Authentication Mechanisms: JWT, OAuth, and Single Sign-On (SSO)

<p>JWT (JSON Web Tokens) have become a default choice for authentication and authorisation in modern systems.</p> <p>They are widely adopted because they are:</p> <ul>

<p><strong>How I Built JWT Authentication in Spring Boot (Beginner-Friendly Guide)</strong></p> <p>Authentication is one of the first things every backend developer learns when

<blockquote> <p><em>JWT tutorials only teach the easy part. Here's what happens after.</em></p> </blockquote> <p>Most auth tutorials end at "user logs in, gets a token, done." And

<h1> Understanding OAuth2 the Simple Way </h1> <p>You are building a side project and want users to log in with their Google accounts instead of making up yet another password

<p>The <em>mobile app authentication best practices</em> question is the single hardest one to answer well in mobile application security, because the answers that work for web

<h2> The Next Step </h2> <p>In <a href="https://dev.to/writing/building-an-authentication-service/">Extracting Authentication to a Microservice</a>, I described building a

<p>Authentication is often presented as a short sequence:</p> <ol> <li>Accept a username and password.</li> <li>Return a JWT.</li> <li>Protect a few endpoints.</li> </ol> <p>That

<h2> The Problem </h2> <p>Authentication isn't a feature you bolt on - it's foundational infrastructure that deserves its own service boundary.</p> <p>I recently architected and