[nradov]

The wire format is a bit messy and hard to read. But developers mostly work through libraries like HAPI which have a decent API.

https://hapifhir.github.io/hapi-hl7v2/

[eclipxe]

HAPI is amazing.

[djfobbz]

Last Published: 2017-06-23...is it still active?

[viraptor]

HL7 has different lifetime to JS-framework-of-the-week. It doesn't really change since the software itself is updated at most every year. (not including small patches)