Web Tools

JSON Patch Generator

Generate, apply, and validate JSON Patch (RFC 6902) documents. Diff two JSON values to produce add, remove, replace, move, copy, and test operations with RFC 6901 JSON Pointer paths. Apply patches to documents and validate patch structure. Runs entirely in your browser — your data never leaves your machine.

json patch diff rfc6902 rfc6901 api

Published May 30, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Paste a source and target JSON document to generate a JSON Patch that transforms the source into the target. The tool produces RFC 6902-compliant operations with RFC 6901 JSON Pointer paths.

Modes

Generate Patch: diff two JSON documents to produce patch operations
Apply Patch: apply a JSON Patch array to a document
Validate Patch: check if a JSON Patch array is structurally valid per RFC 6902

Operations (RFC 6902)

add: add a value at a path
remove: remove a value at a path
replace: replace a value at a path
move: move a value from one path to another
copy: copy a value from one path to another
test: test that a value exists at a path

Features

RFC 6902 compliant: standard JSON Patch format
RFC 6901 JSON Pointer: proper path encoding with ~0 and ~1 escaping
Recursive diff: handles deeply nested objects and arrays
Color-coded operations: visual distinction between add (green), remove (red), replace (yellow), move/copy (blue)
Raw JSON output: copy the full patch as JSON
Roundtrip verification: apply generated patches to verify correctness
7 examples: simple changes, nested objects, arrays, multi-field updates
Private: runs entirely in the browser — no data transmitted

Use Cases

Generating API patch payloads for PATCH endpoints
Understanding differences between JSON document versions
Building and testing JSON Patch operations for REST APIs
Validating patch documents before applying them
Learning about RFC 6902 JSON Patch format