Pass cookies through two Next.js projects API endpoints

I am using two Next.js projects,

  • The first one is a Login platform on localhost:3000 where user can create their account an access information.
  • The second one on localhost:3001 is the Website

The Website is using a custom Next route /pages/api/login that fetch the login endpoint of the Login platform which is also a custom Next API Route /pages/api/get-connected-user.

When a user is connected from the Login Platform, a Server Cookie is set. If this cookie is available, the api check if the user is connected an will return "true". When I directly call the /pages/api/login I can get the true value but once I am calling it from the Website API (which call the same endpoint) it always return false since the cookies are not available inside req.headers since cookie are not passed


import axios from 'axios'
import { NextApiResponse } from 'next'

export default async (req: any, res: NextApiResponse) => {
  const domain = 'http://localhost:3001/'

  try {
    const url = `http://localhost:3000/api/get-connected-user`

    const { data } = await axios.get(url, { withCredentials: true })


import { NextApiResponse } from "next";
import { getUserFromServer } from "api/user";

export default async (req: any, res: NextApiResponse) => {
  const { ref } = req.query;

  try {
    const isConnected = (req.headers?.cookie?.toString() || "").includes(


    const serverCookie = req.headers?.cookieuser;
    let user;
    if (!isConnected && serverCookie)
      user = await getUserFromServer(serverCookie);
    const response = isConnected || !!user?.id;

    res.send(JSON.stringify({ isConnected: response }));
  } catch (err) {

My conclusion is by hitting /pages/api/login is it does not send the cookie from my req through the distant endpoint which I know is for security reason but I am asking myself if it exist a way to do it ?

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