T
Hndy Tools

JWT Decoder with Log History

Decode JWT tokens with interactive JSON viewer and browser-based history log

JWT
Security
Decoder
JSON
Development

No decode history yet.

Successfully decoded JWTs will appear here.

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No JWT Decoded Yet

Enter a JWT token in the input field and click "Decode JWT" to see the decoded results here.

â–  Header â–  Payload â–  Signature

About JWT Decoder with Log History

What is JWT?

JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. JWTs are commonly used for authentication and information exchange in web applications.

JWT Structure

  • Header: Contains token type and signing algorithm
  • Payload: Contains claims (user data, permissions, etc.)
  • Signature: Verifies token integrity and authenticity

History Feature

Successfully decoded JWTs are automatically saved to your browser's local storage. You can revisit previous tokens, compare different JWTs, and manage your decode history.

Privacy & Security

All JWT decoding happens in your browser. No tokens are sent to our servers. History is stored locally in your browser and can be cleared at any time.

Frequently Asked Questions (FAQ)

What is a JWT token?
JWT (JSON Web Token) 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?
No, this tool only decodes the JWT structure. Signature verification requires the secret key or public key used to sign the token, which should never be shared publicly.
Is my JWT data secure?
Yes, all JWT decoding happens locally in your browser. No tokens are transmitted to any servers. Your decode history is stored only in your browser's local storage.
How long is the decode history kept?
The history is stored in your browser's local storage and persists until you clear it manually or clear your browser data. We keep the last 50 successful decodes.
What if my JWT token is invalid?
Invalid JWT tokens will show an error message explaining the issue. Only successfully decoded tokens are added to the history log.
Can I export my decode history?
Currently, the history is stored locally in your browser. You can copy individual tokens or decoded data using the copy buttons provided.
What JWT claims are commonly used?
Common JWT claims include: sub (subject), iss (issuer), aud (audience), exp (expiration), iat (issued at), nbf (not before), and custom claims specific to your application.
Why use JWT tokens?
JWTs are stateless, compact, and can carry user information without requiring database lookups. They're widely used for authentication, authorization, and secure information exchange.