req.session with different domains node.js - node.js

Question

I'm building an app using next.js and node.js (express).
The client run on localhost:4000, and the server run on lovalhost:3000.
to communicate between the two domains Iwm using cors().
to authorization i'm using with cookieSession and jwt.
app.use(
cookieSession({
signed: false,
secure: false,
sameSite: false,
})
);
when user login i put on the session a jwt.
req.session = {
jwt:userJwt
};
this time the user needs to be identified by the cookie.
this works nice in postman environment, when a user sign in he is identified, the cookie with his jwt is saved.
but when i try to make the same request via the client unforteantually the cookie is not saved.
the client code:
const signin= () => {
const [email, setEmail] = useState('');
const [password, setPassword] = useState('');
const {doRequest, errors} = useRequest({
url: 'http://localhost:4000/api/auth/signin',
method: 'post',
body: {
email,password
},
onSuccess: () => Router.push('/')
});
the useRequest hook:
import axios from 'axios';
import { useState } from 'react';
const useRequest= ({url, method, body, onSuccess}) => {
const [errors, setErrors] = useState(null);
const doRequest =async () => {
try {
setErrors(null);
console.log(url);
const response = await axios[method](url,body);
console.log(response);
if(onSuccess) {
onSuccess(response.data);
}
return response.data;
} catch (error) {
console.log(error);
setErrors(
<div className= "alert alert-danger" >
<h4>Ooops...</h4>
{error.response.data ?
<ul className="my-0">
{error.response.data.errors.map(err => (
<li key = {err.message}> {err.message}</li>
))}
</ul>:{}
}
</div>
);
}
};
return { doRequest,errors }
};
export default useRequest;
Maybe because the diffrent domains the session is not the same?
How can I slove it?
My app
I hope I was clearly.
thank you!
I'm using process.env variables