awesome-devtools
github.com/moimikey/awesome-devtools ↗🤖 A curated list of in-browser bookmarklets, tools, and resources for modern full-stack software engineers.
Use this list with your AI agent
Add the Context Awesome MCP server to Claude, Cursor, or any MCP client, then ask:
"Show me validation & parsers resources from awesome-devtools"
Installation instructions →What's inside
Resources
- Ada URL ParserValidation & Parsers
WHATWG-compliant and fast URL parser written in modern C++, online.
- Campaign MonitorCSS Inliners
- CeaserEasings & Animations
- Copy/Paste CharacterGlyphs & Icons
Copy & Paste emojis and unicode symbols
- CORS AnywhereProxy as a Service
Proxies any HTTP request through a CORS enabled environment.
- CSP EvaluatorValidation & Parsers
Evaluate CSP rules
Web-based Tools
- ApiNotesDiffing
Compare two OpenAPI 3.x & Swagger 2.0 specifications side by side. Detect breaking changes, added/removed endpoints, and parameter diffs.
- asciiflowDiagramming & Scratch
ASCIIFlow is a client-side only web based application for drawing ASCII diagrams.
- Babel Time TravelDebug JavaScript
Travel in time as babel transpiles.
- ByteTools Passphrase GeneratorGenerators
Generate secure, memorable passphrases with customizable options. 100% client-side processing.
- ByteTools QR GeneratorGenerators
Generate QR codes including WiFi QR codes. Works offline, no data sent to servers.
- ClippyImage
CSS clip-path maker and editor.
Bookmarklets
- artoo.js
Client-side scraping utility for the currently loaded uri.
- DOM Monster
A cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on.
- Make Bookmarklets
Online tool to turn JavaScript into a bookmarklet.
- Related Repos
Quickly view alternative repositories while browsing on GitHub. Results are updated daily.
- Rulers Guides
A JavaScript library which enables Photoshop-like rulers and guides interface on a web page.
Notable Mentions
- ASCII Silhouettify
Convert images into ANSI-escaped color ASCII art.
- Octopus
Lightning-fast visual sitemap builder & website planner.
- Type Fluidity
Fluid typography
- TypeScriptToLua
TypeScript to Lua
Web-based Services
- AST ExplorerTransformation
Parse JS to an explorable AST tree via acorn, babel, babylon, espree, esprima, recast, shift, and typescript.
- Babel REPLTransformation
The compiler for next generation JavaScript
- Benchmark StudioPerformance
JS performance benchmarks
- ByteTools JWT DecoderTransformation
Decode and inspect JSON Web Tokens securely. 100% client-side processing, never sends tokens to servers.
- ByteTools Regex TestRegex
Free regex test tool with real-time matching, examples, and mobile optimization.
- ByteTools URL EncoderTransformation
Encode and decode URLs safely. Perfect for handling query parameters and API endpoints.
The Outside World
- DevSwagSwag
- StickerMuleSwag
Security
- HSTS PreloadTest
Check HSTS preload status and elibility.
- Mozilla ObservatoryTest
A set of tools to analyze your website and inform you if you are utilizing the many available methods to secure it.
- Mozilla SSL Configuration GeneratorSSL
SSL configuration generator for various server software and platforms.
- Security Headers by ProbelyTest
An easy to use tool designed to help you better deploy and understand modern security features that are available for your website.
- Self-Signed Certificate GeneratorSSL
A self-signed certificate generator.
- Web CheckTest
All-in-one OSINT tool for analysing any website.
Showing a sample of 159 resources. View the full list on GitHub →