JWT Decoder & Inspector

What is a JWT token?

A JSON Web Token (JWT) is a compact, URL-safe means of representing claims between two parties. It consists of three Base64URL-encoded parts separated by dots: a header, a payload, and a signature. JWTs are commonly used for authentication and authorization in web applications.

Is it safe to decode JWT tokens online?

Yes, with SpeedyTools. Our JWT decoder runs entirely in your browser. Your token is never sent to any server, so your sensitive authentication data stays private and secure on your device.

Can this tool verify JWT signatures?

This tool decodes and inspects JWT tokens but does not verify signatures. Signature verification requires the secret key or public key used to sign the token, which should never be shared with a client-side tool.

How do I check if a JWT token is expired?

Paste your JWT token into the decoder and look at the expiration status indicator. The tool automatically reads the 'exp' claim from the payload and compares it to the current time to show whether the token is valid, expired, or has no expiration claim.

What are the three parts of a JWT?

A JWT consists of three parts separated by dots: the Header (specifies the signing algorithm and token type), the Payload (contains the claims such as user ID, roles, and expiration), and the Signature (used to verify the token has not been tampered with).