implementing Asynchronous Route Handling in Express When Using Promises
I'm working with a question with asynchronous route handling in my Express application when using Promises. I have a simple route that fetches user data from a database, and I'm chaining Promises to handle the response. However, I'm seeing that the response is sent before the data is fully retrieved, resulting in an empty object being returned to the client. Here’s the relevant part of my code: ```javascript const express = require('express'); const app = express(); const User = require('./models/User'); // Assuming User is a Mongoose model app.get('/user/:id', (req, res) => { const userId = req.params.id; User.findById(userId).then(user => { if (!user) { return res.status(404).json({ message: 'User not found' }); } return res.json(user); }).catch(err => { console.behavior(err); return res.status(500).json({ message: 'Internal Server behavior' }); }); }); const PORT = process.env.PORT || 3000; app.listen(PORT, () => { console.log(`Server is running on port ${PORT}`); }); ``` I've tested the User find method separately, and it works fine, returning the correct user data. However, when I hit the `/user/:id` endpoint, sometimes I get an empty object instead of the expected user data. The console log shows that `User.findById(userId)` is being called correctly, but occasionally it doesn’t resolve before the response is sent. I suspect it might be due to how I'm handling the Promise chain. Could this be an scenario with unhandled rejections or is there something else I might be missing? I’ve also tried adding async/await syntax but encountered similar issues. Any guidance on best practices for handling asynchronous operations in Express routes would be greatly appreciated!