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Format & validate JSON.

Paste messy JSON and get it clean, indented and validated — or minify it. Everything stays in your browser.

Private — runs in your browser

Paste some JSON to format and validate it.

How it works

Drop in any JSON — from an API, a config file or a log.

Pretty-print with your chosen indent, or compact it to one line.

Validated and clean — copy it with one click.

Is my data sent anywhere?

No — parsing and formatting happen locally in your browser. Your JSON never leaves the page.

Does it tell me what’s wrong?

Yes — invalid JSON shows a clear error with the position so you can fix it fast.

Can it handle large JSON?

Yes, within your browser’s memory. Very large files (tens of MB) may be slower.

Link to this tool

Copy this snippet to link the tool from your own site:

<a href="https://anfedev.com/en/tools/json-formatter/">JSON Formatter — anfedev</a>

We build the integrations and custom software that move your data automatically — no more copy-paste. Let’s talk.

Free, no obligation — we reply within 24h.