How to delete files in nodejs

Node.js is a very powerful Javascript runtime, which contains a very useful file system API, which allows us to easily operate the file system. In Node.js, we can delete files with a few lines of code. This article will introduce how to delete files in node.js.

1. Delete files through the fs.unlink method

Node.js provides a fs.unlink() method, which can delete files. This method requires a file path as a parameter, which can be relative or absolute.

When using the fs.unlink() method, you need to pay attention to the following:

(1) If the file does not exist, this method will throw an exception.

(2) If the file is occupied or opened by other programs, this method will not be able to delete the file.

(3) If the folder is deleted, the operation cannot be undone.

The following is a sample code that uses the fs.unlink() method to delete files:

const fs = require('fs');

// Delete File
fs.unlink('file.txt', (err) => {
  if (err) throw err;
  console.log('File deleted!');
});

2. Use the fs.existsSync method to delete files

We can use fs.existsSync () method to check whether the file exists. If the file exists, you can use the fs.unlinkSync() method to delete the file. The fs.unlinkSync() method blocks the JavaScript thread until the file is deleted.

The following is a sample code that uses the fs.existsSync() and fs.unlinkSync() methods to delete files:

const fs = require('fs');
const path = 'file.txt';

if (fs.existsSync(path)) {
  fs.unlinkSync(path);
  console.log('File deleted!');
}

3. Use the fs.promises.unlink method to delete files (Node.js 10 and above)

Starting with Node.js 10, Node.js introduces the fs.promises module, which provides the same operation methods as the fs module, except that it returns them as Promises. Therefore, we can use the fs.promises.unlink() method to delete the file.

The following is a sample code that uses the fs.promises.unlink() method to delete files:

const fs = require('fs').promises;

fs.unlink('file.txt')
  .then(() => console.log('File deleted!'))
  .catch(err => console.error(err));

The above is how node.js deletes files. If you want to delete files, all three methods above can be used. If you are using an earlier version of Node.js, you can only delete files using fs.unlink() or fs.existsSync() and fs.unlinkSync() methods. No matter which method you use, be sure to check whether the file exists before deleting it.

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