JWT Parser
Decode and verify JSON Web Tokens (JWT) instantly. All processing done in your browser for maximum security and privacy.
Header
Payload
Signature
Signing Algorithm
Invalid Token Structure
How to Use JWT Parser
Decode and analyze your JSON Web Tokens in three simple steps
Paste Your Token
Copy and paste your JWT into the input field above
Instant Decode
The token is automatically decoded to show header, payload, and signature
Analyze
Review the decoded information and check token validity
What is a JWT?
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.
JWT Structure
A JWT consists of three parts separated by dots:
Header
Contains metadata about the token, such as the algorithm used for signing
Payload
Contains the claims or statements about an entity and additional metadata
Signature
Used to verify that the sender of the JWT is who it says it is and to ensure the message wasn't changed
Frequently Asked Questions
Is it safe to decode JWTs online?
Yes, when using this tool. All processing is done 100% in your browser. Your tokens are never sent to any server. However, be cautious with other online tools that may send your tokens to their servers.
What makes a JWT expired?
A JWT is expired when the current time exceeds the "exp" (expiration) claim in the payload. This tool shows you if a token is expired, active, or not yet valid based on these time claims.
Should I include sensitive data in JWT?
No! JWT payload is base64 encoded, not encrypted. Anyone can decode and read the contents. Never include passwords, API keys, or other sensitive information in a JWT.