The official HL7 FHIR SDK in .NET  

Drive health interoperability and save precious development time with Firely’s open-source FHIR Software Development Kit

FHIR API illustration

Get a running start in implementing FHIR the right way 

Fully compliant to the latest HL7 FHIR standard

Firely is the original author and main contributor of the official HL7 FHIR reference implementation for Microsoft .NET.

Speed up implementation time

Download the NuGet packages of the SDK and you’ll have your first FHIR client running within an hour.

Open-source and trustworthy SDK

The open source library has been downloaded millions of times by developers around the world.

Lower the amount of coding for your team

Build your own FHIR client, server or add-on without having to implement all the basic and advanced FHIR features from scratch.

Unleash the power of your data

// Find patients named Eve

var client = new FhirClient("");
Bundle results = await client.SearchAsync<Patient>(new string[] { "family:exact=Eve" });
// Just get the first patient

var pat_A = result.Entry[0].Resource as Patient;
// Add a name to the patient, and update

pat_A.Name.Add(new HumanName().WithGiven("Christopher").AndFamily("Brown"));
var updated_pat = client.Update(pat_A);

  • Serialization and deserialization to XML and JSON  
  • Snapshot generation, validation and caching 
  • Set up complex resource resolving scenarios  

Join the Firely .NET SDK Workshop

Learn how to implement FHIR with the Firely .NET SDK and maximize its full potential. Are you creating your own FHIR App? This course is perfect for you.

HL7 FHIR Overview Training Course

Bring into play for Interoperability Regulations

21st Century Cures Act 

Achieve stress-free compliance for ONC’s Cures Act with our FHIR Server, FHIR API and FHIR training courses

Interoperability and Patient Access Rule

Implement a Patient Access API or your FHIR API-based Provider Directory for the CMS Final Rule

Are you also looking for a FHIR Server?

Power your online portal, app or database with Firely server.

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Firely Server

Power your online portal, mobile app, or database with a superior, turn-key FHIR server

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Build your data model and tailor-fit it to your specific needs with Forge

Easily collaborate with your team on FHIR projects and access FHIR data models around the world 

Find out how Firely can help you bring FHIR to life

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