JWT in Node.js: How It Works, 5 Errors That Compromise Your API, and Refresh Token with Rotation
JSON Web Tokens (JWT) in Node.js are commonly used for authentication but are often misimplemented, leading to security risks. The article explains JWT structure, contrasts it with server-side sessions, and highlights critical errors like storing sensitive data in tokens. It also covers secure implementation practices, including refresh token rotation and proper validation.
- ▪JWT is a stateless authentication mechanism that uses signed tokens, not encrypted ones, making payload data readable by anyone.
- ▪Storing sensitive information like passwords or personal data in JWT payloads is a serious security flaw because Base64URL encoding is not encryption.
- ▪Immediate token revocation is not natively supported in JWT, requiring additional mechanisms like blocklists or short expiration times.
- ▪Using refresh token rotation helps mitigate token theft by invalidating old refresh tokens upon issuance of new ones.
- ▪Proper JWT implementation requires validating the signature algorithm and using standard claims like 'exp', 'iat', and 'jti' as defined in RFC 7519.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3935533) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Dev Code Software Posted on May 17 • Originally published at devcodeweb.online JWT in Node.js: How It Works, 5 Errors That Compromise Your API, and Refresh Token with Rotation #security #jwt #node #webdev A dev submitted a PR with CPF and password hash inside the JWT payload. He thought Base64 was encryption. The reviewer rejected it, opened an urgent card, and spent the afternoon explaining the problem to the team.
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