Fast, private developer tools.
Essential tools for JSON, Base64, JWT, URLs, timestamps, hashes, UUIDs and regex — right in your browser.
Developer tools
Data & JSON
JSON Formatter
Beautify, minify and validate JSON instantly as you type.
- Live validation
- Syntax highlighting
- Sort keys
- Copy & download
Base64 Encoder/Decoder
Convert text to Base64 and back, with full Unicode support.
- Live conversion
- URL-safe option
- Emoji & Unicode safe
Web & APIs
JWT Decoder
Decode JSON Web Tokens to inspect the header, payload and expiry.
- Header & payload
- Readable claims
- Expiry check
Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps.
- Live Unix time
- Auto-detect s / ms
- UTC & local
URL Encoder/Decoder
Percent-encode and decode URLs, and break down query strings.
- Component or full URL
- Query params table
- Live conversion
Security & Cryptography
Development
Why DevNest
Private by design
Every tool runs in your browser. What you paste or type isn't uploaded or stored.
Instant results
Input is processed directly in the browser, so results update as you type.
No sign-up
Use DevNest without creating an account.