JWT Decoder

Decode and inspect JSON Web Tokens

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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 authorization in web applications.

A JWT consists of three parts separated by dots (.):

  • Header: Algorithm and token type
  • Payload: Claims (user data, expiration, etc.)
  • Signature: Verification hash

How to Use

  1. Paste your JWT token into the input area
  2. View the decoded header and payload with color-coded sections
  3. Check expiration status and claims

Frequently Asked Questions

What is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts: header, payload, and signature, separated by dots.

Can this tool verify JWT signatures?

This tool decodes and displays the JWT contents but doesn't verify signatures, as that requires the secret key or public key which should never be shared in a browser.

Is my JWT safe to paste here?

Yes. All decoding happens in your browser. The JWT is never sent to any server. However, be cautious with production tokens as they may contain sensitive claims.