How to Access Secrets from Google Secret Manager using Apps Script

This detailed guide explains how you access your passwords, API keys and other sensitive data stored in the Google Secret Manager with Google Apps Script.

Google Secret Manager is a cloud service where you can store sensitive data such as passwords, database credentials, encryption keys or any other confidential information that you don’t want to hardcode in your application’s source code. You can also set up an expiration time for the secret and the Google Secret Manager will automatically delete the secret after the specified time.

Google Apps Script - Secret manager

The following guide explains how you can use Google Apps Script to access secrets stored in the Google Secret Manager. But before we proceed, let’s first create a secret in the Google Secret Manager.

Enable Google Secret Manager

1. Open the Google Cloud Console and create a new project.

Create Google Cloud Project

2. Go to the Library section of your Google Cloud project and enable the Secret Manager API.

Enable Secret manager API

3. Go to the IAM & Admin > IAM section of your Google Cloud. Click on Grant Access and add the Secret Manager Secret Accessor role to the Google account from which you want to access the secrets stored in the Google Secret Manager.

Add IAM Roles

Create a Secret in Google Secret Manager

Now that you have enabled the Secret Manager API and granted access to your Google account, let’s create a new secret in the Google Secret Manager.

Go to the Secret Manager and click on the Create Secret button to create a new secret.

Give your secret a name and add the secret value - this could be a plain text string, or you can upload a binary file up to 64KB in size. If you would like the secret to expire after a certain time, you can set an expiration time for the secret.

Secret manager - Create a Secret

In the above example, I have created a secret named MyBankPassword with the value MySuperSecretPassword. Google Secret Manager will automatically assign a version number (1) to the secret. You cannot change the secret value once it has been saved but you can create a new version of the secret with a different value.

Access Google Secret Manager from Google Apps Script

Now that you have created a secret in the Google Secret Manager, let’s write a Google Apps Script that will fetch the secret value from the Google Secret Manager.

Go to to create a new Google Apps Script project. Go to the Project Settings and enable the Show appsscript.json manifest file in editor option. Switch to the appsscript.json tab and add the following OAuth scopes to the manifest file:

Manifest file

  "oauthScopes": [

Next, add the following function to your Google Apps Script project. Replace the project_id, secret_id, and version_id variables with the actual values of your secret.

The project_id is the project number of your Google Cloud project and can be found in the Google Cloud Console here.

After you have added the function to your Google Apps Script project, run the main function to fetch the secret value from the Google Secret Manager and log it to the Google Apps Script Logger.

const main = () => {
  const project_id = '<<YourProjectId>>';
  const secret_id = '<<YourSecretId>>';
  const secret_value = getSecretValue_({ project_id, secret_id });
  Logger.log('The secret value for %s is %s', secret_id, secret_value);

const getSecretValue_ = ({ project_id, secret_id, version_id = 1 }) => {
  const endpoint = `projects/${project_id}/secrets/${secret_id}/versions/${version_id}:access`;
  const api = `${endpoint}`;
  const response = UrlFetchApp.fetch(api, {
    method: 'GET',
    headers: {
      Authorization: `Bearer ${ScriptApp.getOAuthToken()}`,
      'Content-Type': 'application/json',
    muteHttpExceptions: true,

  const { error, payload } = JSON.parse(response.getContentText());

  // If there was an error, throw an exception
  // The secret may not exist or the user may not have access to it
  if (error) {
    throw new Error(error.message);

  // The secret value is Base64-encoded, so we need to decode it
  const bytes = Utilities.base64Decode(;
  const base64 = => `%${byte.toString(16).padStart(2, '0')}`).join('');
  const secretValue = decodeURIComponent(base64);
  return secretValue;
Amit Agarwal

Amit Agarwal

Google Developer Expert, Google Cloud Champion

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.

Amit has developed several popular Google add-ons including Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory


Awards & Titles

Digital Inspiration has won several awards since it's launch in 2004.

Google Developer Expert

Google Developer Expert

Google awarded us the Google Developer Expert award recogizing our work in Google Workspace.

ProductHunt Golden Kitty

ProductHunt Golden Kitty

Our Gmail tool won the Lifehack of the Year award at ProductHunt Golden Kitty Awards in 2017.

Microsoft MVP Alumni

Microsoft MVP Alumni

Microsoft awarded us the Most Valuable Professional (MVP) title for 5 years in a row.

Google Cloud Champion

Google Cloud Champion

Google awarded us the Champion Innovator title recognizing our technical skill and expertise.

Email Newsletter

Sign up for our email newsletter to stay up to date.

We will never send any spam emails. Promise.