生产中的 Node、Express、Dot 环境错误（Heroku）

Question

我在 Heroku 中部署 MERN 应用时遇到了麻烦。该应用程序在本地机器上正常工作，但在生产中，它一次又一次地给我一个错误。

使用命令node Shoping-Backend/server.js启动进程 /app/node_modules/path-to-regexp/index.js:63 path = ('^' + path + (strict ? '' : path[path.length - 1] === '/' ? '?' : '/?')) TypeError: Cannot read properties of undefined (reading 'length')

在我的 app.js 和 server.js 中没有使用 length。我已经在 Heroku 的网站上声明了所有 ENV。但是还是这个错误

版本

• 节点 v14.17.4
• express@4.17.2
• dotenv@14.2.0

Procfile web: node Shoping-Backend/server.js

我的 app.js 文件

const express = require('express');
const app = express();

const fileUpload = require('express-fileupload');
const bodyParser = require('body-parser');
// const dotenv = require('dotenv'); 
const path = require('path');
const cookieParser = require("cookie-parser");
const cors = require('cors');
const morgan = require('morgan');
const errorMiddleware = require('./middlewares/errors/errors');

// setting up config files  // if this then why giving me error
if (process.env.NODE_ENV !== 'PRODUCTION') require('dotenv').config({ path: 'shoping-backend/config/config.env' }); 


app.use(express.json({ limit: "50mb" }));
app.use(express.urlencoded({ limit: "50mb", extended: true }));
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(fileUpload());



const bassurl = process.env.BASS_URL // api/v1


// emport routes 
const product = require('./route/product');
const userRoute = require('./route/auth');
const orderRoute = require('./route/order');
const paymentRoute = require('./route/payment');


// middlewares 
app.use(morgan('dev'));
// app.use(cors());
app.use(cors({
     origin: 'http://localhost:3000',
     credentials: true,
     // allowedHeaders: 'Origin, X-Requested-With, Content-Type, Accept'
}));
// app.set('trust proxy', 1);

// endpoints 
// app.get('/',(req,res)=>{
//      res.status(200).json({message:'ok find it!!!'})
// });
app.use(bassurl, product);
app.use(bassurl, userRoute);
app.use(bassurl, orderRoute);
app.use(`${bassurl}/payment`, paymentRoute)


// add front static files
// if (process.env.NODE_ENV === 'PRODUCTION') {
app.use(express.static(path.join(__dirname, '../shoping_front/build')));

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

// error middlewares
app.use(errorMiddleware)

module.exports = app;

我的 server.js 文件

const app = require('./app');
const connectToDatabase = require('./config/database');
const cloudinary = require('cloudinary');

// handle Uncaught exceptions Error (undefind verialbe or values)
process.on('uncaughtException', err => {
     console.log(`ERROR NAME: ${err.name} -> ERROR: ${err.stack}`);
     console.log('Shutting down the server due to Uncaught exceptions (undefind verialbe)');
     process.exit(1);
});
// setting up config files // if this then why giving me error
if (process.env.NODE_ENV !== 'PRODUCTION') require('dotenv').config({ path: 'shoping-backend/config/config.env' });

const PORT = process.env.PORT || 8080;

// Database conection
connectToDatabase();

// config cloudinary
cloudinary.config({
     cloud_name: process.env.CLOUDINARY_CLOUD_NAME,
     api_key: process.env.CLOUDINARY_API_KEY,
     api_secret: process.env.CLOUDINARY_API_SECRET
});

// listen
const server = app.listen(PORT, () => {
     console.log(`server started on PORT ${PORT} as ${process.env.NODE_ENV} mode.`);
});

// handle unhandledRejection Error
process.on('unhandledRejection', err => {
     console.log(`ERROR NAME: ${err.name} -> ERROR: ${err.message}`);
     console.log('Shutting down the server due to Unhandled Promisse rejection');
     server.close(() => process.exit(1));
});   

如果我已经声明了所有 ENV 那么为什么会出现这个错误？

Answer 1

您的 Procfile 定义有一个到 server.js 文件的路由，您应该改用一个到 app.js 文件的路由。