title: Get only the content of each commit in a json ? ( git diff json)
body: <p>So I'm storring on my github all the differences I get on a json file during time ( I call an api that updates each time the json and only store the differences). To give you an idea ; It's the changes of availability, either an id is available or not. 
  What I'm trying to do now : I want to get the content of each commit in a json file in my local machine. SO later I can loop through all the json files in sequence using nodejs or python and then generate a CSV with the data that interest me.</p>
  
  <p>Thank you for your help, </p>