awesome-devtools

🤖 A curated list of in-browser bookmarklets, tools, and resources for modern full-stack software engineers.

534

GitHub Stars

131

Curated Resources

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Add the Context Awesome MCP server to Claude, Cursor, or any MCP client, then ask:

"Show me validation & parsers resources from awesome-devtools"

Ada URL ParserValidation & Parsers
WHATWG-compliant and fast URL parser written in modern C++, online.
API Status CheckAPIs
Real-time status monitoring for 540+ APIs and services including AWS, Stripe, GitHub, and OpenAI.
Campaign MonitorCSS Inliners
Inline your CSS for HTML email.
Copy/Paste CharacterGlyphs & Icons
Copy & Paste emojis and unicode symbols
CSP EvaluatorValidation & Parsers
Evaluate CSP rules
CSS IconsGlyphs & Icons
Copy & Paste icons in CSS + transition animations!

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.
ASCII SilhouettifyImage
Convert images into ANSI-escaped color ASCII art.
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
Babel Time TravelDebug JavaScript
Travel in time as babel transpiles.

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.

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 131 resources. View the full list on GitHub →