fast-json-patch
Fast implementation of JSON-Patch (RFC-6902) with duplex (observe changes) capabilities
jsondiffpatch
JSON diff & patch (object and array diff, text diff, multiple output formats)
yaml-diff-patch
Apply a JSON diff/patch to YAML while preserving whitespace, comments and overall structure
json-patch
A JavaScript implementation of the JSON Object Notation (JSON) Patch http://tools.ietf.org/html/rfc6902 and JSON Pointer http://tools.ietf.org/html/rfc6901 specifications.