How to use a Function for Retry Logic In NodeJS
In this method, we establishes a MongoDB connection using Mongoose and implements retry logic for reconnections. The connectWithRetry
function attempts to connect to the MongoDB database, and if the connection fails, it retries every 5 seconds. Event listeners are set up to log when the connection is established, lost, or reestablished.
const mongoose = require('mongoose');
const connectWithRetry = () => {
console.log('MongoDB connection with retry');
return mongoose.connect(
'mongodb://localhost:27017/mydatabase', {
useNewUrlParser: true,
useUnifiedTopology: true,
}).catch(() => {});
};
mongoose.connection.on('connected', () => {
console.log('MongoDB is connected');
});
mongoose.connection.on('error', (err) => {
console.log(`MongoDB connection error: ${err}`);
setTimeout(connectWithRetry, 5000);
});
mongoose.connection.on('disconnected', () => {
console.log('MongoDB is disconnected');
setTimeout(connectWithRetry, 5000);
});
connectWithRetry();
How to Handle Lost Connection to Mongodb from Nodejs?
Handling lost connections to MongoDB in a Node.js application is crucial for maintaining application reliability and data integrity. However, network issues, database server crashes, or other unexpected events can cause the connection to be lost. This article will guide you through different approaches to handle them, and provide a step-by-step guide to creating a robust application that gracefully manages lost connections.
These are the following approaches:
Table of Content
- Using Mongoose
- Using MongoDB Native Driver
- Using Event Listeners
- Using a Function for Retry Logic