Need help with express.router not working ??

[FireFighter1017]

I'm at the step where you implement the routes using express.router.
If I use "app.get("/"... " in app.js it works fine. But when I try app.use("/", require("./routes/index")) it fails with "GET / 404".
It can't read the route.
Is there is something I'm not doing right?

[FireFighter1017]

Something was definitely not right in the way I built the app.
I ended up using WSL to create a new app from scratch using express-generator and the router finally works.
The only thing I thought was my mistake is that the "app" express object in app.js is not the same object as the "express" object in routes/index.js and that would explain why it not capable of finding a working route for "/".
Even though my declarations were made exactly the same way and in the same sequence Brad shows in his video, I ended up creating two different objects that aren't sharing the same express instance.

I have seen other people complining about similar issues and that recreating the app would solve it.
I tried several times, both on Windows and on Ubuntu WSL.

The one that worked for me was using express-generator in a Ubuntu WSL session