How to deep copy JavaScript objects using structuredClone
The modern way to deep copy a JavaScript variable
For years and years we’ve had to use weird workarounds to do a deep clone of a JavaScript object.
Many of those were bug prone.
Like doing JSON.parse(JSON.stringify(obj)) where some types are be ignored.
Or worse, copying object properties by reference, introducing bugs down the road.
Today we have structuredClone() and it’s part of the DOM API.
It’s not part of JavaScript, it’s a DOM API.
It’s available in recent versions of all modern browsers:
It’s also available in Node.js 17+.
→ Get my Node.js Handbook
I wrote 19 books to help you become a better developer:
- HTML Handbook
- Next.js Pages Router Handbook
- Alpine.js Handbook
- HTMX Handbook
- TypeScript Handbook
- React Handbook
- SQL Handbook
- Git Cheat Sheet
- Laravel Handbook
- Express Handbook
- Swift Handbook
- Go Handbook
- PHP Handbook
- Python Handbook
- Linux Commands Handbook
- C Handbook
- JavaScript Handbook
- CSS Handbook
- Node.js Handbook