如何进行JSON Web Token 入门

JSON Web Token (JWT) is a standard for creating access tokens that assert a series of claims. These claims can be verified and trusted because they are digitally signed. JWTs can be used as authorization tokens to access API endpoints or as ID tokens to authenticate users.

A JWT consists of three parts: a header, a payload, and a signature. The header typically consists of two parts: the type of the token, which is JWT, and the signing algorithm being used, such as HMAC SHA256 or RSA.

The payload is where the claims are stored. These claims can be anything that is JSON-encodable. The most common claims are ones that assert a user's identity, such as name, email, and birth date.

The signature is used to verify that the token has not been tampered with. It is created by signing the header and payload with a secret key.

JWTs can be used in a variety of ways. They can be used as bearer tokens to authenticate users. They can also be used as ID tokens to assert a user's identity.

JWTs are typically transmitted in the Authorization header of an HTTP request. The format is as follows:

Authorization: Bearer

where is the JWT.

JWTs can also be transmitted in the body of an HTTP request or in a URL parameter.

When a JWT is used as an authorization token, the claims in the JWT are used to determine what the user is allowed to do. For example, if a JWT contains a claim that the user is allowed to read articles, then the user will be able to read articles.

JWTs can also be used as ID tokens. In this case, the claims in the JWT are used to assert the user's identity. For example, if a JWT contains a claim that the user's email is example@example.com, then the user's email is example@example.com.

JWTs can be used in a variety of other ways as well. For example, they can be used to secure cookies.

To learn more about JWTs, check out the following resources:

- https://jwt.io/

- https://auth0.com/learn/json-web-tokens/