This is a backend with javaScript Project

🔍 Issues in Your Code & Fixes

Your current setup looks mostly correct, but you're facing MongoDB connection errors.
Let’s fix it step by step.

---

🚀 Fix 1: Check .env File Format

Make sure your .env file is in the root directory and structured properly:

PORT=6000
MONGODB_URI=mongodb+srv://vikaspatel07071999:latghat1234@cluster0.rc0vet2.mongodb.net/mydatabase?retryWrites=true&w=majority
DB_NAME=mydatabase

🔴 Problem: You're not defining DB_NAME inside .env.
✅ Fix: Add DB_NAME to .env so process.env.DB_NAME is not undefined.

---

🚀 Fix 2: Load .env at the Start

Modify index.js to load .env at the very beginning:

import mongoose from "mongoose";
import dotenv from "dotenv";

// ✅ Load environment variables first
dotenv.config();

const MONGODB_URI = process.env.MONGODB_URI;
const DB_NAME = process.env.DB_NAME;  // ✅ Fix: Get DB_NAME from .env

// Debugging: Check if MONGODB_URI and DB_NAME are loaded correctly
console.log("🔍 MongoDB URI:", MONGODB_URI);
console.log("🔍 Database Name:", DB_NAME);

const connectDB = async () => {
  try {
    // ✅ Fix: Ensure MONGODB_URI and DB_NAME are used properly
    const connectionInstance = await mongoose.connect(`${MONGODB_URI}`, {
      dbName: DB_NAME,   // ✅ Fix: Pass DB_NAME separately
      useNewUrlParser: true,
      useUnifiedTopology: true,
    });

    console.log(`✅ MongoDB Connected! DB HOST: ${connectionInstance.connection.host}`);
  } catch (error) {
    console.error("❌ MongoDB Connection Error: ", error);
    process.exit(1);
  }
};

export default connectDB;

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🚀 Fix 3: Ensure .env is Loaded

Before running the server, test if .env is being read correctly:

node -e "require('dotenv').config(); console.log(process.env.MONGODB_URI)"

If nothing is printed or undefined appears, the .env file is either:

• Not at the root level (move it up)
• Not being loaded properly (check for typos)

---

🚀 Fix 4: Add .env to .gitignore

To protect your MongoDB credentials, add .env to .gitignore:

# .gitignore
node_modules/
.env  # ✅ Ignore .env file

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🔥 Final Steps

1️⃣ Move .env to the root if it’s inside src/.
2️⃣ Ensure .env contains DB_NAME (otherwise, it will be undefined).
3️⃣ Restart the server after changes:

npx nodemon src/app.js

---

🚀 Summary

✅ .env should be in the root directory.
✅ Add DB_NAME inside .env.
✅ Pass dbName: DB_NAME in mongoose.connect().
✅ Test with console.log(process.env.MONGODB_URI) before running the app.

Now, restart your server and check if MongoDB connects! 🚀 Let me know if it still doesn't work.