EDIParser

EDIParser is an open-source .NET 8 library for parsing and generating X12, HL7, and EDIFACT messages.

The library exposes a hierarchical message model:

Message
└── Segment
    └── Field
        └── Repetition
            └── Component
                └── SubComponent

Start here

• Getting Started
• Parser Model
• X12 Guide
• HL7 Guide
• EDIFACT Guide
• Sample Projects
• API Reference

Supported formats

Format	Status
X12	Supported
HL7 v2 delimiter-based messages	Supported
UN/EDIFACT	Supported
NCPDP SCRIPT	Not included in the verified .NET 8 Core

Indexing convention

The public parser API preserves the original one-based EDI indexing convention. For example, field 3 is addressed as field 3, even though internal CLR collections are zero-based.