Connect Netlify React aplication with MongoDB Atlas using Axios

Question

I'm build an simple website and i have a form that capture {name, email, phone and menssage}. I'm using Mongo Atlas to store my datas. I did deployed my React Frontend using Netlify and i need to GET and POST datas using Axios. The aplication works localy with baseURL='http://localhost:3333', but i need thats works with my deploy frontend. How i can change this URL to my Netlify deploy GET and POST on mongo atlas?

• BACKEND FILES

index.js

const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const routes = require('./routes');
const cors = require('cors');

const app = express();

mongoose.connect(`mongodb+srv://MYUSER:[email protected]/myFirstDatabase?retryWrites=true&w=majority`, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
});

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

 const PORT = process.env.PORT || 3333;

app.listen(PORT, () => {
    console.log(`BACKEND EXECUTANDO NA PORTA: ${PORT}`)
});

LeadController.js

module.exports = {

    //Listar Leads

    async index(req, res) {
        const leads = await Lead.find();

        return res.json(leads);
    },

    //Cadastrar Lead

    async store(req, res) {
        const { name, email, phone, msg } = req.body;

        let lead = await Lead.insertMany({
            name: name,
            email: email,
            phone: phone,
            msg: msg,
            date: new Date(),
        });

        return res.json(lead);
    },
};

routes.js

const LeadController = require('./controller/LeadController');

const routes = Router();

routes.get('/leads', LeadController.index);
routes.post('/insert', LeadController.store);

module.exports = routes;

• FRONTEND FILES

api.js

import axios from 'axios';

const api = axios.create({
    baseURL:'https://localhost:3333'
});

export default api;

function request

 async function handleNewLead(e) {
        e.preventDefault();
    
        await api.post('/insert', {
          name: name,
          email: email,
          phone: phone,
          msg: msg,
        })
        setName('');
        setEmail('');
        setPhone('');
        setMsg(''); 
      }