JWT claims

JSON Web Tokens (JWTs) are a secure communication standard used primarily for user access management, enabling clients and servers to exchange information compactly through a self-contained JSON object. JWTs consist of a header, payload, and signature, with the payload containing claims that convey information such as user identity and permissions. JWT claims are categorized into registered, public, and private types, each serving different purposes, such as standardized claims for interoperability or custom claims for specific user data. While registered claims are universally recognized, developers can create custom claims—either public, registered with the IANA registry, or private for local agreements—to include additional user information like metadata. Care must be taken to avoid naming collisions with registered claims to ensure proper data conveyance. The article also mentions Stytch as a tool for managing user access with JWTs, offering features like short expiration times and automatic API fallbacks.

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