JWT Decoder & Token Parser
Decode JSON Web Tokens instantly to inspect header claims, payload JSON data, and signature info right in your browser.
🔑 Encoded JWT Token Input
🔍 Decoded Output Payload
🚀 100% Client-Side Decoded. Your tokens are completely private.
How JWT Decoder Works
1
Paste JWT String
Paste any encoded JSON Web Token into the input textarea box on the left.
2
Client-Side Parsing
The tool instantly parses Base64URL encoded header and payload parts directly inside your web browser.
3
Inspect Claims
View formatted JSON data including user credentials, expiration timestamps, and issuer details safely.
Frequently Asked Questions
1. Is my secret token data secure?
Yes, absolutely! The decoding happens entirely within your browser using JavaScript. No tokens are transmitted or saved to external servers.
2. What are the three parts of a JWT token?
A JWT consists of three dot-separated parts: 1) Header (defines algorithm & token type), 2) Payload (contains user data & claims), and 3) Signature (verifies token authenticity).