ID, token, UUID и slug: в чём разница и почему их нельзя мешать
В каждом бэкенде рано или поздно рядом появляются id , UUID , slug , token и request_id . Все они выглядят как строки, но отвечают за разные вещи. Ког…
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Building AutoStack.Identity: A Zero-Dependency .NET 10 Library for SAML 2.0, JWT, and XML Signing
The Problem That Started This We were building a healthcare connectivity platform — multi-tenant, Azure-hosted, integrating with enterprise IdPs via S…
JWT in Node.js: How It Works, 5 Errors That Compromise Your API, and Refresh Token with Rotation
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 c…
Authentication vs. Authorization: A Deep Dive Every Backend Engineer Must Know
This post is an in-depth breakdown of Authentication (Who are you?) and Authorization (What are you allowed to do?). In the early days, identity was b…
Inside the Auth Service: From Token Validator to Policy Decision Point
Most auth services start simple — verify the token, return 200 or 401. Then requirements accumulate. Tenant isolation. Service accounts. Token revocat…