Stands for “JSON Web Token.”

A JWT is an industry-standard token that shares safety data between two events. JWTs are compact and URL-safe, which permits net servers and shoppers to alternate them as a part of an HTTPS request. The most typical use for a JWT is for authenticating a person signed in to a web site or net app, usually via a single sign-on (SSO) service.

JWTs encompass three components:

  • The header consists of details about the kind of token and the algorithm used to generate the signature.
  • The payload consists of the checklist of claims made by the token. These claims sometimes embrace details about the token issuer, the web site or net app using the token, and the person. They additionally embrace the time the token was issued and when it can expire (each using epoch time). In addition to those widespread values, a JWT might embrace arbitrary claims distinctive to the web site or net app issuing the token.
  • The signature verifies that the token hasn’t been tampered with since being issued.

Websites and net apps usually use JWTs as a stateless technique of authenticating a person. They don’t require that the server keep a session in its reminiscence or database, which reduces the overhead required for every person. Instead, the shopper and server commerce the JWT backwards and forwards with every HTTPS request, verifying the signature to make sure the token hasn’t been altered. Once the JWT expires, the person should signal back in for a brand new one to be issued.

Creating a JWT

Both the header and the payload of a JWT encompass textual content written in JSON. The header and payload are every encoded individually using an algorithm known as base64, turning a number of traces of textual content right into a single string. The encoded header and payload strings are mixed, separated by a ‘.’ character.

The header and payload are encoded and combined into a string, which is hashed and used as the signature
The header and payload are encoded and mixed right into a string, which is hashed and used because the signature

The mixed string, containing the encoded header and payload, is encoded as soon as once more using a hash algorithm and a secret key to create the signature. The signature is then appended to the tip of the header and payload, separated by one other ‘.’ character, to create the ultimate JWT.

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