diffsonjs

A javascript JSON diff and patch implementation of the RFC-6902. This library refers to diffson.

Install

npm install diffsonjs

Usage

var diffsonjs = require('diffsonjs');

var left = {a: 1, b: true};
var right = {a: 2};

var delta = diffsonjs.diff(left, right);
console.log(delta);
// [
//   { op: 'replace', path: '/a', value: 2 },
//   { op: 'remove', path: '/b' }
// ]

var result = diffsonjs.patch(left, delta);
console.log(result);
// {a: 2}

API

diff(json1, json2, options?)

Compute the diff between two json objects.

diff options

interface DiffOptions {
    omitArrayDiffs?: boolean // default false, different arrays are represented by repleacement.
    remember?: boolean // default false, set the previous value as `oldValue` property for replacement or movement.
    equals?: (left: unknown, right: unknown) => boolean // if it exists, use it instead of the normal json comparison function.
    hashCode?: (value: any) => number // if it exists, it is used to speed up comparison of arrays.
}

patch(json, delta, options?)

Apply a patch to json and return the result.

patch options

interface PatchOptions {
    equals?: (left: unknown, right: unknown) => boolean // if it exists, use it for tests.
}