Raymon Schouwenaar

Finding duplicate property values in an Array of Objects in JavaScript is not always that simple if you thought, so let’s dive in! A few days ago I needed to work this out, so I thought let’s write it down, so I could use it later again!

Array of Objects

Let’s define an example Array of Objects, where each Object is a user:

var myArray = [
  {id: 1, name: 'Foo Bar', email: 'foo@bar.com'},
  {id: 2, name: 'Bar Foo', email: 'bar@foo.com'},
  {id: 3, name: 'Joe Ocean', email: 'joe@ocean.com'},
  {id: 3, name: 'Jenny Block', email: 'foo@bar.com'},
];

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