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req.body is undefined in REST API using Express JS,

I am trying to create a REST API using Express JS.
console.log(req.body) gives undefined as output,
this is my code in routes.js page
const express = require('express');
const router = express.Router();
router.post('/post',async (req,res) => {
console.log("inside post router");
console.log(req.body);
const data = new Model({
name: req.body.name,
age: req.body.age
})
try {
const dataToSave = await data.save();
res.status(200).json(dataToSave)
}
catch(error) {
res.status(400).json({message:error.message})
}
})
This is the code in index.js file
const express = require('express');
const mongoose = require('mongoose');
const routes = require('./Routes/routes');
const app = express();
app.use('/api',routes);

User middlewares ,for parsing the post body in your index.js file
const express = require('express');
const mongoose = require('mongoose');
const routes = require('./Routes/routes');
const app = express();
app.use(express.json()) ; //parsing application/json
app.use(express.urlencoded({extended: false}) ;
app.use('/api',routes);
Make sure to use them ,before you configure your routes
See reference

Failed to load module script: expected a javascript module script but server responded with a MIME type of text/jsx

Ive created an express server and created an api and also ive installed react through vite for my frontend. when I try to connect or load my main html file to the server the console gives that error. Im new to express
Here's My express app code
const express = require("express");
const dotenv = require("dotenv");
const errorMiddleware = require("./middleware/error");
const cookieParser = require("cookie-parser");
const fileupload = require("express-fileupload");
const app = express();
const bodyParser = require("body-parser");
const cors = require("cors");
const path = require("path");
//config for env file
dotenv.config({ path: `${__dirname}/config/config.env` });
app.use(cors());
app.use(express.json({ limit: "50mb" }));
app.use(bodyParser.urlencoded({ limit: "50mb" }));
app.use(cookieParser());
app.use(fileupload());
// Route Imports
const productRoutes = require("./routes/productRoutes");
const userRoutes = require("./routes/userRoutes");
const orderRoutes = require("./routes/orderRoute");
const paymentRoute = require("./routes/paymentRoute");
//using all routes
app.use("/api/v1", productRoutes);
app.use("/api/v1/user", userRoutes);
app.use("/api/v1", orderRoutes);
app.use("/api/v1", paymentRoute);
app.use(express.static(path.join(__dirname, "../frontend")));
app.get("*", (req, res) => {
res.sendFile(path.resolve(__dirname, "../frontend/index.html"));
});
//error HAndler Middleware
app.use(errorMiddleware);
module.exports = app;

You can't serve your JSX files, you need to first build your front-end, so npm run build and then serve the content of your build folder ( in my case it's dist/ )
app.use(express.static(path.join(__dirname, "./front/dist/")));
app.get("*", (req, res) => {
res.sendFile(path.resolve(__dirname, "./front/dist/index.html"));
})

Node.js Error: Cannot GET/ from running on the web browser

So here I have 2 route files and 1 controllers for each.
My first router that is root, is working fine !
but my second route that is /teacher is giving me this error "Cannot GET /teacher"
I literally copy pasted the root route code and changed the variable names still its not working.
following are my files:
server.js
const express = require('express');
const dotenv = require('dotenv');
const root_rt = require('./routes/root-rt');
const teacher_rt = require('./routes/teacherlogin-rt')
dotenv.config();
const uri = process.env.DB_URI;
const port = process.env.PORT;
const app = express();
app.use(express.json());
app.get('/', root_rt);
app.get('/teacher', teacher_rt);
app.listen(port, () =>{
console.log(`server started on http://localhost:${port}`);
});
teacherlogin-rt.js
const express = require('express');
const router = express.Router();
const teacherController = require('../controllers/teacher-cnt');
router.route('/')
.get(teacherController.login);
module.exports = router;
teacher-cnt
module.exports.login = function (req, res) {
res.send('this is teacher login page');
};
Thank you in advance.

When using routers, you shouldn't use app.METHOD() to mount them, but app.use():
app.use('/', root_rt);
app.use('/teacher', teacher_rt);

Make the below change in your teacherlogin-rt.js, it will start working
teacherlogin-rt.js
const express = require('express');
const router = express.Router();
const teacherController = require('../controllers/teacher-cnt');
router.get('/', teacherController.login);
module.exports = router;
server.js
app.use('/', root_rt);
app.use('/teacher', teacher_rt);

Cannot GET error while trying to access URL using module.export (NodeJS)

I'm getting "Cannot GET /speakers" error on my browser when I am trying to access http://localhost:3000/speakers from the following code:
My Server.js File
const express = require('express')
const path = require('path')
const routes = require('./routes')
const app = express()
const port = 3000
app.set('view engine','ejs')
app.set('views', path.join(__dirname,'./views'))
app.use(express.static(path.join(__dirname,'./static')))
app.use('/', routes())
app.listen(port,()=>{
console.log(`Express server listening on port ${port}!`)
})
My Script.js File
This is my server.js file where I've declared various variables
const express = require('express')
const router = express.Router()
module.exports = () =>{
router.get('/',(request, response) =>{
return response.send('Speakers List')
})
router.get('/:shortname',(request, response) =>{
return response.send(`Detail page of {request.params.shortname}`)
})
return router;
}
My index.js file
const express = require('express')
const speakersRoute = require('./speakers')
const feedbackRoute = require('./feedback')
const router = express.Router()
module.exports = () =>{
router.get('/',(request, response) =>{
response.render('pages/index',{ pageTitle: 'Welcome'})
})
router.use('./speakers', speakersRoute())
router.use('./feedback', feedbackRoute())
return router
}
Can anyone help me on this?

Have you try change './speaker' to '/speaker' ?
// router.use('./speakers', speakersRoute())
router.use('/speakers', speakersRoute())

redirect to different controller dependant on Url

Ok so I'm trying to redirect the request to a different controller depending on the URL.
My server.js :
const express = require('express');
var app = express();
var router = express.Router();
// controllers
var { loginController } = require('./controller/loginController');
// Specify routes
app.use('/test', loginController);
app.listen(3000, () => {
console.log('started on port 3000');
});
module.exports = { app }
Now if the URL is /test then I would like to redirect the request to loginController, inside loginController I have the following:
const express = require('express');
var router = express.Router();
router.get('/', (req, res) => {
res.send('inside logincontroller');
});
Very short and sweet, however when I run node server.js I get the following error message: Router.use() requires middleware function but got a undefined now I've gone through the Router Use but I'm slightly confused (newbie) I don't have any middleware at present.
Would someone be able to explain to me how I go about redirecting the request to the loginController when the url is /test

server.js
const express = require('express')
// Controllers
var loginController = require('./controller/loginController')
var app = express()
// Specify routes
app.use('/test', loginController)
app.listen(3000, () => {
console.log('started on port 3000')
})
loginController.js
const express = require('express')
var router = express.Router()
router.get('/', (req, res) => {
res.send('inside logincontroller')
})
module.exports = router
Then if you visit http://localhost:3000/test will get the output 'inside logincontroller'