在server.js节点上本地工作
Image of folder
服务器. js代码：

const express = require('express');
const path = require('path');
const db = require('./db/db.json'); //*db = database
const PORT = process.env.PORT || 3001;
const app = express();

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

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

app.get('/*/', (req, res) => {
    res.sendFile(path.join(__dirname), './public/index.html')
})

//TEXT EDIT: this is at the bottom of the server.js
app.listen(PORT, () => {
    console.log(`Port is live http://localhost:3001`)
})

package.json:

{
  "dependencies": {
    "express": "^4.18.1"
  },
  "scripts": {
    "start": "node Develop/server.js"
  }
}

已经花了近4个小时的堆栈溢出尝试所有的解决方案提出了类似的问题。
heroku logs