Does someone know why Sitecore expose your API_KEY with jss forms. Create a simple form, open chrome dev tools (network tab) and click submit.
You will see something like this:
http://localhost:3000/api/jss/formbuilder?fxb.FormItemId=207146f1-9c73-408c-94f0-c6b3d9ae18fa&fxb.HtmlPrefix=fxb.36b3f201-5cee-4e7c-a812-6432e7ee4a88&sc_apikey={your_producion_key}&sc_itemid=65675a00-6f7a-4dc5-971e-943ca1aab455&sc_lang=en
where {your_producion_key}
is the value store in your environments variables .env
SITECORE_API_KEY=
.