# How to setup a a custom Google OAuth2 client for gas, from A to Z ## [1] Creating a Google Cloud project - Go to https://console.cloud.google.com/projectcreate to create a project - Pick a 'Project name' (e.g. 'MyGasApp') - Click 'Create' ## [2] Setup Oauth consent screen - Go to the 'Oauth consent screen'-tab - Fill in a 'Product name shown to users' (e.g 'Gas')
All other fields are optional. (https://raw.githubusercontent.com/MaartenDesnouck/google-apps-script/master/images/logo/gas-logo.png, might be a good 'Product logo URL') - Click 'Save' ## [3] Create API credentials - Go to the 'Credentials'-tab - Click 'Create credentials' - Click 'OAuth client ID' - Pick 'Web application' - Fill in a 'Name' for the set of credentials you are creating (e.g. gas-credentials-v1) - Add 'http://localhost' to the 'Authorized JavaScript origins' - Add 'http://localhost' to the 'Authorized redirect URIs' - Click 'Create' You will get a pop-up with some keys, don't close this pop-up but go to step [4] ## [4] Configuring gas to use your credentials - Go to your terminal - Run 'gas config' - Answer the question if you want to use .gs as default extension ('n' will keep the default extension) - Answer 'y' to the question if you want to use a custom OAuth 2.0 client - Paste the client ID from the pop-up - Paste the 'client secret' from the pop-up You should see 'Succesfully configured gas [✔]' - Run 'gas auth' - You should be redirected to approve your new credentials to make API requests to your Google Drive