is-plain-obj 
Check if a value is a plain object
An object is plain if it's created by either {}, new Object() or Object.create(null).
Install
$ npm install --save is-plain-obj
Usage
var isPlainObj = require('is-plain-obj');
isPlainObj({foo: 'bar'});
//=> true
isPlainObj([1, 2, 3]);
//=> false
Related
- is-obj - Check if a value is an object
License
MIT © Sindre Sorhus