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SvelteKit form actions need a server — which adapter-static sites don’t have. Pointing your form at a Crunchforms endpoint keeps the whole site static while the form still works.

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Before you start: create your endpoint

Every guide on this page needs a Crunchforms form ID. Getting one takes about two minutes:
  1. Sign up free — 1,000 submissions a month included, no credit card required.
  2. In your dashboard, click New Form, give it a name, and pick a response type: Redirect for classic form posts (the visitor lands on your thank-you page), or JSON if you’ll submit with JavaScript and handle the response yourself.
  3. Your endpoint is https://crunchforms.com/form/{formID} — copy it with the Copy Action URL button, or use the dashboard’s snippet generator.
The quickstart covers this in more detail.

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Option 1: plain form post

Set the form’s response type to Redirect and let the browser do the work:
+page.svelte
<form action="https://crunchforms.com/form/{formID}" method="post">
  <label for="email">Email</label>
  <input name="email" type="email" id="email" required />

  <label for="message">Message</label>
  <textarea name="message" id="message" rows="5" required></textarea>

  <button type="submit">Send</button>
</form>

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Option 2: fetch with a JSON response

Set the response type to JSON for inline feedback:
+page.svelte
<script>
  let status = $state('idle'); // idle | sending | sent | error

  async function handleSubmit(e) {
    e.preventDefault();
    status = 'sending';
    const data = Object.fromEntries(new FormData(e.target));
    try {
      const res = await fetch('https://crunchforms.com/form/{formID}', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data),
      });
      const result = await res.json();
      status = result.success ? 'sent' : 'error';
    } catch {
      status = 'error';
    }
  }
</script>

{#if status === 'sent'}
  <p>Thanks — we'll be in touch!</p>
{:else}
  <form onsubmit={handleSubmit}>
    <label for="email">Email</label>
    <input name="email" type="email" id="email" required />

    <label for="message">Message</label>
    <textarea name="message" id="message" rows="5" required></textarea>

    <button type="submit" disabled={status === 'sending'}>
      {status === 'sending' ? 'Sending…' : 'Send'}
    </button>
    {#if status === 'error'}<p role="alert">Something went wrong — please try again.</p>{/if}
  </form>
{/if}
(Using Svelte 4? Replace $state('idle') with a plain let status = 'idle' and onsubmit with on:submit|preventDefault.)

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Stop the spam before it starts

Every public form gets found by bots eventually. Crunchforms filters submissions server-side on every plan, including Free:

Honeypot

A hidden field humans never see — if it’s filled, the submission is rejected. Zero friction for real visitors.

Cloudflare Turnstile

Invisible bot detection. Add the widget to your form and Crunchforms validates the token server-side.

reCAPTCHA v3

Score-based validation with a threshold you control per form.
The honeypot alone stops most drive-by spam and takes one extra line of markup — enable it in your form’s settings, then include the hidden field in your form.

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Troubleshooting

  • Check the form is set to Active in your dashboard.
  • If you’ve enabled Turnstile or reCAPTCHA on the form, submissions without a valid token are rejected — including your own tests.
  • Check you haven’t exceeded your plan’s monthly submission quota.
Set the form’s response type to Redirect and provide a success URL (and a failure URL) in the form settings. If you’re submitting with JavaScript, use the JSON response type instead and navigate in your code.
The endpoint accepts cross-origin requests, JSON bodies (Content-Type: application/json), and classic URL-encoded form bodies. Set the form’s response type to JSON so your code gets { "success": true } back instead of a redirect.
Use the Send Test Submission action next to your form in the dashboard — it posts a sample submission to your live endpoint so you can see the pipeline working end to end.

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Next steps

Form configuration

Response types, notification emails, daily summaries, and more

Free HTML form templates

Contact, feedback, RSVP, job application, and quote-request forms ready to paste

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Need help?

Get Support

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