How To Build a Node.js Application with Docker

Introduction

Docker is a platform for developing, shipping, and running applications using container technology. In this tutorial, we will learn how to build a Node.js application with Docker.

Prerequisites

• Basic knowledge of Node.js and Docker
• Node.js and Docker installed on your system

Steps

1. Create a Node.js application
2. Create a Dockerfile
3. Build the Docker image
4. Run the Docker container

Step 1: Create a Node.js Application

First, we need to create a Node.js application. Let's create a simple "Hello, World!" application. Create a new folder and navigate to it in your terminal. Then, run the following command:

      mkdir node-docker-app
      cd node-docker-app
      npm init -y
      touch index.js
    

Open the index.js file in your favorite text editor and add the following code:

      const http = require('http');

      const hostname = '0.0.0.0';
      const port = 3000;

      const server = http.createServer((req, res) => {
        res.statusCode = 200;
        res.setHeader('Content-Type', 'text/plain');
        res.end('Hello, World!\n');
      });

      server.listen(port, hostname, () => {
        console.log(`Server running at http://${hostname}:${port}/`);
      });
    

Save the file and exit your text editor.

Step 2: Create a Dockerfile

Next, we need to create a Dockerfile. This file will contain the instructions for building the Docker image. Create a new file called Dockerfile