API Authentication: Part III. JWT Tokens
JSON Web Tokens (JWT) solve the scalability issues of API keys by embedding authorization information directly within the token, eliminating the need for repeated database lookups. Unlike API keys, which require server-side state checks for permissions, expiry, and status, JWTs carry verified user data that can be validated statelessly. This reduces database load and improves performance in high-volume or distributed systems.
- ▪API keys require a database lookup for each request to verify permissions, expiry, and status.
- ▪JWTs contain all necessary authorization data within the token, enabling stateless validation.
- ▪Using JWTs reduces database roundtrips, which improves scalability in high-traffic and microservices architectures.
- ▪A stateless server can validate a JWT without storing session data, relying only on cryptographic verification.
- ▪JWTs are analogous to boarding passes, where all relevant information is self-contained and verifiable on inspection.
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| Canonical URL | https://dev.to/eugene-zimin/api-authentication-part-iii-jwt-tokens-3c6a |
| Publication time | Sun, 17 May 2026 02:55:46 +0000 |
| Retrieval time | 2026-05-17T03:10:19.134Z |
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Opening excerpt (first ~120 words) tap to expand
try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 1237860) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Eugene Zimin Posted on May 17 API Authentication: Part III. JWT Tokens #api #backend #security #tutorial Why API Keys Aren't Always Enough In Part II we saw that an API key is essentially a long, secret password your software shows to a server. It works, but it has a hidden cost: every time the key is used, the server must look it up in a database to find out what the key is allowed to do, whether it has expired, and whether it has been switched off.
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