NEWSLETTER SIGNUP · AJAX (VANILLA JS)

Newsletter Signup for AJAX (vanilla JS)

Email-only newsletter capture — perfect for footers and landing pages. Free for 500 submissions per month — no backend, no SDK, no plugin.

Get free access key Copy the code

500/mo free·no card·drop-in for AJAX (vanilla JS)

form.htmlhtml12 lines

01<form action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">
03  <input type="hidden" name="subject" value="New newsletter subscriber">
04 
05  <label for="email">Your email *</label>
06  <input id="email" type="email" name="email" placeholder="you@example.com" required>
07 
08  <!-- honeypot — bots fill every field -->
09  <input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">
10 
11  <button type="submit">Send</button>
12</form>

500

submissions / mo, free

fields, ready to ship

code outputs

60s

from copy to inbox

§ 00AJAX (vanilla JS) + Newsletter Signupplatform-specific integration guide

Why AJAX (vanilla JS) developers choose splitforms for newsletter signup

The newsletter signup on this page integrates with AJAX (vanilla JS)'s development workflow using the form markup in your AJAX (vanilla JS) project. Whether you're deploying to a static host or a server-rendered platform, the form posts standard <code>FormData</code> to splitforms, so your backend complexity stays at zero. AJAX (vanilla JS)'s ecosystem has strong tooling for UI, but form delivery is a separate concern that splitforms handles independently — Free includes spam filtering and a submissions dashboard; Starter adds email notifications and webhooks.

§ 00Quick answerHTML · marketing

Yes — this is the shortest safe path for AJAX (vanilla JS).

Use the HTML snippet on this page, keep the newsletter signup fields visible in your AJAX (vanilla JS) UI, and let splitforms handle delivery, spam filtering, storage, and webhooks.

best implementation

Paste the HTML version, then replace YOUR_ACCESS_KEY.

The posted payload contains your email. Required fields are your email.

native ajax (vanilla js) reality

Vanilla JS / AJAX forms have been the no-framework default since jQuery's heyday.

use case fit

Email lists still convert 5-10x social. The newsletter signup form is the single most leveraged piece of your site — pop it up smartly, not annoyingly, and it pays compound interest.

§ 01Newsletter Signup × AJAX (vanilla JS)why this combination, in 80 words

Built for AJAX (vanilla JS) developers who hate operating a backend.

Splitforms is the form backend for AJAX (vanilla JS) sites. One POST endpoint, no SDK, no plugin — drop the newsletter signup into a page and ship.

Splitforms is the form backend for AJAX (vanilla JS) sites. One POST endpoint, spam filtering, and a real dashboard — drop-in, no server, no PHP. Free for 500 dashboard submissions per month; Starter adds email, signed webhooks, exports, and retained uploads; Pro is $5/mo for 5,000.

✦ what you get on the free plan

✓500 form submissions per month
✓2 forms on Free; unlimited forms on Pro
✓Spam protection (honeypot + classifier)
✓Webhooks: Slack, Discord, WhatsApp, custom
✓CSV export of all submissions
✓Email notifications (CC and BCC on Pro)

§ 02Copy-paste codeHTML · 12 lines

Drop into any AJAX (vanilla JS) project.

Replace YOUR_ACCESS_KEY with your splitforms key, paste into a AJAX (vanilla JS) page, and ship. No build-time integration required.

form.htmlhtml12 lines

01<form action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY">
03  <input type="hidden" name="subject" value="New newsletter subscriber">
04 
05  <label for="email">Your email *</label>
06  <input id="email" type="email" name="email" placeholder="you@example.com" required>
07 
08  <!-- honeypot — bots fill every field -->
09  <input type="checkbox" name="botcheck" style="display:none" tabindex="-1" autocomplete="off">
10 
11  <button type="submit">Send</button>
12</form>

§ 03Setup3 steps · 60 seconds · zero config

Generate, embed, receive.

Three actions stand between you and your first newsletter signup submission. None of them require a backend, a database, or a CAPTCHA library.

