title: JSON numbers formatted with commas
body: <p>How can I take some JSON data that contains a number and insert commas in the numbers? 
  Example: I fetch some JSON data from a url and can display it, it contains a number. let's say 100000. (100,000). It doesn't have a comma to better show <strong>100,000</strong>. </p>
  
  <p>language used: Angular 6 (Typescript)</p>