LanesLanes
Docs/Forms/Guides/Integrating a form

Integrating a form

Wire an endpoint into a static HTML form, a fetch call, or a server, and choose where submissions go.

Integrating means pointing something at the endpoint and deciding where submissions go. Pick the surface that matches your stack.

Plain HTML form

The simplest integration: set the form action to your endpoint_url and let the browser POST. Because the browser sends Accept: text/html, the visitor is redirected to /thanks/{form_id} on success. No JavaScript required.

index.html
<form action="https://api.lanes.sh/v1/f/YOUR_FORM_ID" method="POST">
  <input type="email" name="email" required />
  <textarea name="message"></textarea>
  <!-- honeypot: bots fill this, humans never see it -->
  <input type="text" name="_gotcha" style="display:none" tabindex="-1" />
  <button type="submit">Send</button>
</form>

Keep the hidden _gotcha input in your markup. It is the honeypot that silently absorbs bots.

fetch / AJAX

For a custom UI, POST JSON and handle the receipt yourself:

js
const res = await fetch("https://api.lanes.sh/v1/f/YOUR_FORM_ID", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({ email, message, _gotcha: "" }),
});
const { ok, submission_id } = await res.json();

Never put an API key in browser code

Browser submissions are authorized by the form's allowed_origins, not by a secret. A workspace key shipped to the browser is a leaked key. Keep public, browser-facing forms in open mode with an origin allowlist. See Securing your endpoints.

Post from a backend

From a backend, POST JSON the same way you would with curl. If the form is in api_key mode, add the workspace key as a bearer token:

bash
curl -X POST https://api.lanes.sh/v1/f/YOUR_FORM_ID \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer lfk_YOUR_KEY" \
  -d '{"email": "[email protected]", "message": "Hello!"}'

Where submissions go

Delivery is configured per form as a list of workflow actions. Two are live today:

ActionStatusWhat it does
emailLiveForwards each non-spam submission to your verified recipients (up to 5).
store (lanes)LiveKeeps submissions in Lanes-hosted storage, viewable and exportable from the dashboard.
store (custom)Coming soonYour own database, such as Supabase. Returns 422 action_not_available today.
webhookComing soonPOST each submission to your URL. Returns 422 action_not_available today.

Email forwarding

Adding a recipient sends a confirmation link (GET /v1/verify-email/{token}). Until a recipient confirms, it is silently skipped, so unverified addresses never receive mail. When a form is claimed with recipients, the first one is verified for you and forwarding starts.

Forwarding waits for a claim

An unclaimed form stores submissions but forwards nothing. Delivery activates the moment the form is claimed.

Where a browser lands after posting

Browser posts land on a hosted /thanks/{form_id} page. A per-form redirect override (sending visitors to your own thank-you URL) is on the roadmap.

Next: Securing your endpoints and API keys.