How to set cookies express, react.js

Question

I am building a login system using express for node.js and react.js. In my back-end when a user logs in, it creates a cookie. When I go to Network > Login I can see this:

Answer 1

Try to set on you index.js or app.js server side this:

  app.use(function(req, res, next) {
  res.header('Content-Type', 'application/json;charset=UTF-8')
  res.header('Access-Control-Allow-Credentials', true)
  res.header(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept'
  )
  next()
})

and in you client site add options like this:

let axiosConfig = {
  withCredentials: true,
}

export async function loginUser(data) {
  try {
    const res = await axios.post(
      `${URL}:${PORT}/${API}/signin`,
      data,
      axiosConfig
    )
    return res
  } catch (error) {
    console.log(error)
  }
}

Answer 2

Do not forget to adjust cors middleware.

Your node.js express code

const express = require("express");
const cors = require('cors')

const app = express();

app.use(cors(
  {
    origin: 'http://localhost:3000',
    optionsSuccessStatus: 200 // some legacy browsers (IE11, various SmartTVs) choke on 204
  }
));

app.use(function(req, res, next) {
  res.header('Content-Type', 'application/json;charset=UTF-8')
  res.header('Access-Control-Allow-Credentials', true)
  res.header(
    'Access-Control-Allow-Headers',
    'Origin, X-Requested-With, Content-Type, Accept'
  )
  next()
})

app.get("/auth", function(req, res){

  res.cookie('token', 'someauthtoken')
  res.json({id: 2});
});

app.listen(3030);

Your front-end code

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


async function loginUser() {
  try {
    const res = await axios.get(
      'http://localhost:3030/auth',
      {
        withCredentials: true,
      }
    )
    return res
  } catch (error) {
    console.log(error)
  }
}

function App() {

  useEffect(() => {
    loginUser();
  }, [])

  return (
    <div>

    </div>
  );
}

export default App;