I’m following a MERN stack course and I’ve got stuck in middle of a problem. There is no point in completing it before solving this problem, and in my searches I did a thorough inspection and couldn’t find the source of the problem. I just added the user sign up and was checking it with Insomnia, according to the following picture:

enter image description here
.
enter image description here
When I used POST is nothing happened
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index.js

import express from 'express';
import mongoose from 'mongoose';
import dotenv from 'dotenv';
import userRouter from './routes/user.routes.js';
import authRouter from './routes/auth.route.js';

dotenv.config();

mongoose
  .connect(process.env.MONGO)
  .then(() => {
    console.log('Connected to MongoDB!');
  })
  .catch((err) => {
    console.log(err);
  });

const app = express();

app.use(express.json());

app.listen(3000, () => {
    console.log('Server is running on port 3000');
    }
); 


app.use('/api/user', userRouter);
app.use('/api/auth', authRouter);

user.controllers.js

export const test = (req, res) => {
    res.json({
        message: 'Api route is Working!',
    });
};

auth.controller.js

export const signup = (req, res) => {


    console.log(req.body);
};

user.routes.js

import express from 'express';
import {test} from '../controllers/user.controllers.js';

const router = express.Router();

router.get('/test', test);

export default router;

auth.route.js

import express from 'express';
import { signup } from '../controllers/auth.controller.js';

const router = express.Router();

router.post('/signup', signup);

export default router;

user.model.js

import mongoose from "mongoose";

const userSchema = new mongoose.Schema({
    username: {
        type: String,
        require: true,
        unique: true,   
    },
    email: {
        type: String,
        require: true,
        unique: true,   
    },
    password: {
        type: String,
        require: true,   
    }
}, { timestamps: true});

const User = mongoose.model('User', userSchema);

export default User;

index.js

import express from 'express';
import mongoose from 'mongoose';
import dotenv from 'dotenv';
import userRouter from './routes/user.routes.js';
import authRouter from './routes/auth.route.js';

dotenv.config();

mongoose
  .connect(process.env.MONGO)
  .then(() => {
    console.log('Connected to MongoDB!');
  })
  .catch((err) => {
    console.log(err);
  });

const app = express();

app.use(express.json());

app.listen(3000, () => {
    console.log('Server is running on port 3000');
    }
); 


app.use('/api/user', userRouter);
app.use('/api/auth', authRouter);

.env

MONGO = "mongodb+srv://supichaya:[email protected]/real-docfill?retryWrites=true&w=majority&appName=Cluster0"

package.json

{
  "name": "docfill-project",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "dev": "nodemon api/index.js",
    "start": "node pai/index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "dotenv": "^16.4.5",
    "express": "^4.19.2",
    "mongoose": "^8.3.3",
    "nodemon": "^3.1.0"
  }
}

I tried searching for the problem but couldn’t find it so I couldn’t proceed to the next part.