fastest-deep-clone-json

This is the fastest deep-clone implementation for JSON objects - faster than structuredClone, JSON.parse(JSON.stringify(obj)) and other implementations.

This package is ESM-only.

- Dependencies: 0
- Bundle size (minified and gzipped): 316 Bytes
- Module count: 1

It avoids recursion in favor of a stack, in order to keep the memory usage low.

Performance comparison

| Method | Ops/sec |
|-------------------------------------------------------------------------------------------------------------------|-----------|
| This package (iterative deep clone) | 3.560.061 |
| recursive deep clone | 3.476.448 |
| fastest-json-copy v2 | 1.523.427 |
| JSON.stringify | 1.465.516 |
| fastest-json-copy v1 | 1.320.249 |
| jsondiffpatch.clone | 1.245.459 |
| structuredClone | 789.100 |

Run it yourself: https://www.measurethat.net/Benchmarks/ShowResult/534839 (this package is deepCopyObjectIterative in that comparison)

Installation

``bash
pnpm install fastest-deep-clone-json
`
or

`bash
npm install fastest-deep-clone-json
`

Usage

`ts
import { deepCloneJson } from 'fastest-deep-clone-json';

const obj = { a: 1, b: { c: 2 } };

const cloned = deepCloneJson(obj);

console.log(cloned); // { a: 1, b: { c: 2 } }
`

This library will only work with JSON-serialized objects. It does not handle data types like Date, Map, Set, BigInt, Symbol, Function` etc etc. The goal is to provide the fastest deep-clone implementation for JSON objects.