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Developer Utilities

JWT Decoder & Inspector

Decode JSON Web Tokens (JWT) header, payload claims, and expiration dates instantly in browser memory.

100% Client-Side JWT Parser (Zero Key Leaks)
Token Validation StatusValid (expires on 9/21/2030, 9:37:02 AM)
Paste JWT Token String
Header (Algorithm & Type)
{
  "alg": "HS256",
  "typ": "JWT"
}
Payload Claims
{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022,
  "exp": 1916239022
}

What is a JWT Decoder?

JWT Anatomy

JWT ComponentDescription
HeaderContains token type and signing algorithm (e.g. HS256, RS256).
Payload ClaimsContains user claims, issue timestamp (`iat`), and expiration date (`exp`).
SignatureVerifies message integrity using secret keys or public key pairs.

Frequently Asked Questions (AEO)

Is my secret key transmitted over the network?
No. Decoding happens 100% locally in client-side JavaScript. Your tokens and secret keys are never transmitted to any external server.
What parts of a JWT token are decoded?
The decoder parses the JOSE Header (algorithm), Payload Claims (user ID, expiration, roles), and Signature component.

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