How to build a Node.js-based HTTP server locally
Node.js is a JavaScript runtime environment that runs on the server and can be used to build efficient and scalable network applications. As an open source platform, Node.js has the world's largest development community, and its rich modular library allows developers to easily build various types of server applications, including Web server (Web server), API server, real-time Applications etc. This article will introduce how to build a Node.js-based HTTP server locally.
1. Preparation work
Before we start building the server, we need to do some preparation work. First, we need to install Node.js. You can download the Node.js installation package from the official website of Node.js (https://nodejs.org/). After the installation is complete, enter node -v on the command line. If the version number appears, Node.js has been installed correctly.
2. Create a working directory
We need to first create a working directory to store server files. At the command line, enter mkdir node-http-server to create a directory named node-http-server.
3. Create server file
In the node-http-server directory, we need to create a server.js file. Using a text editor, enter the following code:
const http = require('http');
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello World!');
});
server.listen(port, () => {
console.log(`Server running at http://localhost:${port}/`);
});This code creates an HTTP server that listens on port 3000 and returns a "Hello World!" response when a request is received. Run this code and you will see the "Server running at http://localhost:3000/" prompt message on the console. Type http://localhost:3000/ into your browser and you should see a "Hello World!" response.
4. Add an HTML page
We can modify the server.js file to return an HTML page. In the node-http-server directory, create the index.html file and enter the following code:
<!DOCTYPE html> <html> <head> <title>Node.js HTTP server</title> </head> <body> <h1>Hello World!</h1> </body> </html>
Then, modify the server.js file and enter the following code:
const http = require('http');
const fs = require('fs');
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/html');
fs.readFile('index.html', (err, data) => {
if (err) {
res.statusCode = 500;
res.end('Error loading index.html');
} else {
res.end(data);
}
});
});
server.listen(port, () => {
console.log(`Server running at http://localhost:${port}/`);
});This code passes fs The module reads the index.html file and sends it to the client as a response. We can enter http://localhost:3000/ in the browser and see the index.html page.
5. Use third-party packages
The Node.js community has many third-party packages that can help us do our jobs better. For example, we can use the Express framework to build more complex web applications. In the node-http-server directory, use the command line to enter npm init, and then enter the information as prompted to generate a package.json file. Next, use the command line to enter npm install express --save to install the Express framework.
In the server.js file, introduce the Express module, and then use the following code to create an HTTP server based on Express:
const express = require('express');
const app = express();
const port = 3000;
app.get('/', (req, res) => {
res.send('Hello Express!');
});
app.listen(port, () => {
console.log(`Server running at http://localhost:${port}/`);
});This code uses the Express framework to create an HTTP server that listens When receiving a GET request from the "/" path, a "Hello Express!" response is returned. Enter http://localhost:3000/ in your browser and you should see the "Hello Express!" response.
Summary
This article introduces how to build a Node.js-based HTTP server locally. We started by installing Node.js, learned how to create a working directory, server files and HTML pages, and created a more complex HTTP server using the third-party framework Express. After mastering these basic operations, we can further explore Node.js and build more complex applications.
The above is the detailed content of How to build a Node.js-based HTTP server locally. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What is useEffect? How do you use it to perform side effects?
Mar 19, 2025 pm 03:58 PM
The article discusses useEffect in React, a hook for managing side effects like data fetching and DOM manipulation in functional components. It explains usage, common side effects, and cleanup to prevent issues like memory leaks.
Explain the concept of lazy loading.
Mar 13, 2025 pm 07:47 PM
Lazy loading delays loading of content until needed, improving web performance and user experience by reducing initial load times and server load.
What are higher-order functions in JavaScript, and how can they be used to write more concise and reusable code?
Mar 18, 2025 pm 01:44 PM
Higher-order functions in JavaScript enhance code conciseness, reusability, modularity, and performance through abstraction, common patterns, and optimization techniques.
How does currying work in JavaScript, and what are its benefits?
Mar 18, 2025 pm 01:45 PM
The article discusses currying in JavaScript, a technique transforming multi-argument functions into single-argument function sequences. It explores currying's implementation, benefits like partial application, and practical uses, enhancing code read
How does the React reconciliation algorithm work?
Mar 18, 2025 pm 01:58 PM
The article explains React's reconciliation algorithm, which efficiently updates the DOM by comparing Virtual DOM trees. It discusses performance benefits, optimization techniques, and impacts on user experience.Character count: 159
How do you prevent default behavior in event handlers?
Mar 19, 2025 pm 04:10 PM
Article discusses preventing default behavior in event handlers using preventDefault() method, its benefits like enhanced user experience, and potential issues like accessibility concerns.
What is useContext? How do you use it to share state between components?
Mar 19, 2025 pm 03:59 PM
The article explains useContext in React, which simplifies state management by avoiding prop drilling. It discusses benefits like centralized state and performance improvements through reduced re-renders.
What are the advantages and disadvantages of controlled and uncontrolled components?
Mar 19, 2025 pm 04:16 PM
The article discusses the advantages and disadvantages of controlled and uncontrolled components in React, focusing on aspects like predictability, performance, and use cases. It advises on factors to consider when choosing between them.
