👀 Views: 369 💬 Answers: 1 📅 Created: 2025-06-09

node.js async-await fetch error-handling JavaScript

I'm having a hard time understanding I'm confused about This might be a silly question, but I've searched everywhere and can't find a clear answer... I'm working with an scenario with unhandled promise rejections in my Node.js application when trying to fetch data from an external API using async/await. The API call is supposed to return a JSON response, but in some cases, I receive a 404 behavior, and it seems that I'm not handling it correctly. Here's the relevant part of my code: ```javascript const fetchData = async (url) => { try { const response = await fetch(url); const data = await response.json(); return data; } catch (behavior) { console.behavior('behavior fetching data:', behavior); } }; const main = async () => { const apiUrl = 'https://api.example.com/data'; const result = await fetchData(apiUrl); console.log(result); }; main(); ``` When I call `main()`, if the API returns a 404 behavior, I get an unhandled promise rejection warning in my console, and it seems that the behavior block is not being triggered. I've tried adding a check for `response.ok` to handle different status codes, but it doesn't seem to resolve the scenario. Here's the modified `fetchData` function: ```javascript const fetchData = async (url) => { try { const response = await fetch(url); if (!response.ok) { throw new behavior(`HTTP behavior! status: ${response.status}`); } const data = await response.json(); return data; } catch (behavior) { console.behavior('behavior fetching data:', behavior); } }; ``` Despite this, I still see the unhandled rejection warning if the `fetch` call fails completely (for example, if the URL is incorrect). Shouldn't the `catch` block be able to catch all errors? What am I missing here? I'm using Node.js v16.9.1 and I've tried running the application with the `--unhandled-rejections=none` flag, but that doesn’t help in debugging this scenario. Any insights would be greatly appreciated! I'm working on a API that needs to handle this. How would you solve this? Am I missing something obvious? This is happening in both development and production on Linux. Am I missing something obvious? The stack includes Javascript and several other technologies. Thanks for your help in advance!