Below is a Lambda function to return the number of fields in a JSON document. This Lambda function expects the JSON document in a body field of the event. It loads the JSON document using the standard json.loads() and counts the number of fields by retrieving the keys of the loaded JSON object and calculating the length. The expected response would be a 200 status code if successful, with the number of fields as a string in the response body (which can easily be changed to an int, but made sense to leave as str so if it got some wacky data I’d see that). If the JSON document is…