JWT Token Parser & Decoder
Decode and parse JWT tokens safely. View header, payload, and signature details. Perfect for debugging authentication and API tokens.
Understanding JWT Tokens
What is JWT?
JSON Web Token (JWT) is a secure way to transmit information between parties as a JSON object. JWTs are commonly used for authentication and authorization in web applications and APIs.
JWT Structure
- • Header: Contains token type and signing algorithm
- • Payload: Contains claims and user data
- • Signature: Ensures token integrity
Common Use Cases
- • Debug authentication issues
- • Verify token expiration
- • Check user permissions
- • Understand token structure
- • Validate API responses
- • Security auditing
Security Notice
All JWT decoding happens locally in your browser. No tokens are sent to our servers, ensuring your sensitive data remains private and secure.
Frequently Asked Questions
Is it safe to paste JWT tokens here?
Yes, it's completely safe. All JWT decoding happens locally in your browser. No tokens are transmitted to our servers, ensuring your sensitive authentication data remains private.
Can this tool verify JWT signatures?
Our tool can decode JWT tokens and display signature information, but signature verification requires the secret key. For security reasons, never paste secret keys into online tools.
What information can I see in a decoded JWT?
You can view the header (algorithm, token type), payload (claims, user data, expiration), and signature details. The tool also highlights token expiration status.
Why does my JWT token show as expired?
JWT tokens have an expiration time (exp claim). If the current time is past the expiration time, the token is considered expired and should not be used for authentication.
Can I decode JWT tokens from any provider?
Yes, our tool can decode standard JWT tokens from any provider that follows RFC 7519 specifications, including tokens from Auth0, Firebase, AWS Cognito, and custom implementations.