is-promise

Test whether an object looks like a promises-a+ promise

is-promise

Test whether an object looks like a promises-a+ promise

$ npm install is-promise

You can also use it client side via npm.

var isPromise = require('is-promise');
 
isPromise({then:function () {...}});//=>true 
isPromise(null);//=>false 
isPromise({});//=>false 
isPromise({then: true})//=>false 

MIT