Node.js Express Middleware Not Executing in Proper Order with Async/Await
I'm working on an Express.js application (version 4.17.1) where I've set up multiple middleware functions. However, I'm running into an scenario where my middleware functions are not executing in the order I expect when using async/await. I'm trying to implement a sequence of logging, authentication, and then a final handler for a route. Here’s a simplified version of my code: ```javascript const express = require('express'); const app = express(); const logger = async (req, res, next) => { console.log('Request:', req.method, req.url); next(); }; const authenticate = async (req, res, next) => { const token = req.headers['authorization']; if (token) { // Simulate async operation await new Promise(resolve => setTimeout(resolve, 100)); console.log('Authenticated!'); next(); } else { res.status(401).send('Unauthorized'); } }; const finalHandler = (req, res) => { res.send('Hello from final handler'); }; app.use(logger); app.use(authenticate); app.get('/', finalHandler); app.listen(3000, () => { console.log('Server is running on port 3000'); }); ``` When I make a request to the root endpoint (`/`), I notice that the logs sometimes appear out of order, or the authentication step seems to be skipped intermittently, which leads to 401 errors without logging. I've tried adding `await` before calling the `next()` function in `authenticate`, but that results in a 'next is not a function' behavior. I’ve also confirmed that the async operations are resolving correctly. I would really appreciate any insight into why the middleware might not be executing in the desired order or how I can ensure that the middleware logic executes correctly in a sequence.