Introduction
API security is critical for MERN stack applications. This tutorial covers authentication middleware, input validation, and rate limiting.
Helmet and CORS
`js import helmet from 'helmet'; import cors from 'cors';
app.use(helmet()); app.use(cors({ origin: process.env.ALLOWED_ORIGINS.split(',') })); `
Input Validation with Zod
`js import { z } from 'zod';
const userSchema = z.object({ email: z.string().email(), password: z.string().min(8), }); `
Conclusion
Layer security controls from the start of your MERN project.
