CORS & Environment Config (Backend Setup for Fullstack Deployment)

Estimated Time: 2 hours

Status: ☐ Not Started

🎯 Objectives

• Handle CORS errors in your Express app
• Store sensitive credentials securely with .env files

🔗 Resources

1. MDN – CORS
2. dotenv GitHub

✅ Tasks

• [ ] Install CORS middleware:

  npm install cors
  

• [ ] Use it in Express:

  const cors = require("cors");app.use(cors({ origin: "<http://localhost:3000>", credentials: true }));
  

• [ ] Set up environment variables with dotenv:

  npm install dotenv
  

• [ ] Add to your server entry:

  require("dotenv").config();
  

• [ ] Create a .env file and add your secrets:

  MONGO_URI=yourMongoDBConnectionString
  JWT_SECRET=yourJWTSecret
  

• [ ] Use process.env.VARIABLE in code