How to Setup a Node.js App with MongoDB and Express
Node.js is a popular runtime environment for building server-side applications. When combined with MongoDB, a NoSQL database, and Express, a web application framework for Node.js, you can create a powerful and scalable web application. In this article, we will explore how to set up a Node.js app with MongoDB and Express.
Step 1: Install Node.js and MongoDB
First, you need to install Node.js and MongoDB on your machine. You can download Node.js from the official website and MongoDB from the MongoDB website. Follow the installation instructions for your operating system.
Step 2: Create a new Node.js project
Open your terminal and create a new directory for your Node.js project. Navigate to the directory and run the following command to create a new Node.js project:
npm init
Follow the prompts to set up your project and install the necessary dependencies.
Step 3: Install Express
Once you have created your Node.js project, you need to install Express. Run the following command to install Express as a dependency:
npm install express
Step 4: Install MongoDB and Mongoose
Next, you need to install MongoDB and Mongoose, a MongoDB object modeling tool for Node.js. Run the following command to install MongoDB and Mongoose:
npm install mongodb mongoose
Step 5: Set up your Express app
Create a new JavaScript file for your Express app and add the following code to set up your app:
const express = require('express');
const app = express();
app.get('/', (req, res) => {
res.send('Hello World!');
});
app.listen(3000, () => {
console.log('App listening on port 3000');
});
Step 6: Connect to MongoDB
To connect to your MongoDB database, you need to add the following code to your Express app:
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });
const db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', () => {
console.log('Connected to MongoDB');
});
Step 7: Run your Node.js app
Finally, run your Node.js app by running the following command in your terminal:
node app.js
Your Express app should now be running on port 3000. You can access it in your browser by navigating to localhost:3000.
Congratulations! You have successfully set up a Node.js app with MongoDB and Express. You can now start building your web application using these powerful technologies.
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