server.js

const express = require("express");
const Twitter = require("twitter");
const app = express();
const dotenv = require("dotenv");

dotenv.config({ path: "./config.env" });

var client = new Twitter({
  consumer_key: process.env.CONSUMER_KEY,
  consumer_secret: process.env.CONSUMER_SECRET,
  access_token_key: process.env.ACCESS_TOKEN_KEY,
  access_token_secret: process.env.ACCESS_TOKEN_SECRET
});

app.get("/tweets", function(req, res) {
  var params = {
    screen_name: "nasa",
    trim_user: true,
    exclude_replies: true,
    include_rts: false,
    count: 200
  };

  client.get("statuses/user_timeline", params, function(error, tweets, res) {
    if (!error) {
      console.log({ tweets });
      console.log(tweets[0].text);
    } else {
      console.log({ error });
    }
  });
});

const port = process.env.PORT || 4000;

//listen on localhost:4000
app.listen(port, () => console.log(`Server started on port ${port}`));