server.js

var Twit = require('twit')
var twitter = new Twit({
    consumer_key: '',
    consumer_secret: '',
    access_token: '',
    access_token_secret: '',
    timeout_ms: 60 * 1000, // optional HTTP request timeout to apply to all requests.
    strictSSL: true, // optional - requires SSL certificates to be valid.
})

var GoogleSheets = require('google-drive-sheets');
// spreadsheet key is the long id in the sheets URL
var mySheet = new GoogleSheets('1BHW2ZpMtEW3AVcJvVxQiquQIBKpTmcjq_oc9omvkPXo');
// Without auth -- read only
// IMPORTANT: See note below on how to make a sheet public-readable!
// # is worksheet id - IDs start at 1
mySheet.getRows(1, function(err, rowData) {
    console.log('Pulled in ' + rowData.length + ' rows from Google Sheets');

    for (i = 0; i < rowData.length; i++) {
        var twitterhandle = rowData[i].twitterhandle
        twitter.get('users/show', {screen_name: twitterhandle}, function(err, data, response) {

            Object.assign(data, {specialism: specialism});
            // server app that updates bits of list from twitter, then make it save as a json
            const mongo = require('mongodb').MongoClient;
            const url = 'mongodb://192.168.1.150:32771';
            mongo.connect(url, (err, client) => {
                if (err) {
                    console.error(err)
                    return
                }

                const db = client.db('twitterteachers')
                collection = db.collection('teachers')

                key = {'_id':data.id_str}

                collection.update(key, data, {upsert:true})
            })
        })
    }
});