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Every time someone submits my signup form, the whole page reloads and any message I wanted to show them disappears instantly.
What you'll have at the end
A form that posts its data with fetch and shows a success message without a full page reload
You need
A working HTML form with named email and password inputs and a submit button, whose action attribute already points at a real signup endpoint the ordinary way, with a full page load on submit.
Not covered
Checking whether an email looks valid or a password is long enough before the request goes out, and turning a dropped connection or an unlisted status into its own message: both stay outside this one.
Turn a failed fetch request into a message the user understands
when the request also needs to survive a dropped connection or turn every status code into its own message, that pattern goes deep on exactly that
Add real-time validation to a signup form with no JavaScript
catching an empty or malformed field before the request ever goes out, without writing any script for it, is covered there instead
Checked 21 Aug 2026
Part of the JavaScript cookbook