Developer

JWTDecoder

Decode and debug JSON Web Tokens instantly. Inspect header, payload, and verify expiration.

Input JWT Token

Waiting for Token

Decodes JWT headers and payloads instantly. No data is sent to our servers.

JWT Structure

A JWT (JSON Web Token) has three parts separated by dots: header.payload.signature

Header

Algorithm and token type

{"alg": "HS256"}

Payload

Claims data

{"sub": "123"}

Signature

Verify integrity

HMACSHA256(...)

Common Claims

iss

Issuer

sub

Subject (user ID)

aud

Audience

exp

Expiration time

iat

Issued at

nbf

Not before