Transform

Apply JSON Patch

Apply an RFC 6902 patch to a JSON document and see the result.

Document first, then the patch array

Settings

Output

Result appears here after you select

{ } How to use

  1. Paste the document, then the patch array.
  2. Select Process.
  3. The patched document comes back, or a message naming the operation that failed.

{ } How it works

Apply JSON Patch works on the text you provide. Adjust the options, then select Process ▸ and it runs entirely in your browser — nothing is uploaded to a server — then shows the result in the Output panel.

Inputs

  • Document first, then the patch array — paste or type your input in the left panel (use Sample for an example)
  • Indentation — choose one — Minified, 2 spaces, 4 spaces (default: 2 spaces)

Output

JSON — copy it, download it, or switch the Output panel to Tree view to explore it.

{ } Common uses

  • See what a patch will do before sending it anywhere.
  • Work out why a patch an API rejected does not apply.
  • Replay a recorded change onto a document by hand.

{ } Limitations

  • Supports add, remove and replace. A patch using move, copy or test is refused by name rather than partly applied.
  • Replace fails on a member that does not exist, as the specification requires. That is what turns a typo in a path into an error instead of a new field appearing.

{ } FAQ

Is my data uploaded to a server?

No. Everything runs locally in your browser — your files never leave your device.

Can I process more than one file at once?

This tool works on one input at a time.

Is this tool free?

Yes — it’s completely free and needs no sign-up.

Why did replace fail on a path that looks right?

Because replace is defined as failing when the member is not there — it changes something, it does not create it. Use add if the property may be missing. A typo in a path would otherwise silently add a field nobody asked for.

What happens if one operation fails half way through?

Nothing is returned. The document is rebuilt from a copy, so a failure leaves you with the original rather than something half-patched that is neither the before nor the after.

What does the "-" in a path mean?

The end of an array. `/skills/-` with add appends, which saves you having to know how long the array already is.