Eleventy

Inline

Eleventy templates are plain HTML, so a form can point straight at your action URL.

---
layout: base.njk
title: Contact
---

<form action="https://submit-form.com/your-form-id" method="POST">
  <label>
    <span>Message</span>
    <textarea name="message"></textarea>
  </label>
  <button type="submit">Send</button>
</form>

Reusable include

Keeping the form id in a global data file means one edit when it changes, and no id duplicated across templates.

Add src/_data/formspark.json:

{
  "formId": "your-form-id"
}

Add src/_includes/contact-form.njk:

<form action="https://submit-form.com/{{ formspark.formId }}" method="POST">
  <label>
    <span>Message</span>
    <textarea name="message"></textarea>
  </label>
  <button type="submit">Send</button>
</form>

Then include it from any template:

{% include "contact-form.njk" %}