How to upload a list of JSON documents to Google Firestore. This script puts documents into a collection named "animals"

firestoreUpload.js

const firebase = require("firebase-admin");
const serviceAccount = require("./firebase-config.json"); // from the Firebase project overview page 

firebase.initializeApp({
  credential: firebase.credential.cert(serviceAccount),
  databaseURL: "https://<PROJECT_NAME>.firebaseio.com"
});

// this code could theoretically run in a Cloud Function as the back-end to a volunteer filling out a form, 
// or scraping a 3rd party animal database, which will spin through the records and create entries in Firestore 
// under a collection named "animals"
const db = firebase.firestore();
const data = [
  {
    id: "A771016",
    name: "Beasley",
    dob: "January 1, 2013",
    sex: "m",
    kennel: "033",
    weight: 80,
    intake_date: "March 3, 2018",
    energy_level: "green",
    dog_friendly: true,
    cat_friendly: false,
    house_trained: true,
    surgery_date: "September 1, 2013",
    attributes: [ "EA", "ER" ],
    notes: "All around good doggo",
    photo_urls: [
      "http://petharbor.com/get_image.asp?RES=Detail&ID=A769824&LOCATION=ASTN"
    ],
    profile_active: true
  },
  {
    id: "A770990",
    name: "McKenzie",
    dob: "January 30, 2015",
    sex: "f",
    kennel: "440",
    weight: 70,
    intake_date: "March 3, 2018",
    energy_level: "blue",
    dog_friendly: true,
    cat_friendly: false,
    house_trained: true,
    surgery_date: "November 1, 2013",
    attributes: ["EA", "ER"],
    notes: "Fetches ball like no other",
    photo_urls: [
      "http://petharbor.com/get_image.asp?RES=Detail&ID=A770990&LOCATION=ASTN"
    ],
    profile_active: true
  }
];

data.forEach(doc => {
  db
    .collection("animals")
    .doc(doc.id)
    .set(doc)
    .then(res => {
      console.log("Document successfully written!");
    })
    .catch(error => {
      console.error("Error writing document: ", error);
    });
});