A super simple command-line Node script to add a document to Firestore

firestore_add_doc.js

/**
 * firestore_add_doc.js
 *
 * This script is assumed to live in an existing Javascript project that has its own package.json.
 * I store this script in <PROJECT_ROOT>/tools/misc/.
 *
 * To use:
 *  1. npm init -y
 *  2. npm install firebase esm
 *  3. Edit this code to set for USER1 and FIREBASE_CONFIG
 *  4. node -r esm firestore_add_doc.js
 *
 * NOTE: this code works with the Firebase Web SDK "v9 modular API".
 *
 */

import {initializeApp} from 'firebase/app';
import {getAuth, signInWithEmailAndPassword} from 'firebase/auth';
import {
  Bytes,
  doc,
  getFirestore,
  setDoc
} from 'firebase/firestore';

let APP, AUTH, FIRESTORE;

// Firebase Console >> Authentication
const USER1 = {
  email: '[email protected]', // USER THAT EXISTS IN FIREBASE AUTH
  password: 'let_me_in',
};

// Firebase Console >> Project Overview >> General >> Apps
//    (use existing app values or click Add app to create new WEB app)
const FIREBASE_CONFIG = {
  apiKey: xxx,
  appId: xxx,
  authDomain: xxx,
  databaseURL: xxx,
  messagingSenderId: xxx,
  projectId: xxx
};

const initializeFB = async () => {
  console.log(`  Initialize Firebase`);
  APP = initializeApp(FIREBASE_CONFIG);
  AUTH = getAuth(APP);
  FIRESTORE = getFirestore(APP);

  try {
    await signInWithEmailAndPassword(AUTH, USER1.email, USER1.password);

    let currUser = AUTH.currentUser;
    console.log(`  Logged in with USER1 -- UID is (${currUser.uid})`);
  } catch (ex) {
    console.error(ex.message);
    throw ex;
  }
};

const main = async () => {
  console.log('>>> START - ', Date());
  try {
    await initializeFB();

    let theData = {
      strVal: "hello",
      numVal: 1234,
      bytesVal: Bytes.fromUint8Array(new Uint8Array([21,31]))
    };

    const docRef = doc(FIRESTORE, "test/test123");
    await setDoc(docRef, theData);

    console.log(`  Successfully wrote to: ${docRef.path}`);
    console.log('  Now check the Firebase Console to see this lovely doc!');
  } catch(ex) {
    console.error("UH-OH! ", ex.message);
    throw ex;
  }

  console.log('>>> DONE - ', Date());
  process.exit();
};

main();