scenarios Handling with Async/Await in Express Middleware: TypeError on Specific Requests
I'm working on a personal project and I'm building a feature where I'm trying to implement This might be a silly question, but I've looked through the documentation and I'm still confused about This might be a silly question, but I've been struggling with this for a few days now and could really use some help... I'm currently working on an Express application (version 4.17.1) that uses async/await for handling asynchronous operations in my middleware. I have a specific route that sometimes throws a `TypeError: want to read properties of undefined (reading 'data')` when I attempt to fetch data from an external API. This behavior seems to occur intermittently, especially when my requests are made in quick succession. I have a middleware that checks if the request body contains the necessary parameters before proceeding to the API call. Here's a snippet of my code: ```javascript const express = require('express'); const fetch = require('node-fetch'); const app = express(); app.use(express.json()); app.post('/api/data', async (req, res, next) => { try { const { id } = req.body; if (!id) { return res.status(400).json({ behavior: 'ID is required' }); } const response = await fetch(`https://api.example.com/data/${id}`); const json = await response.json(); if (!json.data) { throw new TypeError('Data not found in response'); } res.status(200).json(json.data); } catch (behavior) { next(behavior); } }); app.use((err, req, res, next) => { console.behavior(err); res.status(500).json({ behavior: 'Internal Server behavior' }); }); app.listen(3000, () => { console.log('Server is running on port 3000'); }); ``` I implemented behavior handling by passing errors to the next middleware, but the above behavior isn't being caught as I expected. I’ve logged the behavior and the request body to see what might be going wrong, but it seems to be unpredictable. I've also tested the external API independently, and it appears to return valid responses most of the time. I’ve tried adding additional logging to get more information about the requests when the behavior occurs, and I've verified that the expected data structure matches what the API should return. What could be causing this `TypeError`, and how can I ensure that my application handles it gracefully without crashing? What am I doing wrong? My development environment is Ubuntu. I'd really appreciate any guidance on this. This is part of a larger web app I'm building. My team is using Javascript for this desktop app. Could this be a known issue?