Why should you care?

Raw http.createServer lacks structure; Express is the industry default for REST services.

See it live — copy this example

Paste into your MeanVerse project (Angular + Express + MongoDB), then run with ng serve / node / mongosh as noted.

import express from 'express';
import cors from 'cors';
import { accountsRouter } from './routes/accounts.routes.js';

const app = express();
app.use(cors({ origin: process.env.ANGULAR_APP }));
app.use(express.json({ limit: '1mb' }));
app.use('/api/accounts', accountsRouter);
app.use((_req, res) => res.status(404).json({ message: 'Not found' }));

export { app };

What happened?

• app.use mounts middleware in order.
• express.json parses JSON bodies.
• Router modules keep routes split by domain.

Practice next

1. Create app.ts exporting configured Express instance.
2. Add cors for Angular dev origin localhost:4200.
3. Mount one router at /api/accounts.
4. Add express.urlencoded for legacy form posts.
5. Mount versioned router at /api/v1.

Remember

Express = middleware pipeline + routers. Export app for supertest integration tests. JSON APIs power Angular HttpClient.

SaaS multi-tenant API

MeanVerse mounts tenant middleware before all /api routes.

Outcome: Single Express app serves 500 tenants with shared codebase.