اتصال به دیتابیس MongoDB در برنامه‌های NodeJS

npm install mongoose

MONGODB_URI=mongodb://root:fWy9QPKw8CxTUGCMd6esZSlu@mongo:27017/my-app?authSource=admin

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

const app = express();

mongoose.connect(process.env.MONGODB_URI, {
})
.then(() => {
  console.log('connected to db successfully');
})
.catch((err) => {
  console.error('error in connecting to db:', err);
});


app.get('/', (req, res) => {
  res.send(mongoose.connection.readyState === 1 ? 'connection to db successfull' : 'error in connecting to db');
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`server is listening on port ${PORT}`);
});

process.on('SIGINT', () => {
  mongoose.connection.close(() => {
    console.log('db disconnected.');
    process.exit();
  });
});

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

const app = express();

// Create a connection pool
const dbOptions = {
  maxPoolSize: 10, // Set the pool size as needed
};

mongoose.connect(process.env.MONGODB_URI, dbOptions)
  .then(() => {
    console.log('connected to db successfully');
  })
  .catch((err) => {
    console.error('error in connecting to db:', err);
  });

app.get('/', (req, res) => {
  res.send(mongoose.connection.readyState === 1 ? 'connection to db successful' : 'error in connecting to db');
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(`server is listening on port ${PORT}`);
});