Tweet Scraper in Node.JS

app.js

var Twitter = require('node-tweet-stream')
    , t = new Twitter({
    consumer_key: '',
    consumer_secret: '',
    token: '',
    token_secret: ''
});
var watch = [
    "SB52",
    "SBLII",
    "SuperBowl",
    "sb52",
    "Superbowl",
    "SuperBowlLII",
    "SuperBowlLll",
    "sblii",
    "SuperBowl2018",
    "superbowl",
    "sb2018"];
var fs = require('fs');
var ndjson = require('ndjson');
var tweet_count = 0;
var serialize = ndjson.serialize();
serialize.on('data', function(line) {
        fs.appendFile('data.json', line, function (err) {
                tweet_count = tweet_count + 1;
                console.log(tweet_count)
        });
});
t.on('tweet', function (tweet) {
        serialize.write(tweet);
});
watch.forEach(function(tag) {
        t.track(tag);
        console.log(tag);
});

package.json

{
  "name": "stream-tweets-to-ndjson",
  "version": "1.0.0",
  "description": "Stream tweets matching an array for hashtags to an ndjson file.",
  "main": "app.js",
  "dependencies": {
    "fs": "^0.0.1-security",
    "ndjson": "^1.5.0",
    "node-tweet-stream": "^2.0.3"
  },
  "keywords": [
    "ndjson",
    "twitter",
    "tweets"
  ],
  "author": "Matt Sandy",
  "license": "ISC"
}