Medplum Mock Library

Provides the MockClient class and a large number of mocked endpoints and resources.

For example:

- GET fhir/R4/Patient/123 returns Homer Simpson
- GET fhir/R4/Practitioner/123 returns Dr. Alice Smith
- GET fhir/R4/Organization/123 returns Test Organization

Installation

Add as a dependency:

``bash
npm install @medplum/mock
`

Note the following peer dependencies:

- @medplum/core
- @medplum/fhir-router
- If you want to use JSONPatch:
- rfc6902
- If you want to use GraphQL:
- graphql
- dataloader

Usage

Create a new mock client:

`ts
const client = new MockClient();
`

Read a Patient resource:

`ts
const patient = await client.readResource('Patient', '123');
`

MockClient is API compatible with MedplumClient in @medplum/core. Please refer to MedplumClient` for full documentation on client capabilities.

About Medplum

Medplum is a healthcare platform that helps you quickly develop high-quality compliant applications. Medplum includes a FHIR server, React component library, and developer app.

License

Apache 2.0. Copyright © Medplum 2025