What modules are there in nodejs?

Node.js is a JavaScript running environment based on the Chrome V8 engine. Its emergence allows JavaScript to run on the server side. In Node.js, there are many built-in modules that can be called directly, or third-party modules can be installed through npm (Node.js Package Manager). These modules greatly expand the application scope and functions of Node.js.

The following are some commonly used built-in modules in Node.js:

1. fs module: This module provides access to the file system and can read and write files, create and delete directories, etc. .
2. http module: This module provides support for the HTTP protocol, can create HTTP servers and clients, and implement HTTP requests and responses.
3. url module: This module provides URL parsing function, which can parse a URL string into various parts, such as protocol, host name, path, etc.
4. path module: This module provides methods for operating file paths, such as obtaining the file name, extension, etc. in the path.
5. events module: This module provides event-driven programming, which can realize program logic control by binding events and triggering events.
6. net module: This module provides network communication functions and can implement Socket programming, such as creating TCP servers and clients.
7. crypto module: This module provides encryption and decryption related functions, such as: calculating hash values, generating random numbers, encryption and decryption, etc.
8. os module: This module provides operating system-related functions, such as obtaining CPU architecture, memory information, network information, etc.

In addition to the above common modules, there are many other built-in modules, such as: stream module, child_process module, dns module, etc., which can be called and used according to specific needs.

In addition to the built-in modules in Node.js, third-party modules can also be installed through npm, such as Express, Mongoose, Socket.io, etc. These modules provide richer and more powerful functions and can help developers implement complex applications more conveniently.

In general, Node.js provides many simple and practical modules, and the combination of these modules can support a variety of applications. During the development process, understanding the functions and usage of these modules can help developers complete development work more efficiently.

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