Apps Script Execution API Error - Permission Denied

Published in: Google Apps Script

The Apps Script Execution API lets you call Google Apps Scripts from standard HTML pages. I’ve been working on a project that involved Apps Script Execution API, it was running perfect in the developer account but as soon as the code was migrated to the client’s Google account, it failed.

  "error": {
    "status": "PERMISSION_DENIED",
    "message": "The caller does not have permission",
    "code": 403

The Google APIs were enabled in the Google Developers Console, the scopes were correct, the Apps Script Execution API was published with “Anyone” account but the script would fail each time the user tried authentication.

  var op = gapi.client.request({
    'root': '',
    'path': 'v1/scripts/' + SCRIPT_ID + ':run',
    'method': 'POST',
    'body': request

Turned out the problem was somewhere else. The Request Body that is sent with the HTTP POST request has a parameter called devMode. The default is false but is generally set to true in the development mode to save the developer from having to publish a new version every time a change is made to the code.

  var request = {
    'function': 'ctrlq',
    'parameters': [],
    'devMode': true // Should be set to FALSE

Remember to set devMode to false during deployment and the Permission Denied error would be fixed.

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Published in: Google Apps Script

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Web Geek, Google Developer Expert
Amit Agarwal

Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India. He is the developer of Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory

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