Code & Developer Tools
Format, test, and transform code — regex, Base64, diff, formatters, and API helpers.
14 tools in this category
Regex Tester
Build and test regular expressions with live matches and explanations.
Base64 Encoder / Decoder
Encode or decode Base64 strings safely in your browser.
JSON Formatter & Validator
Pretty-print, minify, and validate JSON payloads.
Text Diff Tool
Compare two texts or code snippets side by side.
SQL Formatter
Format and beautify SQL queries for readability.
CSS Minifier / Beautifier
Minify or beautify CSS stylesheets.
HTML Minifier / Beautifier
Minify or prettify HTML markup.
JavaScript Beautifier / Minifier
Format or minify JavaScript source code.
Code Beautifier (Python, PHP)
Format PHP with Prettier; format Python with Black (Pyodide in the browser).
REST API Tester
A fully-featured API client with collections, environments, variable interpolation, auth helpers, and code generation. Like Postman, built into your browser.
Hash Generator (MD5, SHA256)
Compute MD5, SHA-256, and other hashes from text or files.
File Encryption / Decryption
Client-side encryption helpers with clear security guidance.
Code Snippets Repository
Save and organize reusable code snippets.
API Rate Limiter Simulator
Simulate token bucket and fixed-window rate limits for APIs.