By default, all API calls return a JSON response. However, some operations return other data types, such as image data, depending on the format chosen by the API call. The desired format is indicated by appending a type extension to the URL path. For example, .png might be used to request a PNG image response. The specific extensions supported and their effect can be found on the page for each API call that supports multiple formats. If the extension is omitted, .json is assumed.