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Home/ Questions/Q 6774
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Alek Richter
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Alek RichterEnlightened
Asked: December 22, 20212021-12-22T01:44:32+00:00 2021-12-22T01:44:32+00:00

How do I test for an empty JavaScript object?

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After an AJAX request, sometimes my application may return an empty object, like:

var a = {};

How can I check whether that’s the case?

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  1. Alek Richter Enlightened
    2021-12-22T01:45:22+00:00Added an answer on December 22, 2021 at 1:45 am

    ECMA 5+:

    // because Object.keys(new Date()).length === 0;
    // we have to do some additional check
    obj // 👈 null and undefined check
    && Object.keys(obj).length === 0
    && Object.getPrototypeOf(obj) === Object.prototype
    

    Note, though, that this creates an unnecessary array (the return value of keys).

    Pre-ECMA 5:

    function isEmpty(obj) {
      for(var prop in obj) {
        if(Object.prototype.hasOwnProperty.call(obj, prop)) {
          return false;
        }
      }
    
      return JSON.stringify(obj) === JSON.stringify({});
    }
    

    jQuery:

    jQuery.isEmptyObject({}); // true
    

    lodash:

    _.isEmpty({}); // true
    

    Underscore:

    _.isEmpty({}); // true
    

    Hoek

    Hoek.deepEqual({}, {}); // true
    

    ExtJS

    Ext.Object.isEmpty({}); // true
    

    AngularJS (version 1)

    angular.equals({}, {}); // true
    

    Ramda

    R.isEmpty({}); // true
    
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