This library allows a user (or service account) to authenticate with Firestore and edit their Firestore database within a Google Apps Script.

Read how this project was started here.

In the Google online script editor, select the Resources menu item and choose Libraries.... In the "Add a library" input box, enter MX2_NUfxVpaA1XPcZ_N-3wWb_Hp7BVbw3 and click "Add." Choose the most recent version number.

Follow these instructions (just the "Creating a service account" section) to obtain a service account email address and private key. Ensure you have given the account full read/write access to the https://www.googleapis.com/auth/datastore scope.

Now, with your service account email address email and private key key, we will create a document with a field name with value test!. You will need your project ID to do this (we'll assume you've stored the ID in a variable called projectId).

We encode these fields as a JSON object:

const data = {
  "name": "test!"
}

Now, we can create a document called FirstDocument at a collection called "FirstCollection":

FirestoreApp.createDocumentWithId("FirstCollection", "FirstDocument", data, email, key, projectId)

To update the document at this location, we can use the updateDocument function:

FirestoreApp.updateDocument("FirstCollection/FirstDocument", data, email, key, projectId)

Note: Although you can call updateDocument without using createDocument to create the document, any documents in your path will not be created and thus you can only access the document by using the path explicitly.

Contributions are welcome -- send a pull request! This library is a work in progress and currently only supports creating and updating documents with fields (whose values are strings, numbers, booleans, arrays, or objects).