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What is JWT?

Pragya Keshap answered on November 12, 2022 Popularity 10/10 Helpfulness 2/10

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  • What is JWT?

    3

    JWT (JSON Web Tokens) are tokens that are generated by a server upon user authentication in a web application and are then sent to the client (normally a browser). As a result, these tokens are sent on every HTTP request, allowing the server to verify or authenticate the user's identity. This method is used for authorizing transactions or requests between client and server. The use of JWT does not intend to hide data, but rather ensure its authenticity. JWTs are signed and encoded, instead of encrypted. A cryptographic algorithm is used to digitally sign JWTs in order to ensure that they cannot be altered after they are issued. Information contained in the token is signed by the server's private key in order to ensure integrity.

    Login credentials are sent by the user. When successful, JWT tokens (signed by private key/secret key) are sent back by the server to the client.

    The client takes JWT and inserts it in the Authorization header to make data requests for the user.

    Upon receiving the token from the client, the server simply needs to compare the signature sent by the client to the one it generated with its private key/secret key. The token will be valid once the signatures match.

    Three parts make up JSON Web Tokens, separated by a dot (.). The first two (the header and the payload) contain Base64-URL encoded JSON, while the third is a cryptographic signature.  

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    Contributed on Feb 24 2023
    Pragya Keshap
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