If your workflow starts with human input,
On form submission is one of the cleanest triggers in n8n.
You define:
- exactly what data is allowed in
- field names that become your JSON contract
- validation before any logic runs
No webhooks. No guessing payloads.
Just a controlled entry point.
My rule of thumb:
👉 Clean inputs first. Logic later.
If the JSON looks good here, the rest of the workflow becomes much easier to reason about.