sqlite or Sequlize seems to have broken my app

I have a node js app that doesn't work since I installed packages sqlight or sequlize.

This is my index.js file:

var express = require('express'),
    app = express();

app.get('/', (req, res) =>{
    res.send('hello world');
});

I put runjs index.js in my terminal, response: Starting: index.js, theese are my dependencies:

  "dependencies": {
    "express": "^4.13.4",
    "passport": "^0.3.2",
    "passport-facebook-token": "^3.2.0",
    "passport-local": "^1.0.0",
    "sequelize": "^3.23.3",
    "sqlite3": "^3.1.4"
  }

Visiting localhost:3000 renders the response

This site can’t be reached – ERR_CONNECTION_REFUSED

What might cause this?