JWT Decoder & Validator

Decode, analyze, and validate JSON Web Tokens

What is a JSON Web Token (JWT)?

A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. JWTs are commonly used for:

  • Authentication: After login, a JWT is issued and sent with each request to prove identity
  • Authorization: JWTs contain claims (roles, permissions) that determine access rights
  • Information Exchange: Signed JWTs ensure data integrity and authenticity
  • Single Sign-On (SSO): JWTs enable seamless authentication across multiple services

Structure: A JWT has 3 parts separated by dots: Header.Payload.Signature

Security Warning: Never share production JWTs. They may contain sensitive information and grant access to systems.

Try samples:
Standard JWT Claims Reference
iss

Issuer - who created the token

sub

Subject - who the token represents

aud

Audience - intended recipient

exp

Expiration - when token expires

nbf

Not Before - when token becomes valid

iat

Issued At - when token was created

jti

JWT ID - unique token identifier