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

in old days before sit down I always check if chair is there then I sit else I have an alternative plan like sit on a coach. Now node.js site suggest just go (no needs to check) and the answer looks like this:

    fs.readFile( '/foo.txt', function( err, data )
    {
      if(err) 
      {
        if( err.code === 'ENOENT' )
        {
            console.log( 'File Doesn\'t Exist' );
            return;
        }
        if( err.code === 'EACCES' )
        {
            console.log( 'No Permission' );
            return;
        }       
        console.log( 'Unknown Error' );
        return;
      }
      console.log( data );
    } );

code taken from http://fredkschott.com/post/2014/03/understanding-error-first-callbacks-in-node-js/ from March 2014, and slightly modified to fit computer. It checks for permission as well - remove permission for to test chmod a-r foo.txt