FHIRKit Client

Node FHIR client library

Features

• Support for R4 (4.0.1, 4.0.0, 3.5.0, 3.3.0, 3.2.0), STU3 (3.0.1, 1.8.0, 1.6.0, 1.4.0, 1.1.0) and DSTU2 (1.0.2)
• Support for all FHIR REST actions
• Support for FHIR operations
• Typescript support
• Pagination support for search results
• Batch and transaction support
• Support for absolute, in-bundle, and contained references
• Metadata caching on client instance
• SMART security support
• Capability-checking tool based on server capability statements
• Minimal dependencies
• Contemporary async/await structure
• Modern ES6 Classes
• TDD with Mocha
• URL polyfill (so it works in client-only apps without much trouble)
• Support optional parameters for the request, such as TLS key and cert

Roadmap

Project roadmap uses Github Projects.

Typescript Support

There is now early Typescript support for this library. This library is intended to be agnostic to the version of FHIR, but there is a WIP pattern to use with @types/fhir.

Assume a project where you did the following setup:

> npm install fhir-kit-client
> npm install -D @types/fhir

Now in your code, you can:

import Client from 'fhir-kit-client'

const client = new Client({ baseUrl: 'http://foo.com' })

const isPatient = (resource: fhir4.Resource): resource is fhir4.Patient => {
  return resource.resourceType === 'Patient'
}

client
  .read({resourceType: 'Patient', id: '12'})
  .then(res => {
    if (isPatient(res)) {
      console.dir(res.name, { depth: 4})
    }
  })

This example uses a type guard for R4 Patient. If you are building an app that connects to systems with different versions, you could write a wrapper for each fhir version in your app.

Examples

Examples using promises...

const Client = require('fhir-kit-client');
const fhirClient = new Client({
  baseUrl: 'https://sb-fhir-stu3.smarthealthit.org/smartstu3/open'
  });

// Get SMART URLs for OAuth
fhirClient.smartAuthMetadata().then((response) => {
  console.log(response);
  });


// Direct request
fhirClient.request('Patient/123')
  .then(response => console.log(response));

fhirClient.request('Patient/123', { method: 'DELETE' })
  .then(response => console.log(response));

// Read a patient
fhirClient
  .read({ resourceType: 'Patient', id: '2e27c71e-30c8-4ceb-8c1c-5641e066c0a4' })
  .then((response) => {
    console.log(response);
  });


// Search for patients, and page through results
fhirClient
  .search({ resourceType: 'Patient', searchParams: { _count: '3', gender: 'female' } })
  .then((response) => {
    console.log(response);
    return response;
  })
  .then((response) => {
    console.log(response);
    return fhirClient.nextPage(response);
  })
  .then((response) => {
    console.log(response);
    return fhirClient.prevPage(response);
  })
  .catch((error) => {
    console.error(error);
  });

Examples using async/await...

const Client = require('fhir-kit-client');
const fhirClient = new Client({
  baseUrl: 'https://sb-fhir-stu3.smarthealthit.org/smartstu3/open'
  });

async function asyncExamples() {
  // Get SMART URLs for OAuth
  let response = await fhirClient.smartAuthMetadata();
  console.log(response);


  // Read a patient
  response = await fhirClient
    .read({ resourceType: 'Patient', id: '2e27c71e-30c8-4ceb-8c1c-5641e066c0a4' });
  console.log(response);


  // Search for a patient with name matching abbott, then paging
  let searchResponse = await fhirClient
    .search({ resourceType: 'Patient', searchParams: { name: 'abbott ' } })
  console.log(searchResponse);

  searchResponse = await fhirClient.nextPage(searchResponse);
  console.log(searchResponse);

  searchResponse = await fhirClient.prevPage(searchResponse);
  console.log(searchResponse);
}

asyncExamples();

For more examples see the JS Docs and Launch Examples below.

Documentation

JSDoc-generated documentation with plenty of examples

Launch Examples (SMART, CDS Hooks)

To see how to follow launch and authorization workflows for FHIR applications, see the examples directory and examples README.

Example React App

FHIRKit Create React App provides a create-react-app template that can be used to create a sample React app using FHIRKit Client.

Even more Examples (client-side ones)

See https://github.com/Vermonster/fhir-kit-client-examples for examples in React, Angular, and React Native.

Logging

The debug library can provide logging during development. Two different logging namespaces are provided, fhir-kit- client:info logs each request and response, and fhir-kit-client:error logs errors. To enable logging during development, add one of the namespaces to the DEBUG environment variable, or use fhir-kit-client:* to enable both.

$ DEBUG=fhir-kit-client:* node smart-launch.js

Contributing

FHIRKit Client is an open source Node.js FHIR client library that welcomes community contributions with enthusiasm.

All are welcome to participate. By participating in this project, you agree to follow the Code of Conduct.

Please see our Contributing document for more details on how to get started.

License

MIT

Copyright (c) 2018 Vermonster LLC