This feature is documented: https://developers.google.com/gdata/samples/spreadsheet_sample https://developers.google.com/gdata/samples/spreadsheet_samp... In f

This feature is documented: https://developers.google.com/gdata/samples/spreadsheet_sample https://developers.google.com/gdata/samples/spreadsheet_samp... In fact, it's a core feature of GData: https://developers.google.com/gdata/docs/json#Request https://developers.google.com/gdata/docs/json#Request That's not to say the API will never change, but if it does, it will be documented here: https://developers.google.com/google-apps/spreadsheets/ https://developers.google.com/google-apps/spreadsheets/ (Disclaimer: I used to be the Google Developer Relations engineer responsible for Spreadsheets, but that was ~4 years ago.)