Free Developer Tools
for Modern Developers
Fast, free, and secure developer utilities. Format JSON, generate UUIDs, decode JWTs, create hashes, and build cron expressions - all in your browser.
Developer Tools
Essential utilities for every developer
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting and error detection.
UUID Generator
Generate UUIDs v1 and v4 instantly. Batch generation with uppercase/lowercase options.
JWT Decoder
Decode JWT tokens and inspect header, payload, and expiration status instantly.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for any text input.
Cron Generator
Build cron expressions visually with presets and human-readable descriptions.
Why Choose DevTools?
Built for developers, by developers
Lightning Fast
All tools run locally in your browser for instant results with no server delays.
Privacy First
Your data never leaves your device. No tracking, no logs, no data collection.
Mobile Friendly
Fully responsive design works perfectly on desktop, tablet, and mobile devices.
100% Free
No signup required. No premium features. All tools are completely free to use.