JWT, Sessions, and OAuth: Key Differences and When to Use Each

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A developer reflecting on an early authentication mistake outlines the core differences between three widely used approaches: sessions, JSON Web Tokens, and OAuth. Sessions store a random identifier server-side and are easy to revoke, but require a shared store when scaling horizontally. JWTs are stateless and scalable, making them well-suited for APIs and microservices, though stolen tokens remain valid until expiry since they cannot be instantly revoked. OAuth 2.0 is an authorization framework — not an authentication protocol — that allows third-party apps to act on a user's behalf without accessing their password, often paired with OpenID Connect for identity verification. Each method carries distinct trade-offs, and choosing the right one depends on the specific requirements of the application being built.

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