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. This information can be verified and trusted, as it is digitally signed.
It is a method to implement authorization in the application
It is a token that only the server can generate, and can contain a payload of data.
JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA or ECDSA.
Signed tokens can verify the integrity of the claims contained within it, while encrypted tokens hide those claims from other parties
A JWT payload can contain things like user ID so that when the client sends you a JWT, you can be sure that it is issued by you, and you can see to whom it was issued.
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