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Attempting to set up static HTML pages using express

I am trying to set up a few pages so that when a user goes to locahost:number/war . They can see the /war page. But when I run the server I get a "Cannot GET war" error on the page. I've set it up similar to this before and didnt have an issue.
I also get a "ReferenceError: __dirname is not defined" issue on the console
import express from 'express';
const app = express();
const router = express.Router();
import path from 'path';
import {getData} from './server.js'
// HTML Routes
router.get('/', (req,res)=> {
res.sendFile(path.join(__dirname, "../start.html"));
})
router.get('/war', (req,res)=> {
res.sendFile(path.join(__dirname, "../index.html"));
})
router.get('/score', (req,res)=> {
res.sendFile(path.join(__dirname, "../finalScore.html"));
})
// Data
export async function sendStats(){
app.get("/data", (req,res)=> {
const data = getData()
res.json(data)
})
app.post("/data",(req, res) => {
const {name, score} = req.body
const data = createData(name, score)
res.json(data)
} )
app.use((err, req, res, next) => {
console.log(err.stack)
res.status(500).send('Something Broke!')
})
app.listen(7171, ()=> {
console.log('Server is running on port 9191')
})
}
const data = await sendStats();

You forgot to load the router in the app:
app.use('/', router)

What does this error mean and how would I fix it: throw new TypeError('app.use() requires a middleware function')?

I am trying to create a login page and sign up page, my app.js gives me this error, I think it is the last line of this code. I can send you the other components(files) for this express app. I cannot understand what is causing this error.
const express = require('express');
const mongoose = require('mongoose');
// Routes
const authRoutes = require('./routes/authRoutes');
const app = express();
// middleware
app.use(express.static('public'));
app.use((err, req, res, next) => {
res.locals.error = err;
res.status(err.status);
res.render('error');
});
// view engine
app.set('view engine', 'ejs');
// database connection
const dbURI = '<database, username and password>';
mongoose.connect(dbURI, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex:true })
.then((result) => app.listen(3000))
.catch((err) => console.log(err));
// routes
app.get('/', (req, res) => res.render('home'));
app.get('/smoothies', (req, res) => res.render('smoothies'));
app.use(authRoutes);
authRoutes.js
const { Router } = require('express')
const authController = require('./authController.js')
const router = Router();
router.get('/signup', authController.signup_get);
router.get('/signup', authController.signup_post);
router.get('/login', authController.login_get);
router.get('/login', authController.login_post);
module.export = router;
authController.js
module.exports.signup_get = (req, res) => {
res.render('signup');
}
module.exports.login_get = (req, res) => {
res.render('login');
}
module.exports.signup_post = (req, res) => {
res.send('signup');
}
module.exports.login_post = (req, res) => {
res.send('login');
}

You are exporting incorrectly in authRoutes.js.
Change this:
module.export = router;
to this:
module.exports = router;
FYI, a little debugging on your own by simply doing a console.log(authRoutes) should have been able to show you where to look for the problem. If you get an error when you attempt to use authRoutes, you look at what it is and where it came from to see why it's not working. This is basic debugging and there is an expectation that you've done basic debugging before you post your question here.

Parameter express can't be passed with require

app.js
const express = require("express");
const app = express();
app.use("/", require("./routers.js")(app));
app.listen(3000);
router.js
module.exports = function (app) {
console.log(app);
app.get("/", (req, res) => {
res.json(5);
});
};
The error given by the Console is: " TypeError: Router.use() requires a middleware function but got an undefined "
I don't understand why I can't pass the express app(app.js) through routers( in this way I don't redeclare the express and app variable in router.js ).

Don't pass app to routes better to create a new router and pass to the app.
router.js
const express = require("express");
const router = express.Router();
router.get("/", (req, res) => {
res.json(5);
});
module.exports = router;
app.js
app.use("/", require("./routers.js"));
As you mention in the comment, you don't have to add an inside app.use
module.exports = function (app) {
app.get("/", (req, res) => {
res.json(5);
});
};
// app.js
require("./routers.js")(app);

The use method of Express needs a callback of three parameters, not the app itself, so you need something like this:
In routes.js
exports.doSomeThing = function(req, res, next){
console.log("Called endpoint");
res.send("Called endpoint");
}
In your index.js
const Express = require("express");
const app = Express();
const routes = require("./routes");
app.use("/", routes.doSomeThing);
app.listen(3030, () => {
console.log("Listening on port 3030");
});
This approach doesn't need to include the express router but this may not be adecuate for big scale projects I recommend you to read express router documentation:
https://expressjs.com/es/guide/routing.html#express-router

Express - set routes in one routes

index.js
app.use('/',wowYeah);
app.use('/lol',wow);
how to use only
routes.js
app.use('/',wowYeah);
app.use('/lol',wow);
app.use(routes());
but it can't
how to do it?
1 app use for all routes

// birds.js file
const express = require('express')
const router = express.Router()
// middleware that is specific to this router
router.use(function timeLog (req, res, next) {
console.log('Time: ', Date.now())
next()
})
// define the home page route
router.get('/', function (req, res) {
res.send('Birds home page')
})
// define the about route
router.get('/about', function (req, res) {
res.send('About birds')
})
module.exports = router
// index.js file
const birds = require('./birds')
// ...
app.use(birds)
for more look documentation.

express.js - single routing handler for multiple routes

I'm currently building an app and I have a routes file that looks like this.
const router = require('express').Router();
router.get('/', (req, res) => res.render('statics/home'));
router.get('/jobs', (req, res) => res.render('statics/jobs'));
router.get('/about-page', (req, res) => res.render('statics/about-page'));
router.get('/valves', (req, res) => res.render('statics/valves'));
router.all('*', (req, res) => res.notFound());
module.exports = router;
I am trying to figure out a way to refactor my routes and have a single route that accepts any string and then checks to see if a file exists matching it
Any help appreciated!

To easily handle static file, you can use express static, express will automatic route all file inside static folder
app = require('express')();
app.use('statics',express.static('statics'));

Something like this could work:
const router = require('express').Router();
const fs = require('fs');
router.get(':template', (req, res) => {
const tpl = req.param('template');
if (tpl) {
if (fs.existsSync('/path/to/templates/' + tpl + '.ext')) { // adjust the path and template extension
res.render('statics/' + tpl);
} else {
res.notFound();
}
} else {
res.render('statics/home');
}
});
router.all('*', (req, res) => res.notFound());
module.exports = router;
Or probably better approach would be to read the templates directory once and create routes based on its contents:
const router = require('express').Router();
const fs = require('fs');
const templates = fs.readdirSync('/path/to/templates');
templates.forEach(tpl => {
tpl = tpl.substring(tpl.lastIndexOf('/') + 1);
if (tpl === 'home') {
router.get('/', (req, res) => res.render('statics/home'))
} else {
router.get('/' + tpl, (req, res) => res.render('statics/' + tpl))
}
});
router.all('*', (req, res) => res.notFound());
module.exports = router;