This is created from the encoded header, encoded payload, algorithm in the header and a secret key. Iss - issuer is used to identify the issuer of the the JWT. The most widely used claims are iss, exp and sub. In JWT, there are 3 main types of claims - registered, public and private. It contains claims, which are statements/fields about an entity and any additional data. In the example, in next sections, for the user service from ACME Shop app, I will be using 2 keys, one for access_token and another one for refresh_token. This is particularly useful when there are multiple keys used to sign different kinds of tokens within your application and have to look up the right one to verify the signature. The header can also hold an additional information like “kid”. It is Base64 encoded to form the first part of the JWT. It contains information about the alogirthm used to generate the signature. So it’s always best practice to use HTTPS with JWT. NOTE: JWT assures data ownership and not encryption. It’s an encoded string that can contain any amount of data and it is cryptographically signed (by the server side). It’s one of the most popular ways of authentication. JSON Web Token (JWT) is an open standard ( RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. It has a small overhead and it works across different domains. This is where JWT comes into the picture. The signature is added to the result in the same way (encoded and separated by a dot).Authorization decides whether a particular user/service is allowed access to a particular route, service or resource.
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