There are 3 repositories under x12 topic.
omniparser: a native Golang ETL streaming parser and transform library for CSV, JSON, XML, EDI, text, etc.
List of EDI (Mostly) Github Resources
EDIReader is a flexible and lightweight EDI parser, written in pure Java with many integration options. It has handled millions of transactions in a wide variety of products, services, industries, platforms, and custom integrations. Available as the open source Community Edition and the Premium Edition with added-value modules.
A curated list of awesome EDI (Electronic Data Interchange) tools & libraries, products, blogs, and other resources.
Cut through the Crap, with Machete, a text parser, object mapper, and query engine.
The OpenEDI Specification defines a standard, language-agnostic, and format-agnostic interface to all EDI and HL7 messaging standards, allowing them to be used with HTTP APIs by both humans and computers.
Next-gen EDI parser in Antlr4 grammar compiled by antlr4ts
PHP Library for creating EDI X12 ANSI 270 File 5010 Version
ASC-X12 EDI Debatcher. Work in progress (99% complete, but probably good enough to use).
EdiNation web toolkit and ASP .NET Core APIs for EDI integrations - EdiFabric
X12 Electronic Data Interchange Solidity Contracts, with support for 4010 and select manifests like 211, 850, 213, 856, 997 & more
Amazon Vendor Central Service Provider
X12/EDIFACT EDI Interchange Library