Unless In secure communication, a token can be stolen and misused.Can't easily revoke an access token, so they normally are granted with short expiry and the revocation is handled at the refresh token.Authorization can happen on the resource server, or easily separated into its own server Decoupled/Decentralized - The token can be generated anywhere.ideal in micro service environment with 2/3 legged token Portable - A single token can be used with multiple backends.JWT supports varius algoriths that supports public/private key pair, symmetrically signed, so on More secure -Even though it can be read by anybody but it can not be tampered.More compact - As JSON is less verbose than XML so when encoded it's more compact as compaired to simple web tokens (SWTs) and Security Assertion Markup Language (SAML) tokens.Supports scaling - As no session tracked, single point of failure (SPOF) of 'shared session cache' / session affinity avoided in multiple server instance.No Session to Manage (stateless) - JWT is a self-contained token (and gets stored at client side,) server does not need to keeps track of it.No backend store - As server encodes all the data about the grant into the token itself, No data stored at server except secret.The signature is calculated by encoding the header and payload using Base64url Encoding and concatenating the two together with a period separator Standard fields ("claims") : Issuer ( iss), Subject ( sub), Audience ( aud), Expiration Time ( exp), Not Before ( nbf), Issued at ( iat), JWT ID ( jti) This example has the standard Issued At Time claim ( iat) and a custom claim ( loggedInAs). The JWT specification defines seven Registered Claim Names which are the standard fields commonly included in tokens. Standard fields : Token type ( typ), Content type ( cty), Message authentication code algorithm ( alg), Key ID ( kid), x.509 Certificate Chain ( x5c), x.509 Certificate Chain URL ( x5u), Critical ( crit)Ĭontains a set of claims. HS256 indicates that this token is signed using HMAC-SHA256. ![]() Identifies which algorithm is used to generate the signature
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