Make Axios send cookies in its requests automatically

It's also important to set the necessary headers in the express response. These are those which worked for me:

app.use(function(req, res, next) {
  res.header('Access-Control-Allow-Origin', yourExactHostname);
  res.header('Access-Control-Allow-Credentials', true);
  res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
  next();
});

TL;DR:

{ withCredentials: true } or axios.defaults.withCredentials = true

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From the axios documentation

withCredentials: false, // default

withCredentials indicates whether or not cross-site Access-Control requests should be made using credentials

If you pass { withCredentials: true } with your request it should work.

A better way would be setting withCredentials as true in axios.defaults

axios.defaults.withCredentials = true

You can use withCredentials property.

XMLHttpRequest from a different domain cannot set cookie values for their own domain unless withCredentials is set to true before making the request.

axios.get(BASE_URL + '/todos', { withCredentials: true });

Also its possible to force credentials to every Axios requests

axios.defaults.withCredentials = true

Or using credentials for some of the Axios requests as the following code

const instance = axios.create({
   withCredentials: true,
   baseURL: BASE_URL
})
instance.get('/todos')

I am not familiar with Axios, but as far as I know in javascript and ajax there is an option

withCredentials: true

This will automatically send the cookie to the client-side. As an example, this scenario is also generated with passportjs, which sets a cookie on the server