Email api using react node nodemailer express is not working

I am trying to create an contact page using ReactJs NodeJs express and nodemail. I am not getting any error. But it's not working. The post request is not working so i guess there's something wrong with the axios function but it could be anywhere else too so.Is the error in the backend part or the frontend part How do i fix it?

Post Log saying

Proxy error: Could not proxy request /api/forma from localhost:3000 to localhost:3001 (ECONNRESET)

Client side

import React,{useState} from 'react'
import axios from 'axios';


const Form = () => {
    const [name,setName] = useState("");
    const [email,setEmail] = useState("");
    const [message,setMessage] = useState("");
    const [sent,setSent] = useState(false);

    const formSubmit=(e)=> {
        e.preventDefault();

        let data = {
            name:name,
            email:email,
            message:message
        }

        axios.post('/api/forma',data)
        .then(res => {
            setSent(true);
        },resetForm())
        .catch(() => {
            console.log("message not sent");
        })

    }

    const resetForm = () => {
        setName("");
        setEmail("");
        setMessage("");
    
        setTimeout(()=> {
            setSent(false);
        },3000)  
    }

    

    return (
        <div className="container">
            <form onSubmit={formSubmit}>
                <div className="single">
                    <label>Name</label>
                    <input type="text" name="name" className="name" placeholder="Enter your name" 
                    value={name}
                    onChange={e => setName(e.target.value)}
                    />
                </div>
                <div className="single">
                    <label>Email</label>
                    <input type="text" name="email" className="email" placeholder="Enter your email"
                    value={email}
                    onChange={e => setEmail(e.target.value)}/>
                </div>

                <div className="textarea">
                    <label>Message</label>
                    <textarea name="message" id="" cols ="30" rows="5" placeholder="Enter your message here"
                    value={message}
                    onChange={e => setMessage(e.target.value)}></textarea>
                </div>

                <div className={sent?'msg msgAppear':'msg'}>
                    Message has been sent
                </div>

                <div>
                    <button type="submit">submit</button>
                </div>
            </form>
        </div>
    )
}

export default Form

Server side

const express = require('express');
const bodyParser = require('body-parser');
const nodemailer = require('nodemailer')
const cors = require('cors')

const app = express();

app.use(bodyParser.json);
app.use(bodyParser.urlencoded({extended:true}));
app.use(cors());

app.get('/',()=>{
    resizeBy.send("Welcome")
});

app.post('/api/forma',(req,res) => {
    let data = req.body
    let smtptransport = nodemailer.createTransport({
        service:'Gmail',
        port:465,
        auth:{
            user:'[email protected]',
            pass: "secreate"
        }
    });

    let  mailOptions = {
        from:data.email,
        to:'[email protected]',
        subject:`Message from ${data.name}`,
        html:`
        <h3>Informations<h3>
        <ul>
        <li>Name: ${data.name}</li>
        <li>Name: ${data.email}</li>
        </ul>

        <h3>Message<h3>
        <p>${data.message}</p>
        `

    }


    smtptransport.sendMail(mailOptions,(error,response) => {
        if(error){
            res.send(error)
        }
        else{
            res.send('Success')
        }
    })

    smtptransport.close();
})

    const PORT = process.env.PORT || 3001;

    app.listen(PORT,() => {
        console.log(`Server starting at port ${PORT}`);
    })