Problem

To validate JQ expressions and YAML mapping today, we often have to install or enable an integration, wait for real events or sync cycles, and only then see whether mapping works. That makes iteration slow, noisy, and hard to automate.

We want to try mappings against sample payloads the same way we iterate in a normal dev loop (edit, run, fix), without standing up the full data path first.

What we need

A way to dry-run mapping (or the resources block) offline from live sync:

Paste or upload sample JSON that looks like the third-party API (per kind).

Apply the same JQ and mapping rules Port uses in production.

Get back clear results: resolved fields, relation validation errors, JQ errors, and so on.

Ideally this is available as an API or CLI so we can also run it from CI and in support or internal tools, not only in the browser.

Why it matters

Faster feedback means fewer broken syncs, shorter onboarding, and less trial and error in the live portal. Right now the install-and-wait step is the main blocker to testing JQ confidently.