Playground
A browser-safe sandbox key, a live FHIR R4 endpoint, and fabricated patients already loaded. Nothing here touches real patient data — every response is capped, expires in 14 days, and is tagged X-Huli-Mode: sandbox.
No sandbox token set
Get one from the "Open the playground" link on your key-reveal page, or paste a sandbox token here. Never a production key — sandbox keys are verified before they're saved, and a production key is rejected. Once verified, it's stored in sessionStorage on this origin and sent with every request this page runs. See Sandbox quickstart if you don't have one yet.
Your first request
Search for a patient. Once it succeeds, capture a real id from your sandbox and carry it into a recipe — or head to your sandbox patients for a curated roster.
/fhir/R4/Patient?_count=5Set your sandbox token above to run this request.
Where to next
- Your sandbox patients — a curated roster fetched live from your sandbox, with what each patient carries.
- Reference console — every operation the Public API exposes, generated from the OpenAPI spec.
- Search-param builder — click together a FHIR search query and run it.
- Recipes — end-to-end workflows with runnable steps and request chaining, starting with Sandbox quickstart.