Write json file to Firebase with Node.js?

Question

I have a third party API that I need to call every 5 seconds. I get JSON as response, and I'd like to write the JSON content to a Firebase node using Node.js. Based on Firebase examples I could import data with this code:

var usersRef = ref.child("users");
usersRef.set({
  alanisawesome: {
    date_of_birth: "June 23, 1912",
    full_name: "Alan Turing"
  },
  gracehop: {
    date_of_birth: "December 9, 1906",
    full_name: "Grace Hopper"
  }
});

Curl examples worked too. But what I really wanted to do is to import a third party API response directly to my Firebase database using the API endpoint. How can i do it with Node.js?

David · Accepted Answer · 2017-06-24 22:06:36Z

5

First, you need to make a request to the api endpoint and receive the data. Then, you can send that json data to firebase

var request = require('request');

var usersRef = ref.child("users");

request('<your_endpoint>', function (error, response, body) {
  if (!error && response.statusCode == 200) {
    var asJson = JSON.parse(body)
    usersRef.set(asJson)
   }
})

answered Jun 24, 2017 at 22:06

David

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Comments

Shane Kenyon · Accepted Answer · 2018-10-05 15:46:10Z

I ran into a lot of little "gotchas" implementing the sample node.js code from the Firebase docs. Below is a fully working code set correcting all the issues which will run as a Google Cloud Platform function (node.js v8 - async/await will not work in v6):

const admin = require('firebase-admin');
// You need this library in order to use firebase in functions
const functions = require('firebase-functions');

/**
 * Responds to any HTTP request.
 *
 * @param {!express:Request} req HTTP request context.
 * @param {!express:Response} res HTTP response context.
 */
exports.uploadFile = async (req, res) => {

  // Check if firebase is already initialized, per: https://maxrohde.com/2016/09/21/test-if-firebase-is-initialized-on-node-js-lambda/
  if (admin.apps.length === 0) {
    admin.initializeApp(functions.config().firebase);
  }

  var db = admin.firestore();
  var message = '';

  createUsers(db);
  message = await getUsers(db);

  res.status(200).send('Database content:\n' + message);
};

// Write data in a function so you can wait for all the Promises to complete and return per: https://github.com/firebase/functions-samples/issues/78
function createUsers(db) {
  var docRef = db.collection('users').doc('alovelace');

  var setAda = docRef.set({
    first: 'Ada',
    last: 'Lovelace',
    born: 1815
  })
  .catch((err) => {
    console.log('Error writing document', err);
  });

  var aTuringRef = db.collection('users').doc('aturing');

  var setAlan = aTuringRef.set({
    'first': 'Alan',
    'middle': 'Mathison',
    'last': 'Turing',
    'born': 1912
  })
  .catch((err) => {
    console.log('Error writing document', err);
  });

  return Promise.all([setAda, setAlan]);
}

async function getUsers(db) {
  var message = '';
  await db.collection('users').get()
    .then((snapshot) => {
      snapshot.forEach((doc) => {
        // You need to stringify doc.data() if you want to render it outside of a console.log()
        message += '\n' + doc.id + '=>' + JSON.stringify(doc.data());
      });
    })
    .catch((err) => {
      console.log('Error getting documents', err);
    });

    return message;
}

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