Hi @jarrodedg
If you are going to pick the defined array, it should declared as below.
var Cities = ["San Francisco", "San Diego", "Boston"];
pm.environment.set('Cities',Cities);
pm.environment.set("CITY", Cities[Math.floor(Math.random() * Cities.length)]);
After assigning the array to a variable, the last line is for pick the random cities from the defined array.
Now body of the request should contain,
"Location": {
"randomCity": "{{CITY}}",
From the defined array, among the three values it will pick one for every single hit. Is this is your expectation?