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A signed JSON token often used to carry authentication or authorization claims.
JWTs can prove that a server issued a set of claims, but they are easy to misuse. Validate signatures, expiry, issuer, audience, and storage strategy.
Plainly
Think of JWT as the lock and rules that keep people and data safe. A signed JSON token often used to carry authentication or authorization claims.
In practice
Use it when a workflow touches secrets, permissions, user data, payments, or untrusted input. In practice, define the owner, input, output, and failure mode before you rely on it.