Mongodb 连接问题 - .env 连接问题

Question

我面临 MongoDB 连接错误。我已经在 MongoDB 上创建了集群，并且已在 DB_LINK 的 .env 文件中添加了连接字符串。尽管如此，我仍然面临着下面给出的问题。

这些是我在运行 server.js 文件时遇到的错误

Server is listening on PORT undefined
error MongooseError: The `uri` parameter to `openUri()` must be a string, got "undefined". Make sure the first parameter to `mongoose.connect()` or `mongoose.createConnection()` is a string.
    at Connection.openUri (f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\node_modules\mongoose\lib\connection.js:695:11)
    at f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\node_modules\mongoose\lib\index.js:414:10
    at f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\node_modules\mongoose\lib\helpers\promiseOrCallback.js:41:5
    at new Promise (<anonymous>)
    at promiseOrCallback (f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\node_modules\mongoose\lib\helpers\promiseOrCallback.js:40:10)
    at Mongoose._promiseOrCallback (f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\node_modules\mongoose\lib\index.js:1288:10)
    at Mongoose.connect (f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\node_modules\mongoose\lib\index.js:413:20)
    at connectDB (f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\backend\db\connectDB.js:7:10)
    at Object.<anonymous> (f:\fyp related projects\MERN-Ecommerce-CricketWeapon-Store-master\backend\server.js:18:1)
    at Module._compile (node:internal/modules/cjs/loader:1226:14)

这是我的 server.js 文件，位于后端目录中

const app = require("./app");
const dotenv = require("dotenv");
const connectDB = require("./db/connectDB")
const cloudinary = require("cloudinary");

// Handling Uncaught Execption => anything not defind Uncaught Execption 

process.on("uncaughtException" , (err) =>{
    console.log(`Error , ${err.message}`);
    console.log(`Shutting down the server due to Uncaught Exception`);
    process.exit(1);
})


//config =>
 dotenv.config({path : "backend/config/config.env"})
// Connect With MongoDB
connectDB();


// conncet with cloudinary

cloudinary.config({
  cloud_name: process.env.CLOUDINARY_NAME,
  api_key: process.env.API_KEY,
  api_secret: process.env.API_SECRET,
});

const PORT = process.env.PORT || 5000;

const server = app.listen(PORT, () => {
  console.log(`Server is listening on PORT ${process.env.PORT}`);
});

// Unhandled Promise Rejection  => server issue
process.on("unhandledRejection" , (err) =>{ 
    console.log(`Error : ${err.message}`);
    console.log(`Shutting down the server due to Unhandled Promise Rejection`);
// if there any issue occures eg : broken host link eg : then return msg and server will close
server.close(() =>{
    process.exit(1);
})
    
})

我的后端目录中有一个名为 config 的目录，其中存在我的 .env 文件

Answer 1

问题已经解决了。 .env 文件命名不正确