JWT Parser & Debugger

Decode and verify JSON Web Tokens (JWT). Inspect header, payload, and signature. Free online JWT parser with expiration checking.

Encoded JWT

Header

Paste a JWT token above to see the decoded header

Payload

Paste a JWT token above to see the decoded payload

Signature

Paste a JWT token above to see the signature

Note: Signature verification requires the secret key and is not performed in this client-side tool for security reasons.

What is JWT?

JSON Web Tokens are a compact, URL-safe means of representing claims to be transferred between two parties. Commonly used for authentication.

JWT Structure

JWTs consist of three parts separated by dots: Header (algorithm & token type), Payload (claims), and Signature (verify authenticity).

Security Note

Never share your JWT tokens publicly. They contain sensitive information and can grant access to protected resources. This tool runs entirely in your browser.