JavaScript comment form
Add a comment form to any page with plain JavaScript and no backend. The submit listener posts with fetch so the reader stays where they are, and comments land in your inbox for review. Copy the code and add your access key.
How to build it
- Create a form in your Formpaste dashboard and copy its access key.
- Copy the form and script above into your page or post template.
- Replace YOUR_ACCESS_KEY_HERE with your access key, then publish.
Prompt for your AI coding agent
Add a Formpaste comment form to my page with vanilla JavaScript. Use a real form with a name field and a comment textarea, plus a submit listener that calls preventDefault and POSTs new URLSearchParams(new FormData(form)) to https://api.formpaste.com/submit with a hidden access_key, then shows a thank-you message without reloading the page. No backend.Or connect the Formpaste MCP server to Claude Code, Codex, Cursor, Claude Desktop, VS Code, or any mcp-remote client. See the setup guide.
JavaScript gotchas
A vanilla JavaScript contact form is plain HTML plus a submit listener. Point the form at Formpaste, add a script that calls preventDefault and posts the FormData with fetch, and the visitor stays on the page. No framework, no build step, no backend.
It is a form plus a listener
Keep the real form markup with an action pointing at the Formpaste endpoint, then add a submit listener that calls preventDefault and posts with fetch. There is no framework and nothing to install, so the same snippet works in a static site, a CMS template, or a hand-written page.
Progressive enhancement is free
Because the markup is a real form with an action, it still submits if your script fails to load or JavaScript is switched off. The listener is an upgrade that keeps the visitor on the page, not a requirement.
Post FormData, not a hand-built object
Build the body with new FormData(form) so every field comes along by name, including the hidden access_key. Wrap it in URLSearchParams for a normal text form, or post the FormData directly when the form has a file input.
Handle the response yourself
The endpoint returns JSON (success, message, id). Await the fetch and show your own success or error message, then call form.reset(). Or set a redirect URL in the dashboard and let the plain form post do the work with no script at all.
What to get right
Static sites have no comment backend, so a form fills the gap
A statically generated page cannot store comments on its own. Posting to Formpaste gives you a place for them to land without adding a database or a CMS.
Moderate before you publish
Comments are a spam magnet. Formpaste filters obvious spam and quarantines borderline submissions in a folder you review, so you approve what actually appears on the page.
Keep the email private
Collect the commenter's email for moderation and reply, but label it as not published so people know it will not appear on the site.
How it works
Three simple steps for form submissions to land in your email inbox.
Create your form, set your form's action URL to Formpaste's endpoint, and add your access key.
Create your form
Sign up, verify your email, and create an access key in your dashboard.
Copy the code
Paste the snippet above into your project. Pick CSS or Tailwind to match your site.
<form id="form" action="https://api.formpaste.com/submit" method="POST" class="mx-auto flex w-full max-w-md flex-col gap-4 rounded-xl border border-gray-200 bg-white p-6 shadow-sm dark:border-gray-800 dark:bg-gray-950">
<input type="hidden" name="access_key" value="YOUR_ACCESS_KEY_HERE">
<label class="flex flex-col gap-1.5 text-sm font-medium text-gray-900 dark:text-gray-100">Name
<input type="text" name="name" required class="rounded-md border border-gray-300 bg-white px-3 py-2 text-sm text-gray-900 shadow-sm outline-none focus-visible:ring-2 focus-visible:ring-gray-900 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:focus-visible:ring-gray-100" />
</label>
<label class="flex flex-col gap-1.5 text-sm font-medium text-gray-900 dark:text-gray-100">Email (not published)
<input type="email" name="email" placeholder="you@example.com" required class="rounded-md border border-gray-300 bg-white px-3 py-2 text-sm text-gray-900 shadow-sm outline-none focus-visible:ring-2 focus-visible:ring-gray-900 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:focus-visible:ring-gray-100" />
</label>
<label class="flex flex-col gap-1.5 text-sm font-medium text-gray-900 dark:text-gray-100">Comment
<textarea name="comment" required class="min-h-28 rounded-md border border-gray-300 bg-white px-3 py-2 text-sm text-gray-900 shadow-sm outline-none focus-visible:ring-2 focus-visible:ring-gray-900 dark:border-gray-700 dark:bg-gray-900 dark:text-gray-100 dark:focus-visible:ring-gray-100"></textarea>
</label>
<button type="submit" class="w-full rounded-md bg-gray-900 px-4 py-2 text-sm font-medium text-white shadow-sm transition-colors hover:bg-gray-800 disabled:opacity-60 dark:bg-white dark:text-gray-900 dark:hover:bg-gray-200">Post comment</button>
</form>
<script>
const form = document.getElementById("form");
form.addEventListener("submit", async (e) => {
e.preventDefault();
await fetch("https://api.formpaste.com/submit", { method: "POST", body: new URLSearchParams(new FormData(form)) });
form.reset();
});
</script>Add your access key
Replace the placeholder with your access key to start receiving submissions.
<input type="hidden" name="access_key" value="YOUR_ACCESS_KEY_HERE">JavaScript comment form FAQ
Paste a form. Get submissions.
Instantly without setting up any backend, servers or databases. 250 submissions/mo free - no credit card.