an error while connecting node js with mongoDB

Question

In the Backend folder, I created a server.js file.

const express = require('express');
const cors = require('cors');
const mongoose = require('mongoose');

require('dotenv').config();

const app = express();
const port = process.env.PORT || 5000;

app.use(cors());
app.use(express.json());

//connect with mongoDB
const uri = process.env.ATLAS_URI;
mongoose.connect(uri, { useNewUrlParser: true, useCreateIndex: true }
);
const connection = mongoose.connection;
connection.once('open', () => {
  console.log("MongoDB database connection established successfully");
})

//import routes
//const exercisesRouter = require('./routes/exercises');
//const usersRouter = require('./routes/users');

//use routes
//app.use('/exercises', exercisesRouter);
//app.use('/users', usersRouter);

app.listen(port, () => {
    console.log(`Server is running on port: ${port}`);
});

after I entered nodemon server command.

Here What printed in the terminel

[nodemon] 2.0.20 [nodemon] to restart at any time, enter rs [nodemon] watching path(s): . [nodemon] watching extensions: js,mjs,json [nodemon] starting node server.js (node:92140) [MONGOOSE] DeprecationWarning: Mongoose: the strictQuery option will be switched back to false by default in Mongoose 7. Use mongoose.set('strictQuery', false); if you want to prepare for this change. Or use mongoose.set('strictQuery', true); to suppress this warning. (Use node --trace-deprecation ... to show where the warning was created) node:events:491 throw er; // Unhandled 'error' event ^

Error: listen EADDRINUSE: address already in use :::5000 at Server.setupListenHandle [as _listen2] (node:net:1733:16) at listenInCluster (node:net:1781:12) at Server.listen (node:net:1869:7) at Function.listen (/Users/masterlwa/Desktop/exercise-tracker/backend/node_modules/express/lib/application.js:635:24) at Object. (/Users/masterlwa/Desktop/exercise-tracker/backend/server.js:32:5) at Module._compile (node:internal/modules/cjs/loader:1218:14) at Module._extensions..js (node:internal/modules/cjs/loader:1272:10) at Module.load (node:internal/modules/cjs/loader:1081:32) at Module._load (node:internal/modules/cjs/loader:922:12) at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) Emitted 'error' event on Server instance at: at emitErrorNT (node:net:1760:8) at process.processTicksAndRejections (node:internal/process/task_queues:82:21) { code: 'EADDRINUSE', errno: -48, syscall: 'listen', address: '::', port: 5000 }

Node.js v18.13.0 [nodemon] app crashed - waiting for file changes before starting...

Currently, I do not have an idea regarding how to fix this. How to fix this?

port 5000 that you are using to run your express app is already occupied by other process in your system. Once try changing port number. — Drashti Kheni
– Drashti Kheni, Commented Feb 7, 2023 at 3:56

Phonekham Dev · Accepted Answer · 2023-02-07 04:00:13Z

0

seems like port 5000 is alreay in used by another app, try to change port to 5001 or something else

answered Feb 7, 2023 at 4:00

Phonekham Dev

16

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