create-mern-backend/index.js

CLI to scaffold MERN backend folder structure with .env and server.js

#!/usr/bin/env node
const fs = require("fs");
const path = require("path");

const folders = [
  "config",
  "controllers",
  "models",
  "routes",
  "middlewares",
  "utils",
];

console.log("📦 Creating MERN backend folder structure...");

// Create folders
folders.forEach((folder) => {
  fs.mkdirSync(folder, { recursive: true });
  console.log(`📁 Created folder: ${folder}/`);
});

// Create server.js
const serverContent = `const express = require('express');
const dotenv = require('dotenv');
const cors = require('cors');
const connectDB = require('./config/db');

dotenv.config();
const app = express();
app.use(cors());
app.use(express.json());

connectDB();

app.get('/', (req, res) => {
  res.send('API is running...');
});

const PORT = process.env.PORT || 5000;
app.listen(PORT, () => console.log(\`Server running on port \${PORT}\`));
`;

fs.writeFileSync("server.js", serverContent);
console.log("📝 Created file: server.js");

// Create config/db.js
const dbContent = `const mongoose = require('mongoose');

const connectDB = async () => {
  try {
    await mongoose.connect(process.env.MONGO_URI, {
      useNewUrlParser: true,
      useUnifiedTopology: true,
    });
    console.log('MongoDB connected');
  } catch (error) {
    console.error('MongoDB connection failed:', error.message);
    process.exit(1);
  }
};

module.exports = connectDB;
`;

fs.writeFileSync(path.join("config", "db.js"), dbContent);
console.log("📝 Created file: config/db.js");

// Create .env file
const envContent = `PORT=5000
MONGO_URI=your_mongodb_connection_string
JWT_SECRET=your_jwt_secret_key
`;

fs.writeFileSync(".env", envContent);
console.log("📝 Created file: .env");

console.log("✅ MERN backend structure ready!");