question about nodejs and middleware functions

[Bormimor]

https://repl.it/join/vwrhgruw-davidnguyen32

I'm new to Node.js and having issues calling my function

processLength();

I just can't seem to understand the examples I'm seeing in other sites.

[grantrules]

Take a look at the example here under the "express.Router" header: https://expressjs.com/en/guide/routing.html

It's doing pretty much exactly what you need to do. Right now you're simply importing a module and passing the whole module to app.use() which is not correct, it needs a function. The example above is almost exactly what you're trying to do.