How to Set Up JWT Authentication in Angular Micro-Frontend Apps

If you’ve ever tried to implement JWT authentication in an Angular Micro-Frontend architecture, you know the pain. It works fine in a single app. But the moment you split into multiple micro-apps, questions start piling up: Where does the token live? How does each micro-app access it? How do you protect routes across different apps? What happens when the token expires? I’ve solved this in real enterprise projects. Here’s exactly how I do it. The Problem With JWT in Micro-Frontends In a standard Angular app, JWT auth is straightforward — store the token, attach it to requests, guard your routes. But in a Micro-Frontend setup you have multiple independent apps: Shell App (Port 4200) ├── Auth App (Port 4201) └── Dashboard App (Port 4202) Each app is built and deployed separately. So how do they share authentication state? The Solution — Centralized Auth in the Shell The key principle is simple: Handle authentication once in the Shell app. Let all micro-apps inherit it. Here’s how: Step 1