I can use javascript Google API to authentifie my webapp and create new file in Google Drive, as it's explained in this post :
function createNewFile() { gapi.client.load('drive', 'v2', function() { var request = gapi.client.request({ 'path': '/drive/v2/files', 'method': 'POST', 'body':{ "title" : "test.txt", "description" : "Some" } }); request.execute(function(resp) { console.log(resp); }); }); } It creates an empty file in Drive. But I don't know how to create a new non-empty file by adding text content to it (for example "blablabla"). Can someone please help me ?