isdir

isdir checks if a given file descriptor fd is a directory or not.
(wrapper around node's native fs.stat.isDirectory() method )

Usage

Install from NPM

npm install isdir --save

In your script

var isdir = require('isdir');
var fd    = __dirname; // or what ever you need to check

isdir(fd, function callback(err, dir) { // named callback function
  if(err) { // you will get an error back if fd was not a readable file or dir
    console.log("Oopsy: " + err); // handle errors in your preferred way.
  }
  else if(dir) {
    console.log(fd + " is a directory!"); // do something with the directory
  }
  else {
    console.log(fd + " is NOT a directory!") // its a file
  }
});

About

We needed a fully tested simple call to check if a descriptor is a directory for our faster project.

This module deliberately only exposes a single asynchronous method.

If you prefer to use it sychronously (go for a walk and consider switching programming languages) and if you still want to use it sync just assign the output to varaiable and omit the callback:

var isdir = require('isdir');
var fd    = __dirname;        // or what ever descriptor you need to check
var dir   = isdir(__dirname); // this works but is not encouraged (its blocking)
if(dir) {
  // do what you want with your directory
}

Influenced by: https://github.com/jonschlinkert/is-directory (We wanted lighter error-handling and more tests)