This module provides a pure Erlang support for JSON Patch (RFC 6902) and JSON Merge Patch (RFC 7396) specifications. Both provide mechanisms that permit patching of an existing update object using the HTTP PATCH method. This module supports the underlying patch functions (not the HTTP PATCH method itself).

The Target and Patch documents accept any structure JSON format supported by the ej module (http://github.com/seth/ej).

• ej_merge : The module implementing both patch functions

Below is an example using mochijson2 with the mergepatch function from RFC 7396.

A="{ "a": "b", "c": { "d": "e", "f": "g" } }". B="{ "a": "z", "c": { "f": null } }". ej_merge:mergepatch( mochijson2:decode(A), mochijson2:decode(B) ).

Related work:

*ej: Helper module for working with Erlang terms representing JSON