What external modules does nodejs have?

Node.js is a popular JavaScript runtime environment that uses the V8 JavaScript engine to interpret and execute JavaScript code. Node.js is very popular for writing high-performance, scalable web applications on the server side. Due to its powerful building tools and plug-in capabilities, Node.js has become the first choice for the majority of web developers.

However, in order to make it more convenient for developers to use Node.js, the community has developed many external modules, which provide a variety of functions and features to make development more efficient and simpler. Below are some common Node.js external modules.

1. Express.js

Express.js is one of the extremely popular Node.js web frameworks. It provides many useful features, including routing, template engine, middleware, error handling, static file listening, and more. Express.js makes it easy to build RESTful APIs and web applications.

2. Socket.io

Socket.IO is a JavaScript application programming interface that is used to implement real-time and two-way communication systems. It supports real-time communication technologies such as WebSockets, AJAX long polling, and HTML embedded iframe streaming. It can be used to build chat rooms, multiplayer games, real-time tracking applications, and more.

3. Async

Async is a popular asynchronous programming library that helps control flow and simplify asynchronous operations in Node.js programs. It provides many functions, such as parallel, series, waterfall, etc., which can simplify the processing of asynchronous tasks and make it easier to maintain the application.

4. Lodash

Lodash is a practical JavaScript tool library that provides many functions, from processing strings, numbers and objects to data conversion, date and time processing, There are many other utility functions. It also provides support for functional programming methods, supporting chained calls and currying.

5. Request

request is a convenient lightweight HTTP client module for sending requests to external URLs. It supports features such as HTTP proxies, cookies, tracking redirects, JSON responses, parallel requests, compression, and HTTPS. Generally used by applications to send requests to external APIs.

6. Cheerio

Cheerio is a module that can parse HTML using jQuery-like syntax. It can easily obtain data from HTML, support syntax similar to jQuery to operate DOM elements, and support extraction of HTML structure for use by website crawlers.

7. Bluebird

Bluebird is a powerful Promise library that provides many utilities to handle the results of asynchronous tasks. It supports Promise chaining, Promise concurrency, Promise composition, Promise capture, etc., which can better organize asynchronous operations in applications.

The above are only some of the external modules of Node.js. In fact, there are many other modules, such as Mongoose, Sequelize, Multer, Passport, etc. These modules are indispensable to the Node.js ecosystem. components to make Node.js development more smooth and efficient.

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