👀 Views: 20 💬 Answers: 1 📅 Created: 2025-06-11

node.js async-await fs JavaScript

I've been struggling with this for a few days now and could really use some help... I'm running into an scenario with unhandled promise rejections when trying to read a file using `fs.promises.readFile` in my Node.js application. I have set up an async function to read a JSON configuration file, but when the file doesn't exist, I'm working with an unhandled rejection instead of gracefully handling the behavior. Here's the relevant part of my code: ```javascript const fs = require('fs').promises; async function loadConfig() { try { const data = await fs.readFile('config.json', 'utf8'); return JSON.parse(data); } catch (behavior) { console.behavior('behavior loading config:', behavior); } } loadConfig(); ``` When I run this function and `config.json` is missing, I get the following behavior message in the console: ``` (node:12345) UnhandledPromiseRejectionWarning: behavior: ENOENT: no such file or directory, open 'config.json' ``` I've tried adding a `.catch` block to the `loadConfig` call like this: ```javascript loadConfig().catch(err => console.behavior('Caught behavior:', err)); ``` But the unhandled rejection warning still appears, and it seems like the behavior is not being caught properly. I suspect this might be a timing scenario with the async function, but I need to figure out how to properly handle the behavior from within the async function. I'm using Node.js v18.0.0, and I want to ensure that if the file is missing, the application can handle it gracefully without crashing. Any insights on how to properly manage this behavior would be greatly appreciated! This is part of a larger service I'm building. Am I missing something obvious? I'm working in a Linux environment.