How to delete a file in Node.js All In One

How to delete a file in Node.js All In One

delete / remove

fs.unlinkSync

fs.unlinkSync(path)

path <string> | <Buffer> | <URL>
Synchronous (unlink(2) . Returns undefined.

fs.unlink

fs.unlink(path, callback)

path <string> | <Buffer> | <URL>
callback <Function>
err <Error>

Asynchronously removes a file or symbolic link. No arguments other than a possible exception are given to the completion callback.

fs.unlink() will not work on a directory, empty or otherwise. To remove a directory, usefs.rmdir().

See the POSIX unlink(2) documentation for more details.

import { unlink } from 'node:fs';
// Assuming that 'path/file.txt' is a regular file.
unlink('path/file.txt', (err) => {
  if (err) throw err;
  console.log('path/file.txt was deleted');
});

https://nodejs.org/api/fs.html#fsunlinkpath-callback

fsPromises.unlink

fsPromises.unlink(path)

Added in: v10.0.0
path <string> | <Buffer> | <URL>
Returns: <Promise> Fulfills with undefined upon success.

If path refers to a symbolic link, then the link is removed without affecting the file or directory to which that link refers.
If the path refers to a file path that is not a symbolic link, the file is deleted.
See the POSIX unlink(2) documentation for more detail

https://nodejs.org/api/fs.html#fspromisesunlinkpath

Promise unlink

// ESM
import { unlink } from 'node:fs/promises';

try {
  await unlink('/tmp/hello');
  console.log('successfully deleted /tmp/hello');
} catch (error) {
  console.error('there was an error:', error.message);
}

// CJS
const { unlink } = require('node:fs/promises');

(async function(path) {
  try {
    await unlink(path);
    console.log(`successfully deleted ${path}`);
  } catch (error) {
    console.error('there was an error:', error.message);
  }
})('/tmp/hello');

https://nodejs.org/api/fs.html#promise-example

Callback unlink

//ESM
import { unlink } from 'node:fs';

unlink('/tmp/hello', (err) => {
  if (err) throw err;
  console.log('successfully deleted /tmp/hello');
});

// CJS
const { unlink } = require('node:fs');

unlink('/tmp/hello', (err) => {
  if (err) throw err;
  console.log('successfully deleted /tmp/hello');
});

Synchronous unlinkSync

The synchronous APIs block the Node.js event loop and further JavaScript execution until the operation is complete.
Exceptions are thrown immediately and can be handled using try…catch, or can be allowed to bubble up.

// ESM
import { unlinkSync } from 'node:fs';

try {
  unlinkSync('/tmp/hello');
  console.log('successfully deleted /tmp/hello');
} catch (err) {
  // handle the error
}

// CJS
const { unlinkSync } = require('node:fs');

try {
  unlinkSync('/tmp/hello');
  console.log('successfully deleted /tmp/hello');
} catch (err) {
  // handle the error
}

demos

fs.unlinkSync

  async writeJSONFile() {
    const file = path.join(__dirname + `/videos.json`);
    // clear &  delete a file 🎉
    if(fs.existsSync(file)) {
      fs.unlinkSync(file, err => {
        if (err) {
          console.log('File is deleted ❌')
          throw err
        } else {
          console.log('File is deleted ✅')
        }
      });
    }
    for (const group of this.groups) {
      // console.log(`group`, group)
      // console.log(`file`, file)
      if (!fs.existsSync(file)) {
        // create
        // console.log(`create`)
        const json = [group];
        // console.log(`json`, json)
        fs.writeFileSync(file, JSON.stringify(json, null, 4), (err) => {
          if(err) {
            console.log(`err ❌`)
          } else {
            console.log(`OK ✅`)
          }
        });
      } else {
        // append
        await this.appendFile(file, group);
      }
    }
    await this.downloadVideos();
  }

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refs

https://attacomsian.com/blog/nodejs-delete-file

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