Looking for a "Postman for HL7 and FHIR"?
Postman is excellent at what it does: sending HTTP requests and inspecting responses. HL7v2 messages and FHIR resources have structure and conformance rules that a generic API client was never meant to understand.
You can absolutely hit a FHIR server with Postman. What Postman will not do is parse an HL7v2 pipe-delimited message into segments, validate a resource against US Core, or map a v2 message to a FHIR resource.
Interoperall is the healthcare-native version of that workbench: parse and validate HL7v2, validate and explore FHIR, run FHIRPath, and map between the two. Runs entirely client-side in your browser. PHI never leaves your device, so there is nothing to upload and no data-processing agreement to negotiate for a quick check.
Where each tool fits
| Capability | Interoperall | a general-purpose API client |
|---|---|---|
| Generic REST / GraphQL calls | Not the focus | Excellent |
| Parse HL7v2 into segments / fields | Yes | No (it is raw text to Postman) |
| HL7v2 structure validation | Yes | No |
| FHIR resource validation (US Core, etc.) | Yes | No conformance awareness |
| Run FHIRPath expressions | Yes | No |
| HL7v2 to FHIR mapping | Yes | No |
| Where data is processed | Client-side, in your browser | Requests leave your machine by design |
Who each option is best for
Interoperall
Anyone debugging or building HL7v2 and FHIR interfaces. It understands the formats: segment-level HL7v2 parsing, FHIR conformance validation, FHIRPath, and v2-to-FHIR mapping in one place.
a general-purpose API client
Teams testing generic REST endpoints and auth flows. For collections, environments, scripting, and raw HTTP testing, a general-purpose API client is the right tool.
Where Interoperall fits
Think of Interoperall as the format-aware companion to your API client. Use the API client to exercise endpoints; use Interoperall to understand, validate, and transform the healthcare payloads themselves.
For interface work the day-to-day loop is: parse a v2 message, validate it, map it to FHIR, then validate the FHIR resource against a profile. That whole loop lives in Interoperall, client-side.
Frequently asked questions
Can Postman validate FHIR resources?
Postman can send a resource to a FHIR server and show the response, but it has no built-in understanding of FHIR conformance, so it cannot tell you whether a resource meets a profile like US Core on its own.
Can Postman parse HL7v2?
No. To Postman an HL7v2 message is just a text body. It does not split it into MSH/PID/PV1 segments or validate the structure.
What does Interoperall do that a generic API client does not?
It parses HL7v2 into segments and fields, validates FHIR against profiles, runs FHIRPath, and maps HL7v2 to FHIR. It is built for healthcare formats rather than generic HTTP.
Do I still need an API client?
Often yes. Use your API client for raw HTTP testing and auth; use Interoperall for the healthcare-payload work it is not designed for.