generated: '2026-08-14'
method: searched
source: >-
  https://fhir.epic.com/Documentation?docId=oauth2 (Epic on FHIR developer
  documentation), plus registry searches of npm, PyPI, RubyGems, NuGet, Maven
  Central, crates.io and pkg.go.dev for first-party Epic Systems client
  libraries.
note: >-
  Epic Systems publishes NO first-party client SDK for its FHIR APIs on any
  public package registry. This is a deliberate, documented posture rather than
  an oversight: Epic's own developer documentation lists third-party OAuth 2.0
  and FHIR libraries under a heading that explicitly disclaims them - "While it
  is not an exhaustive list, nor maintained or affiliated with Epic, the
  following resources might be helpful" - and points developers at the generic
  open-source SMART on FHIR ecosystem (the smart-on-fhir `fhirclient` library
  for single-page apps, AppAuth for native apps) instead of an Epic-branded
  package. Because Epic implements HL7 FHIR R4/STU3/DSTU2 and SMART on FHIR as
  published standards, any conformant FHIR client works against the Epic
  endpoints; the integration surface is the standard, not a vendor SDK. Registry
  searches surfaced only community and vendor packages (ngx-epic-fhir-client,
  n8n-nodes-epic-fhir-r4, medplum, fhir-kit-client, smart-on-fhir/client-js) -
  none published by Epic Systems Corporation. Recorded as an honest zero.
packages: []
package_count: 0
third_party_ecosystem:
  note: >-
    Recorded for context only. These are NOT Epic packages and carry no
    official: true. Two of the three are named in Epic's own documentation as
    unaffiliated references.
  referenced_by_epic_docs:
  - name: fhirclient
    registry: npm
    url: https://www.npmjs.com/package/fhirclient
    repository: https://github.com/smart-on-fhir/client-js
    publisher: SMART Health IT (Boston Children's Hospital)
    official: false
    context: Named in Epic's docs as a client-side OAuth 2.0 / SMART library option for single-page apps.
  - name: AppAuth
    registry: multiple
    url: https://appauth.io/
    publisher: OpenID Foundation
    official: false
    context: Named in Epic's docs as a native-app OAuth 2.0 library option.
  - name: health-cards-validation-SDK
    registry: github
    url: https://github.com/microsoft/health-cards-validation-SDK
    publisher: Microsoft
    official: false
    context: Named in Epic's SMART Health Cards documentation as an unaffiliated validation SDK.
registries_checked:
- registry: npm
  result: no first-party Epic Systems package
- registry: pypi
  result: no first-party Epic Systems package
- registry: rubygems
  result: no first-party Epic Systems package
- registry: nuget
  result: no first-party Epic Systems package
- registry: maven-central
  result: no first-party Epic Systems package
- registry: crates.io
  result: no first-party Epic Systems package
- registry: pkg.go.dev
  result: no first-party Epic Systems package