STEP 01GENERATE

Generate a free splitforms key

Create your form

key=sk_live_••••••••

STEP 02EMBED

Paste the newsletter signup into your AJAX (vanilla JS) project

Drop the form snippet into a AJAX (vanilla JS) page, component, or layout. Replace YOUR_ACCESS_KEY with the key from your dashboard. The form action is a hard-coded URL — no env vars or build-time wiring needed.

snippethtml

<form action="https://splitforms.com/api/submit" method="POST">
  …
</form>

STEP 03RECEIVE

Receive submissions

Dashboard updates live on Free. Starter adds email delivery, signed webhooks, CSV export, Slack/Discord forwarding, and BCC to your team.

inbox · 1 newjust now

FROM contact@yoursite.com

New newsletter subscriber

Maya Iyer maya@studio71.co

Loved the demo — quick question about pricing on the 3-year plan. Are usage limits per project or account-wide?

§ 03bNewsletter Signup Form (Email Capture)template-specific playbook

The reason this newsletter signup exists.

Webhooks into ConvertKit / Mailchimp / Substack / Beehiiv / Buttondown.

why it matters

Newsletter conversion benchmarks haven't moved much: ConvertKit / Substack landing pages convert at 1-2% of visitors, popup forms at 2-4%, content-upgrade lead magnets at 8-15%. The form itself is trivially simple (email field, optional name) but where it lives matters — exit-intent popup, scroll-triggered slide-in, footer inline, content-end inline all behave differently. Push the submission to your ESP (Mailchimp / ConvertKit / Substack / Beehiiv / Buttondown) via webhook so the welcome email fires automatically. GDPR / CASL require explicit consent — a checkbox or unbundled-consent text under the form covers it for EU and Canadian visitors.

route the submission

Pick the form placement

Popup (highest volume, also highest annoyance — set scroll or exit-intent triggers), inline footer (low volume, low friction), content-end inline (best conversion-quality combo).

Push to your ESP

Webhook the email to ConvertKit / Mailchimp / Substack / Beehiiv / Buttondown. Each has either a native webhook receiver or a Zapier connector. Welcome email fires automatically on add.

Add GDPR / CASL consent

EU visitors need explicit consent — add a 'I want to receive emails from [your brand]' checkbox or unbundled-consent text under the email field. Required text varies by jurisdiction; consult your privacy lawyer if in doubt.

§ 03cAJAX (vanilla JS) production notesnative path · deploy · gotchas

What changes when this newsletter signup lives in AJAX (vanilla JS).

These notes come from the AJAX (vanilla JS) platform registry and are rendered on this template page so crawlers see the framework-specific answer without opening a separate guide.

without splitforms

Vanilla JS / AJAX forms have been the no-framework default since jQuery's heyday. Without splitforms, the 'AJAX' part is one fetch line; the operational part is everything else: a backend route, an SMTP provider, a database for submissions, a honeypot or reCAPTCHA, a thank-you page, error handling for HTTP 4xx/5xx, retry logic. For 'JS-only on a static host' setups (Cloudflare Pages, GitHub Pages, S3), there's literally no server to run the route on — historically that meant Formspree, Formspark, Web3Forms, Basin. Splitforms is the modern entry: same shape, better free tier, better spam filtering, and signed webhooks from Starter.

deploy notes

Vanilla JS deploys to any static host — the snippet is HTML + inline <script>, no build step. CSP: if your site sets connect-src 'self', add https://splitforms.com to the directive or fetch is blocked. Browser support: native fetch is in every browser back to Edge 18 — the snippet runs without polyfills on every market-share-relevant browser. The progressive-enhancement variant (Pattern B) keeps the form working when JS fails to load — useful on flaky networks, ad-blocked clients, or for accessibility tools that disable JS.

AJAX (vanilla JS) gotcha

Forgetting e.preventDefault() reloads the page

Without preventDefault, the browser does its own form submission to wherever the form's action attribute points (or the current page) AND your fetch runs. You see a flash, the page reloads, and your handler's effects are lost.

