What is claim in authorization?

Claims are pieces of information about a user that have been packaged, signed into security tokens and sent by an issuer or identity provider to relying party applications through a security token service (STS) .

Claim based authorization checks are declarative – the developer embeds them within their code, against a controller or an action within a controller, specifying claims which the current user must possess, and optionally the value the claim must hold to access the requested resource.

JSON web tokens (JWTs) claims are pieces of information asserted about a subject . For example, an ID token (which is always a JWT) can contain a claim called name that asserts that the name of the user authenticating is “John Doe”.

Claim is piece of information that describes given identity on some aspect. Take claim as name-value pair.