This workflow turns n8n into a small, well-behaved JSON API. A Webhook node listens for POST requests on the path contact-intake and hands the response over to Respond to Webhook nodes, so you decide exactly what the caller receives. A Code node checks the request body: name…
Written and tested by AltFTool
Incoming POST
Starts the workflow when an external service sends an HTTP request to a webhook URL.
Validate payload
Runs custom JavaScript to transform or manipulate the data flowing through the workflow.
Is valid?
Branches the workflow based on a true/false condition.
Respond 200 OK
Sends the workflow's response back to the caller of the webhook.
Respond 422 with errors
Sends the workflow's response back to the caller of the webhook.
This workflow turns n8n into a small, well-behaved JSON API. A Webhook node listens for POST requests on the path contact-intake and hands the response over to Respond to Webhook nodes, so you decide exactly what the caller receives.
A Code node checks the request body: name must be 2 to 100 characters, email must look like a real address, and the optional message must be under 2,000 characters. Values are trimmed and the email is lower-cased. Every problem is collected into an errors list instead of stopping at the first one.
An IF node then sends valid requests to Respond 200 OK, which returns the cleaned data, and invalid ones to Respond 422 with errors, which returns a list of field-level messages your front end can show next to each input.
name and email.FAQ
Copy the workflow JSON from this page, open the n8n editor, click on an empty canvas and paste with Ctrl+V (Cmd+V on macOS). You can also download the .json file and choose Import from File in the workflow menu. Save the workflow, then attach credentials before activating it.
It uses Webhook, Code, If and Respond To Webhook. Any node that connects to an external service needs your own credential — open each node after import and select or create one. Trigger, logic and transformation nodes usually need no credentials.
The workflow format is the same on both. If a node appears as unknown or outdated after import, update n8n to a recent version or, on self-hosted instances, install the required community node package. Features such as $env access are available on self-hosted instances only.
Start by changing the trigger (schedule, webhook or app event) and the destination nodes to match your stack — it is listed under Engineering. Edit prompts, field mappings and filters in the relevant nodes, use expressions like {{ $json.field }} to map data, and test with a manual execution before activating.
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This workflow is an interactive, hands-on tutorial designed to teach you the absolute basics of JSON (JavaScript Object Notation) and, more importantly, how to use it within n8n. It's perfect for…
by Lucas PeyrinThis template is an interactive, step-by-step tutorial designed to teach you the most important skill in n8n: using expressions to access and manipulate data. If you know what JSON is but aren't…
by Lucas Peyrinn8n is a trademark of n8n GmbH. AltFTool is not affiliated with, endorsed by or sponsored by n8n. Community templates are credited to their creators and link to the original listing; AltFTool originals are written and tested by the AltFTool team.