Seven Common JWT Security Mistakes Developers Make During Auth Setup

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A software developer has outlined seven recurring JWT security mistakes commonly found in authentication implementations. Key issues include trusting the token's own algorithm header, storing tokens in localStorage instead of HttpOnly cookies, and failing to plan for token revocation after issuance. Developers are also warned against skipping explicit validation of claims such as expiry, issuer, and audience, since a valid signature alone does not confirm a token is safe to use. Sensitive data such as passwords or billing details should never be placed in JWT payloads, as the content is encoded but not encrypted. The post also notes that choosing between HS256 and RS256 should depend on whether multiple services need to verify tokens independently, not on assumptions about which algorithm is inherently more secure.

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