Developer Tools
Free, browser-based utilities for CS students and developers.
All tools run entirely in your browser — no data is sent to any server.
JSON Formatter
Format, minify and validate JSON. Instant syntax error detection with line/column info.
JSON
Validator
Regex Tester
Live regex match highlighting with flag support (g, i, m, s) and captured groups display.
Regex
Pattern
Base64 Encoder / Decoder
Encode or decode Base64 instantly in your browser. Full UTF-8 support.
Base64
Encoding
Hash Generator
Generate SHA-1, SHA-256 and SHA-512 hashes using the browser Web Crypto API.
SHA-256
Crypto
JWT Decoder
Decode JWT tokens and inspect header, payload and expiry status — no data leaves your browser.
JWT
Auth