What are the built-in objects in nodejs?

Node.js is an open source platform built on the Chrome V8 JavaScript engine for quickly building efficient web applications. It is a JavaScript runtime environment that runs JavaScript code on the server.

Node.js has many commonly used objects and modules built-in, which can be used to process files (File System), network (Net), HTTP requests (HTTP), encryption (Crypto), and streams (Stream) )wait. This article will introduce some common built-in objects of Node.js.

1. Global object (Global)

The global object is a JavaScript object accessed in the global scope. Node.js provides some global objects, such as console, process, etc. The console object can be used to output console information, and the process object can be used to process process-related information.

2. Module object (Module)

Node.js module is a function or object used to implement specific functions. Typically, Node.js code is encapsulated in modules for reuse across applications. The Node.js module system includes two operations: module export and import. Through the module object, you can access some important built-in modules, such as http, fs (file system), path, events, etc.

3. Event Object (Event)

Many objects in Node.js support events, such as http server objects, file system objects, etc. Events are triggered by event generators and handled by event listeners. Node.js provides an Event module for creating and handling events.

4. Timer object (Timer)

The Timer object in Node.js supports timer-related functions, such as delayed execution, scheduled execution, etc. Node.js provides three timer functions, setTimeout, setInterval, and setImmediate, which can be used to execute functions after a specified time.

5. Error Object (Error)

In Node.js applications, various errors may be thrown. Node.js provides an Error object for creating and handling errors.

6. Buffer object (Buffer)

The buffer is a data structure that allocates fixed-size memory in which a series of data can be stored. Buffers are very common data structures in network communications, file operations, etc. Node.js provides a Buffer object for creating and processing buffers.

7. Stream Object (Stream)

In Node.js, stream is a method of data transmission and processing that can be used to handle large amounts of data. Streams can be divided into readable streams and writable streams. Node.js provides a stream module for creating and processing stream objects.

8. Path object (Path)

Node.js provides a path module for processing file paths. The path object provides some methods, such as path.join, path.resolve, path.basename, etc., which can be used to operate file paths.

The above are the commonly used built-in objects in Node.js. These objects can be used to process files, networks, HTTP requests, encryption, streams and other operations. Node.js provides some built-in modules and libraries that can be used to manage these objects and implement complex functionality. Mastering these built-in objects allows you to better understand and use Node.js.

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