Developer Tools
JSON Formatter
Format, validate, and beautify your JSON data
Base64 Encoder/Decoder
Encode and decode Base64 strings with full Unicode support
URL Encoder/Decoder
Encode or decode URL components for safe use in web addresses
HTML Escape/Unescape
Escape or unescape HTML special characters like <, >, &, and quotes
UUID Generator
Generate random UUID v4 identifiers for use in databases, APIs, and more
JWT Decoder
Decode and inspect JSON Web Tokens to view header, payload, and expiration status
Regex Tester
Test regular expressions with live matching, highlighting, and captured groups
Cron Expression Generator
Build and understand cron expressions with an interactive visual editor
Markdown Preview
Write Markdown and see a live rendered HTML preview side by side
YAML / JSON Converter
Convert between YAML and JSON formats quickly and easily
REST API Client
Send HTTP requests and inspect responses — a lightweight Postman alternative in your browser
WebSocket Client
Connect to WebSocket servers, send and receive messages in real-time — test your WebSocket APIs in the browser