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PHP
Build & Sign a JWT (HS256)
Generate a JWT manually using only base64-url and hash_hmac — no library required. Demonstrates header/payload/signature concatenation and the exp claim.
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PHP
Verify a JWT (HS256)
Pair to jwtSign: verify the signature, check the exp claim, and return the decoded payload — or null on any failure. Uses hash_equals for constant-time signature comparison.
Python
JWT Sign + Verify (PyJWT)
The de-facto JWT library for Python. HS256 demo with an exp claim and the standard "verify everything" decode flow. Mind that PyJWT raises specific exceptions you can catch separately.