Add property to an array of objects

With ES6 you can simply do:

 for(const element of Results) {
      element.Active = "false";
 }

Use Array.prototype.map()

Results.map(obj => ({ ...obj, Active: 'false' }))

Read the documentation for more information.

You can use the forEach method to execute a provided function once for each element in the array. In this provided function you can add the Active property to the element.

Results.forEach(function (element) {
  element.Active = "false";
});