How to convert path in nodejs

Node.js is a JavaScript running environment based on event-driven and non-blocking I/O. In the development of Node.js, it is often necessary to process file paths. In path processing, there are some common requirements, such as converting relative paths to absolute paths; converting Unix-style paths to Windows-style paths, or converting URLs to real paths, etc. This article will introduce the path module in Node.js and the path conversion methods it provides.

Introduction to path module

The path module in Node.js provides some common methods for processing file paths. This module can be used in the following ways:

const path = require('path');

Using the path module, we can easily operate and convert paths. Below, some common path conversion methods will be introduced.

Convert a relative path to an absolute path

In Node.js, you can convert a relative path to an absolute path through the following method:

const absolutePath = path.resolve(__dirname, 'relative/path/to/file');

Among them, __dirname is Node. A constant in js that represents the absolute path to the directory where the current script is located. The second parameter is the relative path that needs to be converted.

Convert Unix-style paths to Windows-style paths

Under Windows systems, file paths are represented by backslashes (). Under Unix systems, file paths are represented by forward slashes (/). In Node.js, you can use the following method to convert a Unix-style path to a Windows-style path:

const windowsPath = path.win32.normalize('/root/home/user/file');

Convert a Windows-style path to a Unix-style path

In Node.js , you can use the following method to convert a Windows-style path to a Unix-style path:

const unixPath = path.posix.normalize('C:\root\home\user\file');

Convert the URL path to a real path

In some scenarios, we may need to convert the URL path to a real path is the real path. For example, in a static file server, the corresponding file needs to be read according to the URL path. In Node.js, you can use the following method to convert the URL path to a real path:

const realPath = path.resolve('public', decodeURI('/static/%E5%9B%BE%E7%89%87.jpg'));

In the above code, 'public' is the root directory of the file server, and '/static/image.jpg' is The requested URL path, the URL can be decoded into a Chinese path through the decodeURI method. Finally, they can be combined into a real path through the resolve method.

Get path information

In Node.js, you can obtain path information through the following method:

const pathInfo = path.parse('/root/home/user/file.txt');

This method returns an object containing path information, which includes the following properties :

• root: The root of the path
• dir: The part of the path excluding the file part
• base: The part of the file name in the path
• ext: The extension name of the file in the path
• name: The part of the file name (excluding the extension) in the path

Through these attributes, we can easily process the path.

Conclusion

This article introduces the common path conversion methods provided by the path module in Node.js. Using these methods, file paths can be easily manipulated and converted. For Node.js developers, an in-depth understanding of the use of the path module will make development more convenient and efficient.

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