Node.js check if file exists

Question

How do i check the existence of a file?

In the documentation for the module fs there\'s a description of the method fs.exists(path, cal

Answer 1

vannilla Nodejs callback

function fileExists(path, cb){
  return fs.access(path, fs.constants.F_OK,(er, result)=> cb(!err && result)) //F_OK checks if file is visible, is default does no need to be specified.
}

the docs say you should use access() as a replacement for deprecated exists()

Nodejs with build in promise (node 7+)

function fileExists(path, cb){
  return new Promise((accept,deny) => 
    fs.access(path, fs.constants.F_OK,(er, result)=> cb(!err && result))
  );
}

Popular javascript framework

fs-extra

var fs = require('fs-extra')
await fs.pathExists(filepath)

As you see much simpler. And the advantage over promisify is that you have complete typings with this package (complete intellisense/typescript)! Most of the cases you will have already included this library because (+-10.000) other libraries depend on it.