How to connect to mongoDB database using in node js?

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Accepted Answer

const { MongoClient } = require('mongodb'); const uri = "mongodb+srv://:@/?retryWrites=true&w=majority"; const client = new MongoClient(uri); async function connectToDatabase() { try { await client.connect(); console.log("Connected to MongoDB!"); } catch (err) { console.error("Connection failed:", err); } finally { await client.close(); // Close the connection after use } } connectToDatabase(); const database = client.db("databaseName"); const collection = database.collection("collectionName"); // Example: Fetch documents from the collection const documents = await collection.find({}).toArray(); console.log(documents); import mongoose from "mongoose"; const DATABASE_URL = process.env.DATABASE_URL; if (!DATABASE_URL) { throw new Error( "Please define the DATABASE_URL environment variable inside .env.local" ); } let cached = global.mongoose; if (!cached) { cached = global.mongoose = { conn: null, promise: null }; } async function connectDB() { if (cached.conn) { return cached.conn; } if (!cached.promise) { const opts = { bufferCommands: false, }; cached.promise = mongoose.connect(DATABASE_URL, opts).then((mongoose) => { return mongoose; }); } cached.conn = await cached.promise; return cached.conn; } export default connectDB;

How to connect to mongoDB database using in node js?

We can connect to mongoDB instance using either mongodb node js package or mongoose.

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