Validate and deduplicate booking requests from forms via webhook

by Vlotstroom ✓ · 0 views · created 2026-10-07 · Support Chatbot

What this workflow does

This workflow has 14 nodes and runs when an HTTP POST request hits its webhook URL. It uses only n8n's built-in nodes.

How it runs

Trigger: When an HTTP POST request hits its webhook URL.

1. Normalize + validate fields (Code): runs custom JavaScript code
2. Valid? (If): checks a condition and branches into true / false
3. Slot bookable? (If): checks a condition and branches into true / false
4. Log rejected request (Code): runs custom JavaScript code
5. Duplicate request? (Code): runs custom JavaScript code
6. Respond decline (Respond to Webhook): sends the response back to the webhook caller
7. Respond invalid (Respond to Webhook): sends the response back to the webhook caller
8. Fresh request? (If): checks a condition and branches into true / false
9. Create booking (replace me) (Code): runs custom JavaScript code
10. Skip duplicate (Code): runs custom JavaScript code

…plus 3 more steps. See the full node list below.

Before you upgrade to n8n 3.0

Nodes used (4)

• Webhookn8n-nodes-base.webhook
• Coden8n-nodes-base.code
• Ifn8n-nodes-base.if
• Respond to Webhookn8n-nodes-base.respondToWebhook

From the author

Quick Overview This workflow accepts booking requests via an n8n webhook, validates and normalizes the submitted fields, enforces a lead-time booking policy, and blocks duplicate submissions before creating a booking and preparing a confirmation message for…

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