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Conceptual illustration of cookies, sessions, and JWT authentication flow

How Web Authentication (Cookies, Sessions, JWT) Actually Works

Authentication on the web often feels confusing not because it is complicated, but because its core ideas are rarely explained in a clean order. This post builds that order. We will start from the nature of the web itself, explain cookies and server-side sessions as a single coherent model, then expand outward to JWT and why it fits modern distributed systems. The goal is not to overwhelm you, but to give you a mental model you can reuse. ...

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