Verify JWT Signatures by Language
Production JWT verification code for every major language: sign, verify with claim validation, and verify against a JWKS endpoint.
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Node.js
Verify JWT in Node.js with jsonwebtoken and jose. Sign and verify HS256/RS256, validate iss/aud/exp, and verify against a JWKS endpoint with full code examples.
jsonwebtoken, jose
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Python
Verify JWT in Python with PyJWT and Django SimpleJWT. Sign and verify HS256/RS256, validate iss/aud/exp, verify against JWKS, and protect FastAPI routes.
PyJWT, Django SimpleJWT, FastAPI
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Java
Verify JWT in Java with Spring Security OAuth2 Resource Server and jjwt. Sign and verify RS256, validate claims, verify against JWKS, and fix common Spring Security errors.
Spring Security, jjwt
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Go
Verify JWT in Go with golang-jwt and go-jose. Sign and verify HS256/RS256, validate iss/aud/exp, and verify against a JWKS endpoint with full code examples.
golang-jwt, go-jose
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PHP
Verify JWT in PHP with firebase/php-jwt and Laravel Sanctum. Sign and verify HS256/RS256, validate iss/aud/exp, and verify against a JWKS endpoint with full examples.
firebase/php-jwt, Laravel Sanctum
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Rust
Verify JWT in Rust with the jsonwebtoken crate. Sign and verify HS256/RS256, validate iss/aud/exp, and verify against a JWKS endpoint with full Rust code examples.
jsonwebtoken, jsonwebtoken-rs
Verification fundamentals
Every language verifies JWTs the same way: hardcode the algorithm,
verify the signature, then validate exp,
iss, and
aud. The language-specific pages
above show the exact code; these references explain the rules.