Detailed explanation of fs module and Path module methods in Node.js

Overview:

The filesystem module is a simple wrapper around the standard POSIX set of file I/O operations. The module can be obtained by calling require("fs"). All methods in the filesystem module have asynchronous and synchronous versions.

Asynchronous methods in the file system module require a completion callback function as the last parameter passed in.
The composition of the callback function is determined by the asynchronous method called. Usually, the first parameter of the callback function is the returned error message.
If the asynchronous operation executes correctly and returns, the error parameter is null or undefined. If you use the synchronous version of the operation method, if an error occurs, the error will be returned in the usual way of throwing an error.
You can use try and catch statements to intercept errors and allow the program to continue.

fs module

• The fs module is an official module provided by Node.js for operating files. It provides a series of methods and properties to meet users' file operation needs.
• fs.readFile() method is used to read the contents of the specified file. fs.writeFile() method is used to write the contents to the specified file.

Imported by

The specific usage rules are as follows:

The path module

The path module is an official module provided by Node.js for processing paths. Used to meet users' path processing and needs.

First, introduce it as follows

For example:

The path.join() method is used to concatenate multiple path fragments into a complete path string. The path.basename() method is used to parse the file name from the path string. The path.extname() method is used to obtain the extension part of the path.

path.join() Method

2.path.basename() method

3.path.extname() method

Summary: The fs module and the path module are both core modules of Node.js. Both operate on files, but the difference is that the fs module operates on reading and writing file contents, while the path module operates on file names and paths. Do not confuse them when using them.

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