AJAX (vanilla JS) gotcha

FormData includes ALL form fields — even disabled ones get dropped

new FormData(form) skips inputs without a name attribute, skips disabled inputs, skips unchecked checkboxes/radios. If a field doesn't show up in your splitforms inbox, check whether it's disabled at submit time.

AJAX (vanilla JS) gotcha

fetch() doesn't reject on HTTP 4xx/5xx — only network errors

If splitforms returns a 401 (bad key) or 429 (rate limit), fetch resolves successfully. You have to check res.ok or data.success yourself. Wrapping in try/catch only catches network failures, not HTTP errors.

AJAX (vanilla JS) gotcha

Double-click submit fires two requests

Without disabling the button on the first click, a quick double-click sends two POSTs. Both succeed; the user sees one success message; you see two submissions. Always set button.disabled = true at the start of the handler.

PATTERN A

Pattern A — fetch + FormData + status element

Single submit listener. new FormData(form) reads inputs, append the access key, POST. Update an aria-live status <p> with the result. ~25 lines, no library. Use the same wiring for the newsletter signup fields on this page.

pattern-a.htmlhtml16 lines

01<form id="cf">
02  <input name="email" type="email" required />
03  <textarea name="message" required></textarea>
04  <button type="submit">Send</button>
05  <p id="msg" aria-live="polite"></p>
06</form>
07<script>
08  document.getElementById("cf").addEventListener("submit", async (e) => {
09    e.preventDefault();
10    const fd = new FormData(e.currentTarget);
11    fd.append("access_key", "YOUR_ACCESS_KEY");
12    const r = await fetch("https://splitforms.com/api/submit", { method: "POST", body: fd });
13    const data = await r.json();
14    document.getElementById("msg").textContent = data.success ? "Thanks!" : (data.message || "Try again");
15  });
16</script>

PATTERN B

Pattern B — progressive enhancement (works without JS)

Form has a real action attribute and a redirect hidden field — works with JS disabled (browser POSTs natively, splitforms 302s). When JS is available, the listener intercepts for inline UX. Best of both worlds, no compromise. Use the same wiring for the newsletter signup fields on this page.

pattern-b.htmlhtml13 lines

01<form id="cf" action="https://splitforms.com/api/submit" method="POST">
02  <input type="hidden" name="access_key" value="YOUR_ACCESS_KEY" />
03  <input type="hidden" name="redirect"   value="/thanks.html" />
04  <input name="email" type="email" required />
05  <button type="submit">Send</button>
06</form>
07<script>
08  document.getElementById("cf").addEventListener("submit", async (e) => {
09    e.preventDefault();
10    const r = await fetch(e.target.action, { method: "POST", body: new FormData(e.target) });
11    if ((await r.json()).success) location.href = "/thanks.html";
12  });
13</script>

§ 04Field-by-field rundown1 fields · names you POST

What every field actually does.

Each field below ships in the newsletter signup template — rename, remove, or add your own. Splitforms accepts any name you POST.

emailREQUIRED

Your email

Reply-to address — splitforms wires this so hitting reply goes back to the sender.

placeholder · you@example.com

§ 05Newsletter Signup on other frameworks22 frameworks · same backend

One backend. Every framework.

The same newsletter signup template works on every framework splitforms supports. Pick yours.

§ 06Questions9 answered

Newsletter Signup on AJAX (vanilla JS) — FAQ.

Direct answers, no marketing fluff. Missing one? Email hello@splitforms.com.

01Does this newsletter signup work on AJAX (vanilla JS)?

Yes. The form is plain HTML with a single POST endpoint, so it runs on any AJAX (vanilla JS) site without server-side code, plugins, or SDKs. Drop the snippet into a AJAX (vanilla JS) page or component and submissions land in your splitforms dashboard.

02How much does the newsletter signup cost on AJAX (vanilla JS)?

Free for 500 submissions per month — no credit card, no trial. Pro is $5/mo for 5,000 submissions, and there's a one-time $59 3-year plan (15,000 submissions/mo for 36 months). The same pricing applies regardless of which framework hosts the form.

03Can I customize the fields?

