Validate that a workflow export imports cleanly — right inside n8n. Free community node.
Install it from Settings → Community Nodes and run two operations on any workflow JSON: Check (full diagnostic) and Verify (pass/fail verdict to gate a deploy). It catches leaked credentials, missing community nodes, version drift, broken connections and deprecated parameters — entirely inside your n8n, with no API, no network, and no credentials leaving the instance.
This is the free check. FlowProof Pro goes further — it repairs the workflow and issues a "FlowProof Checked" certificate: fp.akuchis.com.
Full install and usage in the README on GitHub.