa, hack ctx.onerror.
different with koa-error:
  • we can not just use try catch to handle all errors, steams' and events'
errors are directly handle by ctx.onerror, so if we want to handle all
errors in one place, the only way i can see is to hack ctx.onerror.
  • it is more customizable.
install
npm install koa-onerror
Usage
constfs=require('fs');constKoa=require('koa');const{ onerror }=require('koa-onerror');constapp=newKoa();onerror(app);app.use(ctx=>{// foo();ctx.body=fs.createReadStream('not exist');});
Options
onerror(app,options);
  • all: if options.all exist, ignore negotiation
  • text: text error handler
  • json: json error handler
  • html: html error handler
  • redirect: if accept html or text, can redirect to another error page
check out default handler to write your own handler.
Status and Headers
koa-onerror will automatic set err.status as response status code, and err.headers as response headers.
License
MIT
Contributors
Contributors
Made with contributors-img.
About
an error handler for koa, hack ctx.onerror
Resources
Readme
MIT license
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Custom properties
Stars
141 stars
Watchers
6 watching
Forks
19 forks
Report repository
Releases
Used by
Contributors
Languages