Generate workflows from OpenAPI specs using an AI HTTP design endpoint

Quick overview

This workflow exposes a webhook that accepts an OpenAPI spec (inline or via URL), optionally fetches the spec, sends it to an external AI design endpoint, optionally validates and stores the generated design via HTTP APIs, then returns a packaged n8n workflow JSON and documentation.

How it works

1. Receives a POST request via an n8n webhook containing an OpenAPI specification or an OpenAPI URL plus generation preferences.
2. Validates the incoming payload, extracts context like workflow name and auth preference, and prepares URLs used for downstream HTTP calls.
3. Calls an external HTTP endpoint to fetch the OpenAPI document when a spec URL is provided (and continues even if the fetch fails).
4. Sends the prepared context to an external AI design HTTP endpoint to generate a proposed n8n workflow structure.
5. Calls external HTTP endpoints to validate the generated workflow design and to store/register the generated integration.
6. Assembles a final response package with status flags, documentation, and a generated workflow JSON skeleton, then returns it to the webhook caller with an appropriate HTTP status code.

Setup

1. Configure where the workflow should send requests by replacing the placeholder httpbin.org URLs in the validation code with your real OpenAPI fetcher, AI workflow designer, validator, and storage endpoints.
2. If your external endpoints require authentication, add the required credentials/headers to the HTTP Request steps.
3. Activate the workflow and copy the production webhook URL, then configure your client to POST openApiSpec or openApiUrl along with optional fields like workflowName and preferredAuth.