/*Express Server*/
    const express = require('express');
    const app = express();
    const morgan = require('morgan');
    const path = require('path');
    const bodyParser = require('body-parser');

    const { mongoose } = require('./database');

    //settings
    app.set('port', process.env.PORT || 3000);

    //middleware
    app.use(morgan('dev'));
    app.use(bodyParser.urlencoded({ extended: true }));
    app.use(bodyParser.json());

    //routes
    app.use('/api/month',require('./routes/monthly.routes'));

    app.use('/history',require('./routes/history.routes'));

    //static files
    app.use(express.static(path.join(__dirname, 'public')))

    app.get(async (req,res)=>{
        await res.sendFile(path.join(__dirname, '/public/index'), (err)=> {
        if (err) {
          res.status(500).send(err)
        }
    })
    });

    //Start server
    app.listen(app.get('port'), ()=>{
        console.log(`Server listening on ${app.get('port')}`);
    });

import React, { Component } from 'react';
    import ReactDom from 'react-dom';
    import { BrowserRouter, Route, Switch } from 'react-router-dom';
    import Axios from 'axios';

    import Home from './Home'
    import Latest from './Latest'

    class App extends Component {
        constructor(props) {
            super(props);
            this.state = {
                RecentExpenses: [],
                monthState: null,
                Total: 0,
                Today: null
            }
        };

        render() {
            return (
                    <BrowserRouter>
                        <Switch>
                            <Route exact path='/' render={(props) => <Home {...props} Today={this.state.Today} Total={this.state.Total} RecentExpenses={this.state.RecentExpenses} />}  />
                            <Route exact path='/history' render={(props) => <Latest {...props} Recent={this.state.RecentExpenses} month={this.state.monthState} />} />
                        </Switch>
                    </BrowserRouter>
            )
        }
    }

    ReactDom.render(<App/>, document.getElementById('app'));

(node:8756) UnhandledPromiseRejectionWarning: Error: Cannot find module 'html'
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:571:15)
at Function.Module._load (internal/modules/cjs/loader.js:497:25)
at Module.require (internal/modules/cjs/loader.js:626:17)
at require (internal/modules/cjs/helpers.js:20:18)