Form plumbing, in plain words.
Every term behind a working form — the endpoint, the action attribute, the honeypot, the webhook — defined in one sentence you can quote, then unpacked the way you'd explain it to a colleague.
Definitions first, product second.
Each entry answers its question in the first sentence and teaches the concept on its own terms — what a honeypot actually catches, why Reply-To exists, what a webhook signature proves. FormWire appears afterwards as the worked example, so you leave knowing the idea even if you never use the product. More terms join the list as their pages ship.
What it is and how it works.
The URL your form POSTs to.
The hidden field that catches bots.
The attribute that aims your form.
Invisible inputs and what they're for.
Why bots submit forms, and how.
Reply straight to the submitter.
A POST to your endpoint on each submission.
Challenge tests, from reCAPTCHA to Turnstile.
Cloudflare's invisible challenge.
How file uploads are sent.
Encodings a form can submit with.
Why fetch submissions just work.
Proving a webhook is really from us.
The math behind signed payloads.
The OPTIONS call before your POST.
Throttling abusive senders.
The HTTP verb doing the work.
Checking input, client and server side.
The auto-reply your submitter gets.
The protocol that sends the email.
Why your emails reach the inbox.
Cross-site request forgery, and forms.
The header that declares the body format.
Form data carried in the URL.
What 200 and 4xx mean for a form.
Send visitors to a thank-you page.
Accepting files through an HTML form.
Put the concepts into practice.
Free tier forever. No credit card required.