This repo is a minimal setup to test the HAPI FHIR JPA Server (Java) using the $validate operation exposed by a HAPI FHIR server. It spins up:

• A HAPI FHIR server container
• A tiny Node.js service that calls the server's $validate endpoint

Reference: hapifhir/org.hl7.fhir.core

• Docker (and Docker Compose v2: docker compose)

1. Start the stack (builds the Node image and starts both services):

docker compose up --build

1. When up, you can access:

• HAPI FHIR UI: http://localhost:8080/
• HAPI FHIR REST base: http://localhost:8080/fhir
• Validator API (Node): http://localhost:3001

• Health check:

curl http://localhost:3001/health

• Validate a default sample Patient (server performs $validate):

curl http://localhost:3001/validate | jq

• Validate your own resource by POSTing FHIR JSON:

curl -X POST http://localhost:3001/validate \
  -H "Content-Type: application/fhir+json" \
  -d '{
    "resourceType": "Patient",
    "name": [{ "family": "Doe", "given": ["Jane"] }],
    "gender": "female",
    "birthDate": "1990-01-01"
  }' | jq

The Node service supports the following environment variables (already set in docker-compose.yml):

• FHIR_BASE_URL: Base URL of the HAPI FHIR server (defaults to http://hapi:8080/fhir inside Compose)
• PORT: Port for the Node service (defaults to 3001)

docker compose down

• This project is only for quick validation testing against a local HAPI FHIR server.
• For details about the HAPI FHIR core and validator, see the official repository: hapifhir/org.hl7.fhir.core.