The EDI-flavored JSON formats are purpose-built projections that sit between Chain.io and an EDI translation engine, which serializes them to X12 or EDIFACT. They are a distinct use case from the canonical standard document specifications.
Each format documents the JSON shape a specific Chain.io EDI adapter uses, with a full field reference and a worked example. For the mapping from an X12 transaction set or EDIFACT message to the Chain.io adapter you configure, see the EDI Transaction Set to Adapter Mapping article in the Chain.io Help Center.