JWT Decoder

What is a JWT Decoder?

A JWT (JSON Web Token) decoder inspects the contents of a JWT without verifying its signature. JWTs are commonly used for authentication and information exchange.

How to Use This Tool

Paste your JWT token and the tool instantly decodes it to show the header, payload (claims), and signature sections.

JWT Structure

JWTs have three parts separated by dots: header.payload.signature

• Header: Algorithm and token type
• Payload: Claims/data being transmitted
• Signature: Verifies token authenticity

Common Claims

• iss: Issuer
• sub: Subject (user)
• exp: Expiration time
• iat: Issued at

FAQ

Is it safe to decode JWTs?
Decoding is safe. However, never trust payload data without verifying the signature.