A leaner and meaner implementation of JSON-Patch. Small footprint. High performance.

NEW! Dual directions! Supports both applying patches and generating patches.

JSON-Patch allows you to update a JSON document by sending the changes rather than the whole document. And now there is a standard way to do it. JSON Patch plays well with the HTTP PATCH verb (method) and REST style programming.

Mark Nottingham has a nice blog about it.

0.5 KB minified and gzipped (1.1 KB minified)

• Allows you to apply patches on object trees for incoming traffic.
• Allows you to freely manipulate object trees and then generate patches for outgoing traffic.
• ES6/7 Object.observe() is used when available.

• The project will monitor the updates to the draft specification.
• A /bin directory will be added with minified versions
• Node.js module
• More unit tests

Include "json-patch.js" if you want support for applying patches or include "json-patch-duplex.js" if you also want to generate patches.

Applying patches:

var myobj = { firstName:"Albert", contactDetails: { phonenumbers: [ ] } };
var patches = [
   {op:"replace", path:"/firstName", value:"Joachim" },
   {op:"add", path:"/lastName", value:"Wester" }
   {op:"add", path:"/contactDetails/phonenumbers", value:{ number:"555-123" }  }
   ];
jsonpatch.apply( myobj, patches );
// myobj == { firstName:"Joachim", lastName:"Wester", contactDetails:{ phoneNumbers[ {number:"555-123"} ] } };

Generating patches:

var myobj = { firstName:"Joachim", lastName:"Wester", contactDetails: { phonenumbers: [ { number:"555-123" }] } };
observer = jsonpatch.observe( object );
myobj.firstName = "Albert";
myobj.contactDetails.phonenumbers[0] = "123";
myobj.contactDetails.phonenumbers.push({number:"456"});
jsonpatch.generate(observer);
// patches  == [
//   { op:"replace", path="/firstName", value:"Joachim"},
//   { op:"replace", path="/contactDetails/phonenumbers/0", value:"123"},
//   { op:"add", path="/contactDetails/phonenumbers", value:{number:"456"}}];