JSON Formatter & Validator, private, in-browser

Format, validate and beautify JSON without uploading.

Indent:
Input
Output

How to json formatter with Berlvis

  1. 1
    Paste JSON

    Anything, request bodies, config files, API responses.

  2. 2
    See it formatted

    Live, as you type.

  3. 3
    Copy

    Pretty-printed output to clipboard.

About JSON Formatter

Most online JSON formatters paste your payload to a server and log it. For anyone handling API keys, customer data or unpublished schemas, that's a leak waiting to happen. Berlvis JSON Formatter parses and re-stringifies your JSON entirely in the browser. If it's invalid, you see the exact parser error in red.

Frequently asked questions

+Is JSON Formatter really free?

Yes. Every Berlvis tool is free, with no signup, no email and no daily quota.

+Do you upload my files or data?

Never. Your file stays in your browser, nothing is uploaded, nothing is logged, nothing leaves your device.

+Will it work on my phone?

Yes, anywhere there's a modern browser (Chrome, Safari, Firefox, Edge, Brave, Arc).

+How accurate is the calculation?

We use the same formulas you'd find in official guidance and primary tax/regulatory sources. Numbers are calculated client-side so what you see is what's used, nothing hidden.