JWT Decoder

JWT (JSON Web Token) is an open standard (RFC 7519) for securely transmitting information between parties as a compact JSON object. A token consists of three parts separated by dots: Header (signing algorithm), Payload (data claims), and Signature.

How JWT Works Header and Payload are encoded in base64url and are not encrypted — anyone can read them. The Signature is created from the Header, Payload, and a secret key, allowing token authenticity verification. JWT is widely used for authentication in web applications (OAuth 2.0, OpenID Connect) and inter-service authorization in microservice architectures.

JWT Token

Header

Payload

Timestamps

Signature

Free online JWT (JSON Web Token) decoder. JWT is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. A token consists of three parts separated by dots: Header, Payload, and Signature.

Paste a token and instantly see its contents: the header with signing algorithm information (HS256, RS256, etc.), the payload with user data (claims), and the signature. The tool automatically decodes base64url encoding and formats JSON for easy reading. For tokens with an exp field, expiration status is shown — already expired or remaining time in hours and minutes. The iat field is displayed as a human-readable issue date.

All computations are performed locally in the browser — your token is never transmitted or stored. An essential tool for developers working with OAuth 2.0, OpenID Connect, authentication, and JWT-based authorization in web applications and microservices.