JSON Diff Patch

Deep diff and patch JSON objects. RFC 6902 compliant.

Installation

npm install json-diff-patch

Usage

import { diff, patch, applyPatch } from 'json-diff-patch';

const original = {
  name: 'John',
  age: 30,
  address: { city: 'NYC' }
};

const modified = {
  name: 'John',
  age: 31,
  address: { city: 'LA' },
  email: 'john@example.com'
};

// Generate diff (RFC 6902 format)
const operations = diff(original, modified);
// [
//   { op: 'replace', path: '/age', value: 31 },
//   { op: 'replace', path: '/address/city', value: 'LA' },
//   { op: 'add', path: '/email', value: 'john@example.com' }
// ]

// Apply patch
const result = patch(original, operations);

// Or apply incrementally
let doc = original;
for (const op of operations) {
  doc = applyPatch(doc, op);
}

Features

• RFC 6902 compliant
• Deep object comparison
• Array diff support
• Immutable operations
• TypeScript-first
• Zero dependencies

License

MIT