JSON-Diff

JSON-Diff is to diff two JSON object and generate the patch, which is compliant to JSON Patch RFC6902.

You can use JSON-Diff to

• diff two JSON object
• apply patches to get JSON

JSON-Diff is able to handle operations:

Object

• add
• remove
• replace
• copy
• move

Array

• add
• remove
• replace
• copy
• move
• permutation

INSTALL

npm

npm install json-diff-rfc6902 --save

bower

bower install json-diff-rfc6902 --save

• json-diff-rfc6902.js main bundle
• jdr global variable

API

var jdr = require('json-diff-rfc6902');

// diff the two JSON objects to get the pathes
var jdr_patch = jdr.diff(f_old, f_new [, options]);

// The third parameter is optional, use the object options.
// Default:
options.OBJ_COM = true   // Generate copy and move for object
options.ARR_COM = true   // Generate minimal patch for array
options.HASH_ID = null   // manually set the hash value

// For example, if options.HASH_ID = "title", it will get the property value "title" of the elements in the array, and use them as the hash value to execute the operations transformation algorithem.
var jdr_patch = jdr.diff(f_old, f_new, {OBJ_COM: true, ARR_COM: true, HASH_ID: "title"});

// apply the patches to the f_old object
jdr.apply(f_old, jdr_patch);

TEST

npm install -g mocha

npm install -g fast-json-patch jiff json8-patch rfc6902

cd tests

node diff.js

mocha

Test 1

OBJ_PROP_INS

This is an object where a property is added.

Test 2

OBJ_PROP_DEL

This is an object where a property is removed.

Test 3

OBJ_PROP_MOD

This is an object where a property value is modified.

Test 4

OBJ_PROP_CPY

This is an object where a property is copied.

Test 5

OBJ_PROP_REN

This is an object where a field is renamed.

Test 6

ARR_OBJ_UNSHIFT

This is an array of objects with a insertion at the beginning of the array.

Test 7

ARR_OBJ_PUSH

This is an array of objects with a insertion at the end of the array.

Test 8

ARR_OBJ_RINS

This is an array of objects with a insertion in the middle of the array.

Test 9

ARR_OBJ_SHIFT

This is an array of objects with a deletion of the first element.

Test 10

ARR_OBJ_POP

This is an array of objects with a deletion of the last element

Test 11

ARR_OBJ_RDEL

This is an array of objects with a deletion of the moddle element

Test 12

ARR_OBJ_BREPLACE

This is an array of objects with a replacement of the first element

Test 13

ARR_OBJ_EREPLACE

This is an array of objects with a replacement of the last element

Test 14

ARR_OBJ_MREPLACE

This is an array of objects with a replacement of the middle element

Test 15

ARR_OBJ_CPY

This is an array of objects where a object is copied.

Test 16

ARR_OBJ_PERM1

Permutation of a objects in an array of objects. [a, b, c] => [a, c, b]

Test 17

ARR_OBJ_PERM2

Permutation of a objects in an array of objects. [a, b, c] => [b, c, a]

Test 18

ARR_OBJ_PERM3

Permutation of a objects in an array of objects. [a, b, c] => [b, a, c]

Test 19

ARR_OBJ_PERM4

Permutation of a objects in an array of objects. [a, b, c] => [c, b, a]

Test 20

ARR_OBJ_PERM5

Permutation of a objects in an array of objects. [a, b, c] => [c, a, b]

Test 21

ARR_OBJ_MOD

This is an array of objects where every object is added a field.