FIRELY .NET SDK
The official HL7 FHIR SDK in .NET
Drive health interoperability and save precious development time with Firely’s open-source FHIR Software Development Kit
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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.
Get started today
Unleash the power of your data
// Find patients named Eve var client = new FhirClient("https://server.fire.ly"); 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.

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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Find out how Firely can help you bring FHIR to life
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