See https://github.com/cujojs/jiff/issues/22#issuecomment-65739638

1-test.js

var jiff = require('jiff');

var p = [{"op":"test","path":"/messages/0","value":{"id":"QJ951IQ-","time":"2014-12-05T02:24:31.880Z","userId":"7yjrlN0x","text":"q","thread":"default","isThread":false,"user":{"name":"chen","avatar":"http://tp1.sinaimg.cn/1651843872/180/40048616024/1","nickname":"chen","thread":"default","id":"7yjrlN0x","online":true}}},{"op":"remove","path":"/messages/0"},{"op":"add","path":"/messages/2","value":{"id":"71D0JL7b","time":"2014-12-05T02:25:33.729Z","userId":"7JHrWpG-","text":"r","thread":"default","isThread":false,"user":{"name":"yong","avatar":"http://tp3.sinaimg.cn/1346257214/50/1269085478/0","nickname":"yong","id":"7JHrWpG-","thread":"default","online":true}}}];

var d1 = {"messages":[{"id":"QJ951IQ-","time":"2014-12-05T02:24:31.880Z","userId":"7yjrlN0x","text":"q","thread":"default","isThread":false,"user":{"name":"chen","avatar":"http://tp1.sinaimg.cn/1651843872/180/40048616024/1","nickname":"chen","thread":"default","id":"7yjrlN0x","online":true}},{"id":"mJR6kUmW","time":"2014-12-05T02:25:23.932Z","userId":"7yjrlN0x","text":"x","thread":"default","isThread":false,"user":{"name":"chen","avatar":"http://tp1.sinaimg.cn/1651843872/180/40048616024/1","nickname":"chen","thread":"default","id":"7yjrlN0x","online":true}},{"id":"X1-CJLQ-","time":"2014-12-05T02:25:26.900Z","userId":"7yjrlN0x","text":"t","thread":"default","isThread":false,"user":{"name":"chen","avatar":"http://tp1.sinaimg.cn/1651843872/180/40048616024/1","nickname":"chen","thread":"default","id":"7yjrlN0x","online":true}}],"threads":[],"user":{"name":"chen","avatar":"http://tp1.sinaimg.cn/1651843872/180/40048616024/1","nickname":"chen","thread":"default","id":"7yjrlN0x","online":true}};

var d2 = jiff.patch(p, d1);

console.log('-- PATCH -----------------');
console.log(p);

console.log('-- BEFORE -----------------');
console.log(d1);

console.log('-- AFTER -----------------');
console.log(d2);

out.txt

-- PATCH -----------------
[ { op: 'test',
    path: '/messages/0',
    value: 
     { id: 'QJ951IQ-',
       time: '2014-12-05T02:24:31.880Z',
       userId: '7yjrlN0x',
       text: 'q',
       thread: 'default',
       isThread: false,
       user: [Object] } },
  { op: 'remove', path: '/messages/0' },
  { op: 'add',
    path: '/messages/2',
    value: 
     { id: '71D0JL7b',
       time: '2014-12-05T02:25:33.729Z',
       userId: '7JHrWpG-',
       text: 'r',
       thread: 'default',
       isThread: false,
       user: [Object] } } ]
-- BEFORE -----------------
{ messages: 
   [ { id: 'QJ951IQ-',
       time: '2014-12-05T02:24:31.880Z',
       userId: '7yjrlN0x',
       text: 'q',
       thread: 'default',
       isThread: false,
       user: [Object] },
     { id: 'mJR6kUmW',
       time: '2014-12-05T02:25:23.932Z',
       userId: '7yjrlN0x',
       text: 'x',
       thread: 'default',
       isThread: false,
       user: [Object] },
     { id: 'X1-CJLQ-',
       time: '2014-12-05T02:25:26.900Z',
       userId: '7yjrlN0x',
       text: 't',
       thread: 'default',
       isThread: false,
       user: [Object] } ],
  threads: [],
  user: 
   { name: 'chen',
     avatar: 'http://tp1.sinaimg.cn/1651843872/180/40048616024/1',
     nickname: 'chen',
     thread: 'default',
     id: '7yjrlN0x',
     online: true } }
-- AFTER -----------------
{ messages: 
   [ { id: 'mJR6kUmW',
       time: '2014-12-05T02:25:23.932Z',
       userId: '7yjrlN0x',
       text: 'x',
       thread: 'default',
       isThread: false,
       user: [Object] },
     { id: 'X1-CJLQ-',
       time: '2014-12-05T02:25:26.900Z',
       userId: '7yjrlN0x',
       text: 't',
       thread: 'default',
       isThread: false,
       user: [Object] },
     { id: '71D0JL7b',
       time: '2014-12-05T02:25:33.729Z',
       userId: '7JHrWpG-',
       text: 'r',
       thread: 'default',
       isThread: false,
       user: [Object] } ],
  threads: [],
  user: 
   { name: 'chen',
     avatar: 'http://tp1.sinaimg.cn/1651843872/180/40048616024/1',
     nickname: 'chen',
     thread: 'default',
     id: '7yjrlN0x',
     online: true } }