JSON Patch (RFC 6902) is a format for describing changes to a JSON document. It allows you to compare two JSON objects and generate a standardized diff that shows exactly what changed between them.

Is this JSON Patch tool free to use?

Yes, this JSON Patch generator is completely free to use. All processing happens in your browser, so your data stays private and secure.

RFC 6902 is the IETF standard that defines JSON Patch. It specifies operations like add, remove, replace, move, copy, and test for describing changes to JSON documents.

Can I use JSON Patch in REST APIs?

Yes, JSON Patch is commonly used in REST APIs for partial updates. Instead of sending entire objects, you can send only the changes, which is more efficient and reduces bandwidth.

What are the 6 JSON Patch operations?

The 6 JSON Patch operations are: add (insert value), remove (delete value), replace (update value), move (relocate value), copy (duplicate value), and test (verify value before patching).

JSON Patch Generator

Pick what you want to do - generate an RFC 6902 JSON Patch from two documents, apply an existing one, or verify it round-trips. Everything runs directly in your browser.

Your JSON stays in your browser. Transformations run locally. Hosting and cookieless analytics requests still occur; share links put encoded editor state in the URL.

Compare two documents and create the RFC 6902 patch between them.

Source JSON

Target JSON

Output appears below - copy and share live under the patch panel. Press Ctrl+↵ to run.

JSON Patchoutput

Generate a patch and it will appear here

Tested round trip

Verified 19 September 2026 with fast-json-patch 3.1.1: comparing { "version": 1 } with { "version": 2 } produced { "op": "replace", "path": "/version", "value": 2 }, and applying it produced the expected document. A failing test returned TEST_OPERATION_FAILED.

Why choose our generator?

Built for speed, privacy, and reliability.

Instant Results

Generate RFC 6902 patches in milliseconds. No waiting, no loading screens. Everything happens client-side.

Privacy First

Your JSON data never leaves your browser. We don't store or transmit your code.

Developer Ready

Professional code editor features with syntax highlighting, formatting, and shareable URLs.

Learn More About JSON Patch

Complete Documentation

Master JSON Patch with our comprehensive guide. Learn all RFC 6902 operations and best practices.

Read the Docs →

Real-World Examples

See JSON Patch in action with practical examples like shopping carts and user updates.

Try Examples →

Language Guides

Use JSON Patch in JavaScript, Python, Go and Java, or compare it with JSON Merge Patch.

Browse all guides →

JavaScript Python Go Java Merge Patch

Advanced JSON Editing & Patch Generation

Professional JSON Input

Professional code editor with syntax highlighting, validation, and bracket matching for seamless JSON editing and comparison.

Real-time JSON validation
Bracket matching & indentation
Error highlighting & suggestions

Instant Patch Generation

See RFC 6902 patches generated in real-time as you modify your JSON. Perfect for API development and learning.

Live diff visualization
Copy patches with one click
Shareable URLs for collaboration

Everything you need to know about JSON Patch

What is JSON Patch (RFC 6902)?

JSON Patch is a format for describing changes to a JSON document. Think of it as Git diff, but for JSON. It's defined by RFC 6902 and lets you express modifications like “add this field”, “remove that array item”, or “replace this value” in a standardized way.

Perfect for REST APIs, real-time collaboration, and efficient data synchronization.

When should you use JSON Patch?

API Updates: Send only what changed instead of entire objects
Real-time Apps: Sync changes between users efficiently
Version Control: Track document changes over time
Database Ops: Update only modified fields in NoSQL databases
State Management: Efficient updates in React, Vue, or Angular apps

What is a JSON Patch generator?

A JSON Patch generator is an online tool that automatically creates RFC 6902 patch operations by comparing two JSON objects. Instead of manually writing patch operations, you input your “before” and “after” JSON, and the generator produces the exact operations needed for the transformation.

Why use an online generator? It eliminates human error, handles complex nested changes, ensures RFC 6902 compliance, and works instantly in your browser.