Yes. The template ships with sensible defaults (your email…) — add, remove, or rename any of them. Splitforms accepts whatever fields you POST.

04How does spam protection work on the newsletter signup?

A hidden honeypot field catches dumb bots, and a tuned classifier scores the rest. You only see real submissions in your dashboard. No CAPTCHA, no friction for human users — and it works the same on AJAX (vanilla JS) as on any other framework.

05Can I send the newsletter signup submissions to Slack or Discord?

Yes. Webhooks are available on Starter and above, with auto-formatted payloads for Slack, Discord, and WhatsApp (via CallMeBot). Or send raw signed JSON to any URL — Zapier, n8n, your own server. Configure in the splitforms dashboard.

06Will it work on a static AJAX (vanilla JS) site?

Yes — the form posts directly to splitforms from the browser, so no server is involved. Works on Vercel, Netlify, GitHub Pages, Cloudflare Pages, S3, or any plain Apache host.

07Will my form trigger GDPR consent requirements?

If you have any EU or UK visitors, yes — GDPR requires explicit, freely-given consent for marketing emails. Add a separate consent checkbox (not pre-checked) below the email field. Same applies to CASL in Canada and PECR in the UK. US-only audiences fall under CAN-SPAM, which is less strict but still requires honest unsubscribe handling.

08How do I push to ConvertKit / Mailchimp / Substack / Beehiiv?

Webhook the submission as JSON. ConvertKit has a native webhook receiver per form; Mailchimp accepts via API or Zapier; Substack accepts via Beehiiv/Substack import API or Zapier; Beehiiv has direct webhook support. The newsletter platform fires the welcome sequence automatically on add.

09Does double opt-in hurt list growth?

Double opt-in drops list size by 20-30% but improves deliverability and engagement metrics — single-opt-in lists accumulate spam-trap addresses that tank inbox placement. Most serious senders run double opt-in for that reason. Substack and Beehiiv default to it.

§ 07Comparisonvs Web3Forms · vs Formspree

splitforms vs everything else.

Same drop-in API. More free submissions, Starter signed webhooks, MCP support no other backend has.

Feature	Web3Forms	Formspree	splitforms
Free monthly submissions	250	50	500
Custom fields beyond contact	Yes	Pro tier	Free
Webhooks (Slack / Discord)	Pro tier	Pro tier	Free, signed
AI / MCP submission inbox	No	No	Yes
Long-term plan (3-year flat)	—	—	$59 every 3 years

§ 08More templates for AJAX (vanilla JS)0 adjacent patterns

Ship a newsletter signup on AJAX (vanilla JS) in 60 seconds.

500 submissions per month, free forever. No credit card. Copy the snippet above and paste it into your AJAX (vanilla JS) project.

Get free access key →Read the docs

founders pricing locked in · early access open

Newsletter Signup for AJAX (vanilla JS)

Why AJAX (vanilla JS) developers choose splitforms for newsletter signup

Yes — this is the shortest safe path for AJAX (vanilla JS).

Paste the HTML version, then replace YOUR_ACCESS_KEY.

Built for AJAX (vanilla JS) developers who hate operating a backend.

Drop into any AJAX (vanilla JS) project.

Generate, embed, receive.

Generate a free splitforms key

Paste the newsletter signup into your AJAX (vanilla JS) project

Receive submissions

The reason this newsletter signup exists.

Pick the form placement

Push to your ESP

Add GDPR / CASL consent

What changes when this newsletter signup lives in AJAX (vanilla JS).

Forgetting e.preventDefault() reloads the page

FormData includes ALL form fields — even disabled ones get dropped

fetch() doesn't reject on HTTP 4xx/5xx — only network errors

Double-click submit fires two requests

Pattern A — fetch + FormData + status element

Pattern B — progressive enhancement (works without JS)

What every field actually does.

Your email

One backend. Every framework.

Newsletter Signup on AJAX (vanilla JS) — FAQ.

splitforms vs everything else.

Other ready-to-ship AJAX (vanilla JS) forms.

Ship a newsletter signup on AJAX (vanilla JS) in 60 seconds.