Cookie in Set-Cookie header not being set - node.js

Question

I'm sending a request to a node.js server from a reactjs client using axios as shown below.
import axios from 'axios';
const apiClient = axios.create({
withCredentials: true,
baseURL: 'http://localhost:8080'
});
async function(payload) {
try {
debugger;
let result = await apiClient.post('/auth/signup/', payload);
debugger;
return result;
} catch (error) {
debugger;
throw error;
}
}
The node.js endpoint sets a cookie in the response as shown below.
const express = require('express');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser')
const cors = require('cors');
const jwt = require('jsonwebtoken');
router.use(bodyParser.json());
router.use(bodyParser.urlencoded({ extended: true }));
router.use(cors({ origin: 'http://localhost:3000', credentials: true, exposedHeaders: ['Set-Cookie', 'Date', 'ETag']} ));
router.use(cookieParser());
router.post('/signup', async (req, res, next) => {
debugger;
let database = req.app.locals.database;
try {
let user = await database.findByUsername(req.body.username);
let token = await jwt.sign({username: user.username}, config.secret, {expiresIn: "15m"});
res.cookie('jwt', token, {
maxAge: 900,
});
} catch (error) {
debugger;
return res.status(503).send({ auth: false, message: 'Database error.' });
}
});
The Set-Cookie header of the response contains the cookie as expected.
However, Chrome does not appear to be setting the cookie, as I cannot see the cookie in the Application window of the Developer Console.
I've looked at the answers to the following questions, which mention setting { withCredentials: true } in the axios configuration and not using a wildcard origin for cors in node.js, but I am already doing both.
Set-Cookie header not setting cookie in Chrome
Set cookies for cross origin requests
Any ideas as to why the cookie is not being set and how to fix this issue?

Answer 1

Though you are hosting client and server in the same domain as http://localhost, your ports are different, so the same-origin policy is failed here. You can check https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy.
As so, you making a CORS request, check your network tab in your developer tools in your current browser, you might see a preflight request OPTIONS, before your client sends POST request to your server.
The server must specify headers to accept the origin of your next request - POST request from http://localhost:8000 with method POST, you can refer to https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request
HTTP/1.1 204 No Content
Connection: keep-alive
Access-Control-Allow-Origin: http://localhost:3000
Access-Control-Allow-Methods: POST // Your next request will use POST method
Access-Control-Max-Age: 86400
Access-Control-Allow-Credentials: true // cookies accepted
Added:
In Set-Cookie, Max-Age must be non-zero digit. It be rounded up into integer according to RFC doc. For express.js, cookies `maxAge property is on the scale of miliseconds
The solution will be set the maxAge property as second * 1000
res.cookie('jwt', token, {
maxAge: 10000,
});

Answer 2

Here's a repost of my answer on a similar question https://stackoverflow.com/a/62821342/8479303
In my case, the network panel showed that the response had the 'Set-Cookie' header, but in axios the header wouldn't show up, and the cookie was being set.
For me, the resolution was setting the Access-Control-Expose-Headers header.
For explanation, from this comment on an issue in the axios repository I was directed to this person's notes which led me to set the Access-Control-Expose-Headers header -- and now the cookie is properly setting in the client.
So, in Express.js, I had to add the exposedHeaders option to my cors middleware:
const corsOptions = {
//To allow requests from client
origin: [
"http://localhost:3001",
"http://127.0.0.1",
"http://104.142.122.231",
],
credentials: true,
exposedHeaders: ["set-cookie"],
};
...
app.use("/", cors(corsOptions), router);
It was also important that on the axios side I use the withCredentials config in following axios requests that I wanted to include the cookies.
ex/
const { data } = await api.get("/workouts", { withCredentials: true });