message : "Request failed with status code 404" name : "AxiosError" - node.js

Question

I've been struggling to make the usersRoute work. I keep getting the error message: "Request failed with status code 404" name: "AxiosError", get request is working but post not - Cannot POST /api/users/register. Could you help me figure this out, please? Thank you
usersRoute code is this:
const express = require("express");
const router = express.Router();
const User = require("../models/userModel");
router.post("/login", async(req, res) => {
const {username , password} = req.body
try {
const user = await User.findOne({username , password})
if(user){
res.send(user)
}
else{
return res.status(400).json(error);
}
} catch (error) {
return res.status(400).json(error);
}
});
router.post("/register", async(req, res) => {
try {
const newuser = new User(req.body)
await newuser.save()
res.send('Korisnik uspešno registrovan')
} catch (error) {
return res.status(400).json(error);
}
});
module.exports = router
userAction:
import axios from 'axios'
import {message} from 'antd'
export const userLogin=(reqObj)=>async dispatch=>{
dispatch({type: 'LOADING', payload:true})
try {
const response = await axios.post('/api/users/login', reqObj)
localStorage.setItem('user', JSON.stringify(response.data) )
message.success('Prijava uspela')
dispatch({type: 'LOADING', payload:false})
setTimeout(() => {
window.location.href='/'
}, 500);
} catch(error) {
console.log(error)
message.error('Pokušajte ponovo')
dispatch({type: 'LOADING', payload:false})
}
}
export const userRegister=(reqObj)=> async dispatch =>{
dispatch({type: 'LOADING', payload:true})
try {
const response = await axios.post('/api/users/register' , reqObj)
message.success('Registracija uspela')
setTimeout(() => {
window.location.href='/login'
}, 500);
window.location.href='/login'
dispatch({type: 'LOADING', payload:false})
} catch(error) {
console.log(error)
message.error('Pokušajte ponovo')
dispatch({type: 'LOADING', payload:false})
}
}
server.js:
const express = require('express')
const app = express()
const port = process.env.PORT || 5000
const dbConnection = require('./db')
app.use(express.json())
app.use('/api/cars/', require('./routes/carsRoutes'))
app.use('/api/users/', require('./routes/usersRoute'))
app.get('/', (req,res) => res.send('Hello World'))
app.listen(port, () => console.log(`Node JS Server Started in Post ${port}`))
userModel:
const mongoose = require("mongoose");
const userSchema = new mongoose.Schema({
username : {type:String , required : true},
password : {type:String , required : true}
})
const userModel = mongoose.model('users' , userSchema)
module.exports = userModel
package.json:
"proxy": "http://localhost:5000/"