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JWT Token Decoder

Decode and inspect JSON Web Tokens (JWT). View header, payload, and verify signatures.

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Header HEADER
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Payload PAYLOAD
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Signature SIGNATURE
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Features

Token Inspection

View decoded header and payload data in a formatted way.

Expiry Check

Automatically check token expiration status.

JSON Formatting

Pretty-print JSON data for better readability.

Client-Side

All processing happens in your browser for security.

JWT Token Decoder Tool

Our free online JWT decoder allows you to parse and inspect JSON Web Tokens (JWTs) instantly. This essential tool for developers helps you view the contents of any JWT token, including its header, payload, and signature components.

What is a JWT Token?

A 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 - As access tokens in OAuth and OpenID Connect flows
  • Information Exchange - Securely transmitting data between services
  • Session Management - Maintaining user sessions in web applications

JWT Structure

Every JWT consists of three parts separated by dots:

  1. Header - Contains token type and signing algorithm
  2. Payload - Contains the claims (statements about an entity)
  3. Signature - Used to verify the token hasn't been altered

A typical JWT looks like: xxxxx.yyyyy.zzzzz

Common JWT Claims

Standard claims you'll often find in JWT payloads:

  • iss (Issuer) - Who issued the token
  • sub (Subject) - Who the token represents
  • aud (Audience) - Who the token is intended for
  • exp (Expiration) - When the token expires
  • iat (Issued At) - When the token was issued

How to Use This JWT Decoder

  1. Paste your JWT token in the input box above
  2. The tool will automatically decode and display the header and payload
  3. View the signature (note: signature verification requires the secret key)
  4. Check the token expiration status (if exp claim is present)

Security Considerations

  • This tool processes tokens entirely in your browser - your tokens never leave your device
  • For sensitive tokens, consider using offline tools
  • Never share valid tokens containing sensitive information
  • This tool only decodes tokens - it doesn't verify signatures without the secret key

Frequently Asked Questions

Q: Can this tool verify JWT signatures?
A: No, this is a decoder only. Signature verification requires the secret key which should never be entered in a web tool.

Q: What's the difference between JWT and JWS?
A: JWT is the token format, while JWS (JSON Web Signature) is the mechanism for signing JWTs.

Q: Are my tokens stored anywhere?
A: No, all processing happens in your browser and no data is sent to any server.

Q: Why can't I see all the claims in my token?
A: Some tokens may be encrypted (JWE) rather than just signed. This tool only works with unencrypted JWTs.