Custom mailchimp signup form in React

Question

I have a react app that I would like to add mailchimp signup form to. I am building a custom signup form and have user sign up by entering their first and last name and email. I

Answer 1

Like @marco-gaspari, I also ran into a lot of issues with this. My answer is a variation of theirs, but with some tweaks that, for me, were necessary to make it work.

In addition to switching postat the end of the action url to post-json and including the c attribute equal to ? (in addition to the u and id attributes from the original url; all of which I chose to incorporate as hidden input fields), I also had to redirect the output to a hidden