JWT Token Decoder

Paste your JWT token below to decode and inspect its header, payload, and signature. All processing happens in your browser - tokens are never sent to any server.

JWT Token:

About JWT Tokens

JWT (JSON Web Token) is a compact and self-contained way to transmit information securely between parties as a JSON object. JWTs are commonly used for authentication and authorization in web applications and APIs.

JWT Structure

A JWT consists of three parts separated by dots (.):

Header: Contains the token type (JWT) and signing algorithm (e.g., HS256, RS256)
Payload: Contains the claims (statements about the user and additional data)
Signature: Used to verify the token hasn't been tampered with

Common Claims

iss (Issuer) - Who created and signed the token
sub (Subject) - The subject of the token (usually user ID)
aud (Audience) - Who the token is intended for
exp (Expiration) - When the token expires (Unix timestamp)
iat (Issued At) - When the token was created (Unix timestamp)
nbf (Not Before) - Token not valid before this time (Unix timestamp)
jti (JWT ID) - Unique identifier for the token

Use Cases

Authentication: User login and session management
Single Sign-On (SSO): Authenticate across multiple applications
API Authorization: Secure API endpoints and microservices
Information Exchange: Securely transmit data between systems
Mobile Apps: Authenticate without storing credentials

Security Note: JWTs are signed but not encrypted by default. Don't put sensitive information in the payload unless you're using JWE (JSON Web Encryption). Always verify tokens on the server-side.

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