Free Developer Tools
JSON formatter, JWT decoder, hash generator, and more
100% client-side - your code never leaves your browser
About Developer Tools
Our developer tools are built for programmers, DevOps engineers, and anyone working with data formats and security. Format JSON, decode JWTs, generate hashes, create UUIDs, and test regex patterns — all without leaving your browser.
Every tool processes data locally using JavaScript, ensuring your sensitive information like API tokens, configuration files, and development credentials never leave your machine. Perfect for working with confidential or proprietary data.
JSON Formatter
Format, validate, and minify JSON data. Instantly beautify or compress JSON with syntax highlighting.
JWT Decoder
Decode JWT tokens and inspect header and payload. View token claims and expiration instantly.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes. Secure one-way hash generation for any text input.
UUID Generator
Generate UUID v4 identifiers instantly. Create unique IDs for database keys, session tokens, and more.
Regex Tester
Test and debug regular expressions with real-time matching. Highlight matches and test patterns instantly.
Cron Expression Generator
Generate and parse cron expressions with human-readable descriptions. Visual builder for scheduling tasks.
Base64 Encoder/Decoder
Encode and decode Base64 strings. Convert text to Base64 and back with support for UTF-8.
URL Encoder/Decoder
Encode and decode URL strings. Convert special characters for safe URL transmission.
Color Picker
Pick and convert colors between HEX, RGB, HSL formats. Get color codes for web design.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports multiple date formats.
Markdown Preview
Preview Markdown in real-time. Write and render Markdown with syntax highlighting.