Code on gitlab: https://gitlab.com/test-projects47/firestore-import-json

Creating a Firestore database

1. Register for a firebase account and go to Firebase Console (console.firebase.google.com)

2. Add Project

   

3. Click Continue when the project is ready, which takes you back to the console

   

4. Add a new app (Web app in this case) to the project

   

5. Copy firebaseConfig in the next screen for later use.

   

6. Continue to console

7. Click into Cloud Firestore and create a database

   

   

8. Pick a mode and select a region and "Enable"

   

   

Setup a service account

1. We will authenticate the app using a service account key.

   Read more about Google Authentication here - Authentication at Google (Principal)

2. Go to the Service account page ( Project Overview -> settings -> users and permissions ->service accounts)

   

   

3. "Generate new private key", which will save a JSON file to your computer

The Code

https://gitlab.com/test-projects47/firestore-import-json

1. start a new node.js project

yarn init

2. Add dependencies

yarn add firebase-admin
yarn add dotenv

1. Include the following files in the folder

   data.json - your data in json format

   *-firebase-adminsdk-*.json - google service account private key json file

   .env - environment variables

2. In the .env file, put the path of the service account private key in the variable GOOGLE_APPLICATION_CREDENTIALS

    GOOGLE_APPLICATION_CREDENTIALS="./*-firebase-adminsdk-*.json"
   

3. (Optional) Firebase config variables in .env

    FIREBASE_PUBLIC_API_KEY=""
    FIREBASE_AUTH_DOMAIN=""
    FIREBASE_PROJECT_ID=""
    FIREBASE_APP_ID=""
    FIREBASE_MESSAGING_SENDER_ID=""
    FIREBASE_STORAGE_BUCKET=""
   

4. Here (index.js) we insert the data in data.json into a collection called "users", with an automatically generated document id.

   db.collection('users').doc();

    // index.js
    const { initializeApp } = require('firebase-admin/app');
    const { getFirestore } = require('firebase-admin/firestore');
    require('dotenv').config();
    const data = require('./data.json');
   
    const firebaseConfig = {
      apiKey: process.env.FIREBASE_PUBLIC_API_KEY,
      authDomain: process.env.FIREBASE_AUTH_DOMAIN,
      projectId: process.env.FIREBASE_PROJECT_ID,
      storageBucket: process.env.FIREBASE_STORAGE_BUCKET,
      messagingSenderId: process.env.FIREBASE_MESSAGING_SENDER_ID,
      appId: process.env.FIREBASE_APP_ID,
    };
   
    const app = initializeApp(firebaseConfig);
    const db = getFirestore(app);
   
    const importJSON = async () => {
      for await (const user of data) {
        db.collection('users').doc().set(user);
      }
    };
   
    importJSON();
   

   data.json looks like this

    [  {"id":1,"first_name":"Maudie","last_name":"Ivakin","email":"mivakin0@npr.org"},
    {"id":2,"first_name":"Boonie","last_name":"Navarro","email":"bnavarro1@tamu.edu"},
    {"id":3,"first_name":"Elden","last_name":"MacCafferky","email":"emaccafferky2@mashable.com"}
    ]
   

5. run the code

    node index.js