JWT Encoder & Decoder

What is a JWT?

JWT (JSON Web Token) is a compact token format commonly used for authentication, APIs and secure data exchange between systems. JWTs contain a header, payload and signature encoded using Base64Url.

JWT Structure

• Header — token type and signing algorithm
• Payload — claims and application data
• Signature — token verification component

Common JWT Claims

• sub — subject identifier
• exp — expiration timestamp
• iat — issued at timestamp
• iss — token issuer
• aud — intended audience