awesome-devtools

Client-side scraping utility for the currently loaded uri

A cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on

Online tool to turn JavaScript into a bookmarklet

A JavaScript library which enables Photoshop-like rulers and guides interface on a web page

A browser-based tool to test any website's responsiveness

Travel in time as babel transpiles

Debug your JavaScript in the browser (lol?)

View realtime HTTP requests using a endpoints.dev generated URL

HTTP Request & Response service

Loupe-inspired JavaScript execution visualizer

Custom, mock JSON API

Similar in goal to SlowmoJS, a JavaScript call stack visualizer

Execute JavaScript in slow motion

A lightweight, web-based API development suite

Open source Postman alternative with type safety built in

REST & SOAP API Online Testing Tool

ASCIIFlow is a client-side only web based application for drawing ASCII diagrams

Draw Entity-Relationship Diagrams, Painlessly

Graphviz to ASCII converter using Graph::Easy

Virtual whiteboard

Create beautiful charts from JSON data in your browser

Visualize CSV/JSON/TOML/XML/YAML instantly into graphs

A flowchart editor designed for speed through keyboard shortcuts and autolayout

Visualize markdown as a feature-rich mindmaps

A tool for drawing UML diagrams based on a simple syntax

An online tool / software for creating UML sequence diagrams

Quickly highlight differences in plain text, code, or JSON files

Run a visual or non-visual diff on two JSON blobs

A simple editor to quickly add and customize all the sections you need for your project's readme

Create random JSON data

The easiest way to configure a performant, secure, and stable NGINX server

All in one tool to quickly generate a readme for your project or github profile

Create test data

CSS clip-path maker and editor

Literally generates every favicon neccessary + markup

Privacy-aware JPEG optimizer

Boost web performance with image optimization. Analyze and improve tags, tags, and inline CSS

Free conversion from JPG or PNG images To vectorized SVG

Compress and optimize images in browser

Convert your SVG files into CSS url (data URIs) by encoding it

Try (SVG Optimizer) in the browser!

The quick and simple editor for cron schedule expressions by Cronitor

CSS, Ready to use, click to copy

CSS, Ready to use, click to copy

CSS, Ready to use, click to copy

CSS, Ready to use, click to copy

Copy-and-paste'able collection of useful cross-browser DevTools snippets

Drop-in CSS transitions

Ephemeral file sharing. Convenient, anonymous and secure

Instant file transfer/sharing over WebTorrent

Instant file transfer over your local network (P2P)

JS benchmarks

Social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn and debug, and find inspiration

Online code editor and sandbox

The Elm Live Editor

Like RequireBin but ES2015

A fast, smart, & global CDN for modern(es2015+) web development

JS/Coffee/Babel/Babel/Live/JSX/HTML/Markdown/Pug/CSS/Stylus/LESS/Sass

JS/ES3/Coffee/HTML/CSS/Sass

JS/Typescript/Coffee/LiveScript/Babel/CSS/Sass/LESS/Stylus/HTML/Pug

PCRE/Python/JavaScript regex matching

PHP/Python/Ruby/JavaScript regex matching

JavaScript regex matching

JavaScript regex matching

JavaScript Regular Expression Visualizer

Parse JS to an explorable AST tree via acorn, babel, babylon, espree, esprima, recast, shift, and typescript

The compiler for next generation JavaScript

Run compilers interactively from your web browser and interact with the assembly

Automatically fix your JS, driven by JSHint

A simple but powerful deobfuscator to remove common JavaScript obfuscation techniques

Statistical renaming, type inference and deobfuscation

Sorts JSON alphabetically

Paste or type your markdown and see it rendered as HTML. Download or copy the resulting HTML

Tools to convert Markdown to/from a number of formats. E.g. Html to Markdown, or a CSV to a Markdown table

Super-fast Babel alternative

compile JS/TS files using modern JS features and outputs valid code that is supported by all major browsers

JavaScript parser, mangler and compressor toolkit for ES6+

A tool to bundle your web files into a single image, and extract them via Service Worker at runtime

translate C/C++ to WebAssembly, and then see the machine code generated by the browser

Create beautiful images of code snippets

Snappify enables you to create stunning presentations, with first-class support for code snippets

Generate JSON datasets for testing or demonstration purposes

Free fake API for testing and prototyping

Zipcode to Geo

A free CDN for open source projects

Load optimized npm packages with no install and no build tools

Fast, global content delivery network for everything on npm

A concise collection of high value information on specific application security topics

Basically but a web application and FREE

A better way to read MAN pages

Copy & Paste emojis and unicode symbols

Copy & Paste icons in CSS + transition animations!

Enter any character(s) and find its corresponding HTML entity code

Beautiful hand-crafted SVG icons, by the makers of Tailwind CSS

Millions of graphics for your design projects. Created by independent designers

Discover 4000+ free icons in 300+ collections

Over 150,000 open source vector icons

4000+ Open source free SVG icons. Highly customizable. No attribution required. For commercial use

Proxies any HTTP request through a CORS enabled environment

Validate phone numbers from over 200 countries

Evaluate CSP rules

WHATWG-compliant and fast URL parser written in modern C++, online

Validate Python code

A self-signed certificate generator

SSL configuration generator for various server software and platforms

Check HSTS preload status and elibility

A set of tools to analyze your website and inform you if you are utilizing the many available methods to secure it

An easy to use tool designed to help you better deploy and understand modern security features that are available for your website

All-in-one OSINT tool for analysing any website

Convert images into ANSI-escaped color ASCII art

Lightning-fast visual sitemap builder & website planner

Fluid typography value generator

TypeScript to Lua