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JWT Decoder
Runs in your browserInput
Output
Ready โ zero server calls
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How to Use
- Paste a JWT token (the long string with two dots) into the input field.
- The decoder instantly shows the header and payload as formatted JSON.
- Review claims like expiration, issuer, and roles. Timestamps are shown as human-readable dates.
What is a JWT Token?
JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. JWTs are widely used for authentication and authorization in web applications, APIs, and single sign-on (SSO) systems.
How JWT Decoding Works
A JWT consists of three parts separated by dots: Header, Payload, and Signature. The header and payload are Base64URL-encoded JSON รขยย they're not encrypted, just encoded. This means anyone can read the contents without the secret key. Our decoder splits the token, decodes each part, and displays the structured JSON with syntax highlighting. It also shows human-readable timestamps for standard claims like 'exp' (expiration), 'iat' (issued at), and 'nbf' (not before).