How to Send a Webhook from Google Forms (Apps Script)

Google Forms is great at collecting responses but has no native webhooks — there's no field where you paste a URL. The fix is a few lines of Google Apps Script that POST each response to your endpoint. This guide shows the correct, minimal setup, and avoids a step you'll see in other tutorials that you don't actually need. (New to webhooks? See what is a webhook.)

The approach

Every Google Form can have a bound Apps Script. We'll:

1. Add a function that turns a submitted response into JSON and POSTs it with UrlFetchApp.
2. Wire it to an installable "On form submit" trigger so it runs on every submission.

That's it — no "Deploy as web app" step. (Deploying as a web app is for receiving HTTP requests, not for sending one on submit; adding it here just exposes an endpoint you don't need.)

Step 1 — open the script editor

In the form editor, click the ⋮ (three dots) menu (top-right, near Send) → Apps Script. This opens a script bound to your form.

Step 2 — add the code

Replace the default contents with this, and set ENDPOINT_URL to your webhook URL:

const ENDPOINT_URL = 'https://your-endpoint.example.com/webhook';

function onFormSubmit(e) {
  const payload = {};
  // e.response is the FormResponse for THIS submission
  e.response.getItemResponses().forEach(function (item) {
    payload[item.getItem().getTitle()] = item.getResponse();
  });
  payload.submittedAt = e.response.getTimestamp();

  UrlFetchApp.fetch(ENDPOINT_URL, {
    method: 'post',
    contentType: 'application/json',
    payload: JSON.stringify(payload),
    muteHttpExceptions: true,
  });
}

Using the event object e.response is more reliable than fetching "the latest response" from the form — it's exactly the submission that fired the trigger, with no race conditions.

Step 3 — add an installable trigger

This is the step that trips people up. Because UrlFetchApp needs authorization, a simple trigger won't work — you need an installable one:

1. In the Apps Script editor, click the Triggers icon (the alarm clock) in the left sidebar.
2. Add Trigger.
3. Choose function onFormSubmit, event source From form, event type On form submit.
4. Save, then authorize the script when Google prompts (you'll approve the permissions once).

Step 4 — test it

First, capture what the form sends by pointing ENDPOINT_URL at a free Webhook Bin — submit a test response and you'll see the exact JSON arrive. Then switch ENDPOINT_URL to your real handler.

Where the webhook goes next

Once your form responses are flowing as webhooks, Webhook Relay can route them anywhere: transform each submission and fan it out to multiple destinations, or deliver to a service on your own machine.

• Webhook to Google Sheets — log every submission to a sheet.
• Webhook to Slack or Discord — get notified on each response.
• Receive it on localhost — drive a local handler with real submissions.

Ready to turn form submissions into webhooks? Grab a free Webhook Bin to see your first one, or start forwarding for free.