jsondiffpatch

What is jsondiffpatch?

The jsondiffpatch npm package is a tool for computing the difference between two JSON objects and applying those differences to other JSON objects. It is useful for tasks such as data synchronization, version control, and change tracking in JSON data structures.

What are jsondiffpatch's main functionalities?

Diff

This feature computes the difference between two JSON objects. In this example, the difference between the 'left' and 'right' objects is calculated, resulting in a delta that shows the change in the 'age' property.

const jsondiffpatch = require('jsondiffpatch');
const left = { name: 'John', age: 30 };
const right = { name: 'John', age: 31 };
const delta = jsondiffpatch.diff(left, right);
console.log(delta);

Patch

This feature applies a delta (difference) to a JSON object to produce a new JSON object. In this example, the delta is applied to the 'left' object, resulting in the 'right' object with the updated 'age' property.

const jsondiffpatch = require('jsondiffpatch');
const left = { name: 'John', age: 30 };
const delta = { age: [30, 31] };
const right = jsondiffpatch.patch(left, delta);
console.log(right);

Unpatch

This feature reverts a JSON object to its previous state by applying the inverse of a delta. In this example, the delta is used to revert the 'right' object back to the 'left' object.

const jsondiffpatch = require('jsondiffpatch');
const right = { name: 'John', age: 31 };
const delta = { age: [30, 31] };
const left = jsondiffpatch.unpatch(right, delta);
console.log(left);

Reverse

This feature computes the inverse of a delta, which can be used to revert changes. In this example, the inverse of the delta is calculated, which can then be used to revert the changes made by the original delta.

const jsondiffpatch = require('jsondiffpatch');
const delta = { age: [30, 31] };
const reverseDelta = jsondiffpatch.reverse(delta);
console.log(reverseDelta);

Other packages similar to jsondiffpatch

deep-diff

The deep-diff package provides similar functionality for computing differences between JavaScript objects. It offers a more granular approach to detecting changes, including additions, deletions, and modifications. However, it does not provide built-in patching and unpatching capabilities like jsondiffpatch.

diff

The diff package is a general-purpose text and data comparison tool that can be used to compute differences between strings, arrays, and objects. While it is versatile and widely used, it lacks the specialized JSON diffing and patching features provided by jsondiffpatch.

fast-json-patch

The fast-json-patch package focuses on applying JSON Patch operations as defined by RFC 6902. It is optimized for performance and provides a simple API for applying and validating JSON patches. However, it does not compute differences between JSON objects, which is a key feature of jsondiffpatch.

README

The README file is missing