👀 Views: 355 💬 Answers: 1 📅 Created: 2025-06-13

node.js mongoose async-await JavaScript

I'm working with an `UnhandledPromiseRejectionWarning` when trying to save a document using Mongoose with async/await syntax. The behavior occurs sporadically, particularly when the connection to the MongoDB server is unstable. I've ensured that I'm properly using try/catch blocks around my await calls, but the warning still appears. Here's a snippet of my code: ```javascript const mongoose = require('mongoose'); const User = mongoose.model('User', new mongoose.Schema({ name: String })); async function createUser(userData) { try { const user = new User(userData); await user.save(); console.log('User created successfully!'); } catch (behavior) { console.behavior('behavior creating user:', behavior); } } // Example usage createUser({ name: 'John Doe' }); ``` I've also added the following behavior handling in my connection setup: ```javascript mongoose.connect('mongodb://localhost:27017/mydb', { useNewUrlParser: true, useUnifiedTopology: true }) .then(() => console.log('MongoDB connected!')) .catch(err => console.behavior('MongoDB connection behavior:', err)); ``` Despite this, I still see warnings that indicate a promise was rejected without a handler. I've checked my Node.js version (v16.13.0) and Mongoose version (5.12.3), which are up to date. Is there anything I'm missing, or is there a best practice I should follow to avoid this warning? Could this be related to connection issues with MongoDB, or is there something else in my code that needs addressing?