JWT Decoder
Decode and inspect JSON Web Tokens (JWT). View header, payload, and signature. Validate JWT structure and expiration. Essential tool for API development and authentication debugging.
What is JWT?
JSON Web Token (JWT) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange.
JWT Structure:
- Header: Contains the token type (JWT) and signing algorithm
- Payload: Contains the claims (data) like user ID, expiration, etc.
- Signature: Used to verify the token hasn't been tampered with
⚠️ Security Note:
This tool only decodes JWTs. It does not validate signatures. Never trust decoded JWT data without proper signature verification on your server.
How to Use JWT Decoder
Paste JWT
Enter your JWT token
Decode
View decoded parts
Inspect
Check header and payload
Verify
See expiration and claims
Features
Privacy First
All processing happens in your browser
Instant Download
Download processed images immediately
Mobile Friendly
Works on all devices
Frequently Asked Questions
Q:Does it verify signatures?
Q:Is it safe to decode JWTs here?
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Why Choose Our JWT Decoder?
Our tool is completely free, requires no registration, and processes everything in your browser for maximum privacy and speed. No file size limits, no watermarks, just pure functionality.
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