Google map with multiple address points

Good Morning! I have a list of address (cities, states, countries) of customers. I am trying to put a very generic map of where we have shipped to in the world. I would like to be able to have a JSON file with an array of Cities, States, and Countries I have shipped to and have those cities show up as pins on a Google map. Project should be delivered in two files. A HTML document with inline JS building the map, and a JSON file with a few sample city, state, country entries. Zack