Deleting files from fs in nodejs

In Node.js, we can use the fs module to read and write files, which also includes file deletion operations. This article will introduce how to delete files using the fs module of Node.js.

fs module

In Node.js, the fs module is one of the most commonly used modules. It provides basic file operation functions, including file reading, Write, modify, delete and other operations. To use the fs module in Node.js, you first need to import the module:

const fs = require('fs');

fs.unlink()

fs.unlink()Method for deleting files. Its syntax is as follows:

fs.unlink(path, callback)

Among them, path represents the file path to be deleted, which can be an absolute path or a relative path; callback is the callback function after the deletion is completed. .

For example, delete the example.txt file in the current directory:

fs.unlink('example.txt', (err) => {
  if (err) throw err;
  console.log('文件已删除');
});

In the callback function, if an error occurs, an exception will be thrown, otherwise it will be output File deleted.

fs.unlinkSync()

In addition to using the callback function for asynchronous deletion operations, you can also use the fs.unlinkSync() method to perform synchronous deletion operations. How to use it Similar to the fs.unlink() method:

fs.unlinkSync(path);

For example, delete the example.txt file in the current directory:

fs.unlinkSync('example.txt');

But be careful Unfortunately, an exception will be thrown if an error occurs during the synchronous deletion operation, so error handling needs to be performed when calling this method.

Delete directory

Using fs.unlink() and fs.unlinkSync() methods can only delete files. If you want to delete a directory, You can use the fs.rmdir() or fs.rmdirSync() method, as shown below:

fs.rmdir(path, callback);
fs.rmdirSync(path);

where path means to delete The directory path can be an absolute path or a relative path.

It should be noted that when using fs.rmdir() to delete a directory, the directory must be an empty directory, otherwise the deletion will fail. If you want to delete a non-empty directory, you need to delete all files in the directory first, and then delete the directory.

Summary

This article introduces how to delete files using the fs module of Node.js, which are fs.unlink() and fs.unlinkSync(). To delete a directory, use the fs.rmdir() and fs.rmdirSync() methods. When using these methods to delete files, you need to ensure that the files are not used by other programs during the operation, otherwise the deletion will fail.

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