simpleServer.js

// grab the packages we need
const express = require('express');
const app = express();
const faker = require('faker');
const port = process.env.PORT || 3000;

const nResponses = 1000;

const TYPES = {
    WORKER: 'WORKER',
    COP: 'COP',
    TEACHER: 'TEACHER'
};

TYPES.getRandom = function() {
    const keys = Object.keys(this);
    return this[keys[Math.floor(Math.random() * (keys.length - 1))]];
}

const TYPE_TOOLS = {
    WORKER: ['hammer', 'nail', 'ladder', 'helmet', 'screwdriver', 'swiss knife', 'boots'],
    COP: ['uniform', 'taser', 'pistol', 'police hat', 'badge', 'whistle'],
    TEACHER: ['marker', 'book', 'notebook', 'tablet', 'papers', 'tie']
};

class UserMetaData {
    constructor(type) {
        this.type = type;
        this.tools = TYPE_TOOLS[type];
    }
}

class User {
    constructor(index, type) {
        this.id = `${index}-${new Date().getTime()}`;
        this.name = faker.name.firstName() + ' ' +faker.name.lastName();        
        this.email = faker.internet.email();

        this.metaData = new UserMetaData(type);
    }
}

class FlyWeightUser {
    constructor(index, type) {
        this.id = `${index}-${new Date().getTime()}`;
        this.name = faker.name.firstName() + ' ' +faker.name.lastName();        
        this.email = faker.internet.email();

        this.type = type;
    }
}

function generateData(userClass) {
    let users = [];

    for (let i = 0; i < nResponses; i++) {
        users.push(new userClass(i, TYPES.getRandom()));
    }

    return users;
}

// routes will go here
app.post('/getData', function(req, res) {
    res.send(generateData(User));
});

app.post('/getFlyWeightData', function(req, res) {
    res.send({data: generateData(FlyWeightUser), TYPE_TOOLS});
});

app.use(express.static('dist'));

// start the server
app.listen(port);
console.log('Server started! At http://localhost:' + port);