Node.js 开发必备的七大 npm 包

源内容（英文）

NodeJS has become an effective tool for server-side development, thanks to its extensive ecosystem of npm packages. These packages offer a wide range of functionalities, from web frameworks to utility libraries, enabling users to build robust and scalable applications efficiently. In this article, we‘ll delve into seven top npm packages for NodeJS development, along with installation instructions and usage examples.

We will discuss about top npm packages for node:

Table of Content

• 1. Express
• 2. Lodash
• 3. Axios
• 4. Socket.io
• 5. Mongoose
• 6. Nodemon
• 7. Joi
• Conclusion

1. Express:

Express JS stands out as a simple web framework that simplifies building web applications and APIs in NodeJS. Its unopinionated nature allows users to structure applications according to their preferences, making it a go-to choice for many projects.
To install it in the project run the following command:

npm install express

Syntax:

const express = require(‘express‘);
const app = express();

app.get(‘/‘, (req, res) => {
  res.send(‘Hello, Express!‘);
});

app.listen(3000, () => {
  console.log(‘Server is running on port 3000‘);
});

2. Lodash:

Lodash is a utility library offering a wide range of functions for manipulating arrays, objects, strings, and more in JavaScript. It enhances code readability and simplifies common tasks, such as data manipulation and functional programming.
To install it in the project run the following command:

npm install lodash

Syntax:

const _ = require(‘lodash‘);

const numbers = [1, 2, 3, 4, 5];
const sum = _.sum(numbers);

console.log(sum); // Output: 15

3. Axios:

Axios simplifies making HTTP requests from both browsers and Node.js applications with its promise-based API. It supports features like request and response interception, automatic JSON parsing, and error handling, making it a preferred choice for handling HTTP communication.
To install it in the project run the following command:

npm install axios

Syntax:

const axios = require(‘axios‘);

axios.get(‘https://jsonplaceholder.typicode.com/posts/1‘)
  .then(response => {
    console.log(response.data);
  })
  .catch(error => {
    console.error(error);
  });

4. Socket.io:

Socket.io facilitates real-time, bidirectional communication between clients and servers, making it ideal for building interactive web applications, chat applications, and multiplayer games.
To install it in the project run the following command:

npm install socket.io

Syntax:

const io = require(‘socket.io‘)(http);

io.on(‘connection‘, (socket) => {
  console.log(‘A user connected‘);
  
  socket.on(‘disconnect‘, () => {
    console.log(‘User disconnected‘);
  });
});

5. Mongoose:

Mongoose is an elegant MongoDB object modeling tool designed to work in an asynchronous environment like Node.js. It provides a straightforward schema-based solution to model your application data, offering features such as validation, query building, and hooks.
To install it in the project run the following command:

npm install mongoose

Syntax:

const mongoose = require(‘mongoose‘);
mongoose.connect(‘mongodb://localhost:27017/my_database‘, {
    useNewUrlParser: true, useUnifiedTopology: true 
});

const Schema = mongoose.Schema;
const userSchema = new Schema({
  name: String,
  email: String,
});

const User = mongoose.model(‘User‘, userSchema);

const newUser = new User({
  name: ‘John Doe‘,
  email: ‘[email protected]‘,
});

newUser.save((err, user) => {
  if (err) return console.error(err);
  console.log(‘User saved successfully:‘, user);
});

6. Nodemon:

Nodemon is a handy utility that monitors changes in your NodeJS application and automatically restarts the server whenever a change is detected. This eliminates the need to manually stop and restart the server during development, thereby boosting productivity.
To install it in the project run the following command:

npm install nodemon --save-dev

Syntax:

nodemon server.js

7. Joi:

Joi is a powerful schema description language and data validator for [JavaScript](https://www.geeksforgeeks.org/javascript/javascript-tutor