JWT Decoder
Decode and verify JSON Web Tokens
How to Use
Paste JWT Token
Copy and paste your JWT token into the input area. A valid JWT consists of three Base64-encoded parts separated by dots.
Decode Token
Click the "Decode" button to parse the token. The tool will display the header, payload, and signature separately.
View Information
Check the token status, issue time, expiration time, and remaining validity. Claims like "exp" (expiration) and "iat" (issued at) are automatically parsed.
Copy Results
Use the copy buttons to quickly copy the header or payload JSON to your clipboard.
JWT Structure
Header
Contains the algorithm (alg) and token type (typ). Common algorithms include HS256, RS256, ES256.
Payload
Contains claims (user data). Registered claims: iss (issuer), sub (subject), aud (audience), exp (expiration), nbf (not before), iat (issued at), jti (JWT ID).
Signature
Created by signing the header and payload with a secret or private key. Used to verify the token's integrity.