Node.js is a powerful and popular JavaScript runtime environment that enables developers to efficiently build high-performance applications. The following introduces 8 common libraries and functions used in application development, which can be used to cache data, manipulate dates, process images, send emails, make HTTP requests, record requests and responses, compress data and hash passwords, etc. . By using these libraries, developers can optimize Node.js applications and provide a better user experience.
Before introducing these commonly used class libraries, there is another plug-in tool that is especially worth recommending for collection and downloading - CodeGeeX plug-in, which can be directly downloaded and used for free in VSCode and JetBrains IDEs. The CodeGeeX plug-in can automatically realize code generation, can add comments to the code line by line, and can also perform code translation between different programming languages. The particularly commendable function " Ask CodeGeeX " deeply integrates the intelligent question-and-answer function similar to chatGPT with the developer programming environment IDE. Developers can solve technical problems through question-and-answer dialogue in the IDE.
Using the Ask CodeGeeX function in the IDE enables the problems encountered during the development process to be solved immersively in the IDE, without jumping out of the development environment to find answers to code problems, which improves the efficiency of code development. At the same time, in this new version, through the shortcuts of the common commands "explain/explain code", "comment/generate comment", "fixbug/check bug" in the dialog area, you can directly operate the code, realize code explanation, and add line by line Code comments, try to fix potential bugs in code snippets and other functions.
"explain/explain code" button to get an explanation of the entire code
When you write code, want to know how a certain piece of generated code is interpreted? Then you can select the code in the code generation area of the CodeGeeX plug-in, and a floating layer will appear in the dialog area on the left sidebar, and the selected code will be displayed at the same time. In the dialog area, press the shortcut button: "Explain Code", and you can reply to the entire code explanation in the dialog interface.
The "comment/generate comment" button adds comments to the code line by line
Similarly, when you want to add comments to a piece of generated code line by line, you can select the code in the CodeGeeX code generation area, and a floating layer will appear in the dialog area of the sidebar, and the selected code will be displayed at the same time. In the dialogue area, through the shortcut button: "Generate comments", you can directly add comments to this code line by line in the dialogue interface.
"fixbug/check bug" to fix potential bugs in the code
When you encounter an error while writing code, select the code in the code generation area of the CodeGeeX plug-in, and a floating layer will appear in the dialog area on the left sidebar, displaying the selected code at the same time. Through the shortcut button: "Check bug" in the dialog area, the code editing area can directly help you find the problem in this code and fix the error, and highlight the area where the code is repaired, which is convenient for code comparison.
Lodash
Lodash is a JavaScript library that provides a set of functions for working with arrays, objects, strings, and other data types. Lodash functions are highly optimized for performance, helping to increase the speed and efficiency of Node.js applications.
Sample Code:
const _ = require('lodash');
const arr = [1, 2, 3, 4, 5];
const sum = _.sum(arr);
console.log(sum); // 15
const data = [1, 2, 3, 4, 5];
const filteredData = _.filter(data, num => num % 2 === 0);
console.log(filteredData); // Output: [2, 4]Node-cache
Node Cache is a caching library that enables developers to cache data in Node.js applications. Caching can help improve application performance by reducing the number of database queries and API calls.
Sample Code:
const NodeCache = require('node-cache');
const cache = new NodeCache({ stdTTL: 60 });
cache.set('key', 'value');
const value = cache.get('key');
console.log(value); // 'value'Moment
Moment.js is a JavaScript library for parsing, manipulating and formatting dates and times. Moment.js makes working with dates and times in Node.js applications easier and more efficient.
Sample Code:
const moment = require('moment');
const date = moment('2022-01-01');
const formattedDate = date.format('MM/DD/YYYY');
console.log(formattedDate); // '01/01/2022'Redis
Redis is an open source in-memory data storage structure widely used in databases, caches, and message brokers. Redis can help improve application performance by enabling fast data retrieval and storage.
Sample Code:
const redis = require('redis');
const client = redis.createClient();
client.set('key', 'value');
client.get('key', function (err, value) {
console.log(value); // 'value'
});Note mailer
Nodemailer is a module for Node.js applications, mainly for sending emails. Nodemailer makes it easier and more efficient to send emails from Node.js applications.
Sample Code:
const nodemailer = require('nodemailer');
const transporter = nodemailer.createTransport({
service: 'gmail',
auth: {
user: '[email protected]',
pass: 'your-password'
}
});
const mailOptions = {
from: '[email protected]',
to: '[email protected]',
subject: 'Test email',
text: 'This is a test email'
};
transporter.sendMail(mailOptions, function (error, info) {
if (error) {
console.log(error);
} else {
console.log('Email sent: ' + info.response);
}
});Morgan
Morgan is a logging middleware for Node.js applications. Can be used to record HTTP requests and responses, helping developers debug and optimize their applications.
Sample Code:
const express = require('express');
const morgan = require('morgan');
const app = express();
app.use(morgan('combined'));
app.get('/', (req, res) => {
res.send('Hello World!');
});
app.listen(3000, () => {
console.log('Server started on port 3000');
});Node-gzip
Node-gzip is a module for compressing and decompressing data in Node.js applications. Helps improve application performance by compressing the size of data sent over the network.
Sample Code:
const zlib = require('zlib');
const input = 'Lorem ipsum dolor sit amet';
zlib.gzip(input, function (err, compressed) {
if (err) {
console.log(err);
} else {
console.log('Compressed data: ' + compressed.toString('base64'));
zlib.gunzip(compressed, function (err, decompressed) {
if (err) {
console.log(err);
} else {
console.log('Decompressed data: ' + decompressed.toString());
}
});
}
});Bcrypt
Bcrypt is a module for working with hashed passwords in Node.js applications. Hashing passwords helps improve application security and protect user data.
Sample Code:
const bcrypt = require('bcrypt');
const password = 'mypassword';
bcrypt.hash(password, 10, function (err, hash) {
if (err) {
console.log(err);
} else {
console.log('Hashed password: ' + hash);
bcrypt.compare(password, hash, function (err, result) {
if (err) {
console.log(err);
} else {
console.log('Password match: ' + result);
}
});
}
});The above 8 Node.js commonly used libraries do not need to be copied and pasted. In the CodeGeeX plug-in, Chinese comments are used to describe the requirements, and CodeGeeX can be used to directly generate them in your code context. Quickly install and use it!
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