Free Developer Tools
JSON formatting, URL encoding, JWT decoding, regex testing, and more. No signup required. Use in your browser or integrate via API.
JSON Formatter & Validator
Format, validate, and analyze JSON with smart auto-fix for common issues. Sort keys, adjust indentation, and get detailed stats.
POST /api/v1/tools/json-formatURL Encoder / Decoder
Encode or decode URLs and query parameters with full component breakdown. Supports encodeURIComponent and decodeURIComponent.
POST /api/v1/tools/url-encodeBase64 Encoder / Decoder
Encode or decode Base64 in standard or URL-safe variants. Perfect for data URIs, JWTs, and binary-safe text encoding.
POST /api/v1/tools/base64JWT Decoder
Decode and inspect JSON Web Tokens instantly. View header, payload, signature, expiration status, and registered claims.
POST /api/v1/tools/jwt-decodeRegex Tester
Test regular expressions with real-time match highlighting, group capture display, and flag configuration.
POST /api/v1/tools/regex-testUUID / GUID Generator
Generate UUIDs v4 and v7. Bulk generation up to 100, uppercase/lowercase, with or without dashes.
POST /api/v1/tools/uuid-generateHTTP Status Codes Reference
Complete reference for all HTTP status codes with descriptions, common causes, and troubleshooting tips.
Cron Expression Generator
Generate and explain cron expressions with human-readable descriptions and next run time previews.
POST /api/v1/tools/cron-explainUser Agent Parser
Parse any user agent string to extract browser, OS, device type, and rendering engine. Detects bots and mobile devices.
POST /api/v1/tools/parse-user-agentrobots.txt Generator & Tester
Generate robots.txt files with rule builder and presets. Test if URLs are allowed or blocked by any robots.txt.
POST /api/v1/tools/robots-txt-generateColor Picker & Converter
Convert colors between HEX, RGB, HSL formats. Generate palettes and check WCAG contrast ratios for accessibility.
POST /api/v1/tools/color-convertFree API Access
All tools are available via free API endpoints — no authentication required. Each endpoint accepts a POST request with a JSON body and returns processed results. Perfect for AI agents, scripts, and automation. Check each tool page for usage examples in curl, Python, and JavaScript.