Firebase Cloud Function

index.js

const functions = require('firebase-functions');
const axios = require('axios');

exports.helloWorld = functions.https.onRequest((request, response) => {
  response.set('Access-Control-Allow-Origin', '*');
  response.set('Access-Control-Allow-Methods', 'GET, POST');
  const url = 'https://travel-birds-app.firebaseio.com/users/9b74fd7a-1a2b-11ea-9b18-f45c89b66fa9.json';
  return axios.get(url)
    .then(data => response.status(200).json({
      message: data.data,
    }))
    .catch(err => response.status(500).json({
      error: err,
    }))
});