This is a Haskell library for parsing and applying JSON Patches From https://www.json.org/: JSON Patch is a format for describing changes to a JSON document. It can be used to avoid sending a whole document when only a part has changed. When used in combination with the HTTP PATCH method, it allows partial updates for HTTP APIs in a standards compliant way. The patch documents are themselves JSON documents. JSON Patch is specified in RFC 6902 from the IETF.