Get geographic location by querying Google's Geolocation API with Node (Express). Accompanies this brief explainer: https://davidfloyd91.github.io/google-geolocation-api-node-express/

googleGeolocationApiNodeExpress.js

// https://davidfloyd91.github.io/google-geolocation-api-node-express/

const express = require('express');
const https = require('https');
const app = express();
const port = 3000;
let lat, lng;

const googleKey = process.env.GOOGLE_API_KEY;

// $ curl -X POST -H 'Content-Type: application/json' https://www.googleapis.com/geolocation/v1/geolocate?key=$GOOGLE_API_KEY
const googleOptions = {
  hostname: 'www.googleapis.com',
  path: `/geolocation/v1/geolocate?key=${googleKey}`,
  method: 'POST',
  headers: { 'Content-Type': 'application/json' }
};

app.get('/', (req, res) => {
  res.send('Hello World!')
});

// $ curl -X GET -H 'Content-Type: application/json' http://localhost:3000/location
app.get('/location', (req, res) => {
  let data = '';

  const request = https.request(googleOptions, (response) => {
    console.log(`STATUS: ${response.statusCode}`);
    console.log(`HEADERS: ${JSON.stringify(response.headers)}`);
    response.setEncoding('utf8');
    response.on('data', (chunk) => {
      console.log(`BODY: ${chunk}`);
      data += chunk;
    });

    response.on('end', () => {
      console.log('No more data in response.');

      let coords = JSON.parse(data);
      lat = coords.location.lat;
      lng = coords.location.lng;

      res.send(coords);
    });
  });

  request.on('error', (e) => {
    console.error(`problem with request: ${e.message}`);
  });

  request.end();
});

app.listen(port, () => {
  console.log(`Listening on port ${port}!`);
});