How to use this tool
- Paste JSON, upload a local file, or load a CORS-enabled public URL.
- Enter the source document and JSON Patch array, then run Apply JSON Patch.
- Review the result, then copy it or download it with the correct file type.
Private by default
Safe RFC 6902 JSON Patch Applier
Preview the complete patched document without mutating the source or traversing inherited JavaScript properties.
Your data stays in this browser
UTF-8Ln 1, Col 1
UTF-8—
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Your data stays in this browserInstantNo server round trips
PrivateBrowser-side processing
AuditableDocumented semantics
PortableCorrectly typed downloads
Category
JSON Patch Applier: How to use this tool
Validate and atomically apply all six RFC 6902 operations—add, remove, replace, move, copy, and test—with strict pointer rules.
Preview the complete patched document without mutating the source or traversing inherited JavaScript properties.
Open guide and examples
Example to try
Input JSON
{
"items": ["first", "third"],
"status": "draft"
}JSON Patch
[
{"op": "add", "path": "/items/1", "value": "second"},
{"op": "replace", "path": "/status", "value": "ready"},
{"op": "add", "path": "/meta", "value": {"version": 1}}
]Result
{
"items": [
"first",
"second",
"third"
],
"status": "ready",
"meta": {
"version": 1
}
}Learn
Frequently asked questions
Does this tool upload my JSON?
No. The transformation runs in your browser. URL import contacts only the address you explicitly enter.
What happens when the JSON is invalid?
The editor marks the likely location and keeps stale output out of the result pane.
What does JSON Patch Applier produce?
It validates every operation in order and returns a formatted result only when the entire patch applies successfully.
What limitation applies to JSON Patch Applier?
Malformed pointers, failed test operations, root removal, moves into descendants, and duplicate members are rejected without partial output.