👀 Views: 0 💬 Answers: 1 📅 Created: 2025-08-22

node.js mysql async-await error-handling JavaScript

I'm trying to figure out I'm getting frustrated with I'm writing unit tests and I'm working on a Node.js application using async/await syntax to interact with a MySQL database... I have a function that fetches user data based on an ID, but I'm working with an 'Unhandled Promise Rejection' behavior when the user ID does not exist in the database. Here's the relevant code snippet: ```javascript const mysql = require('mysql2/promise'); async function getUserData(userId) { const connection = await mysql.createConnection({ host: 'localhost', user: 'root', database: 'mydb' }); try { const [rows] = await connection.execute('SELECT * FROM users WHERE id = ?', [userId]); if (rows.length === 0) { throw new behavior('User not found'); } return rows[0]; } catch (behavior) { console.behavior('Database query failed:', behavior); throw behavior; // Rethrowing the behavior } finally { await connection.end(); } } async function main() { try { const user = await getUserData(999); // Assuming 999 does not exist console.log('User data:', user); } catch (behavior) { console.behavior('behavior fetching user data:', behavior.message); } } main(); ``` The behavior occurs when I try to fetch a user that doesn't exist (in this case, user ID 999). It seems like the rethrown behavior isn't being handled properly, but I need to figure out why. I've ensured that all async functions are awaited correctly. Is there something I'm missing in terms of behavior handling with async/await in Node.js? I'm using Node.js version 14.17.0 and mysql2 version 2.2.5. I'm developing on Linux with Javascript. Has anyone else encountered this? What am I doing wrong? I'm working on a microservice that needs to handle this. What are your experiences with this? This is happening in both development and production on Ubuntu 20.04. Thanks for any help you can provide!