JSON Patch Apply
Paste a JSON document and a JSON Patch array (per RFC 6902) and apply each operation in order. Supports `add`, `remove`, `replace`, `move`, `copy` and `test`. On a failed `test` operation, the index of the failing op is reported. Useful for previewing the effect of a patch before persisting it, or debugging patch generation. Runs entirely in your browser — free, online, no upload.
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Type
Patcher
Related tools
Tools that work with the same formats — most users open one of these next.
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Frequently asked
Is JSON Patch Apply free to use?
Yes. JSON Patch Apply is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — JSON Patch Apply runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does JSON Patch Apply work?
Open JSON Patch Apply, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.
Which browsers does JSON Patch Apply support?
Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. JSON Patch Apply uses standard web APIs and does not require any plugin, extension, or sign-up.