JWT Decoder
JWT tokens are stored in localStorage for convenience. or

JWT Decoder

Need to sign a token? JWT Encoder →
JWT Token 0 chars

What is JWT?

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange in modern web applications.

How to Use JWT Decoder

  1. Paste your JWT - Copy and paste your complete JWT token into the input field
  2. View decoded data - The header and payload are automatically decoded and displayed
  3. Inspect claims - Review the token's claims, expiration, issuer, and other data
  4. Copy parts - Copy the decoded header or payload separately

JWT Decoder Features

  • Header decoding - View the algorithm and token type
  • Payload inspection - See all claims including custom data
  • JSON formatting - Pretty-printed, readable output
  • Real-time decoding - Instant results as you type
  • Error detection - Identifies malformed tokens
  • One-click copy - Copy decoded sections easily

Frequently Asked Questions

Is it safe to paste my JWT here?

Yes, all decoding happens in your browser. Your JWT is never sent to any server. However, never share JWTs containing sensitive production data in any online tool.

What are the three parts of a JWT?

A JWT consists of three parts separated by dots: Header (algorithm and type), Payload (claims and data), and Signature (verification). The tool decodes the header and payload which are Base64Url encoded.

Can this tool verify the signature?

This tool decodes the header and payload for inspection but does not verify signatures. Signature verification requires the secret key or public key, which should only be done in secure server environments.