A Developer's Guide to Proper JWT Validation in Modern APIs

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A technical guide published on DEV Community explains how JSON Web Tokens (JWTs) must be thoroughly validated before granting API access. Proper validation goes beyond checking a token's format, requiring verification of the signature, issuer, audience, and time-based claims. The guide covers how ASP.NET Core handles JWT validation pipelines and highlights common misconfigurations that can allow unauthorized tokens to pass through. It also addresses key rotation, token revocation limitations, and cross-service validation challenges. Developers are warned that skipping or incorrectly configuring even one of these checks can leave an API exposed to authentication bypass attacks.

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ProgrammingDEV Community ·

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