Free tools

JSON Formatter

Format and validate JSON directly in your browser.

Runs locally · nothing is uploaded

Formatted JSON appears here…

How to use

1

Paste your JSON into the input box.

2

Click Format for readable output, or Minify for a compact one.

3

Copy the result with one click.

About this tool

A JSON formatter takes raw, hard-to-read JSON and pretty-prints it with consistent indentation, so you can actually see the structure of the data. It also works as a validator: if the input is not valid JSON, you get the exact parse error instead of silent failure.

Use it when you are debugging an API response, inspecting a config file, or preparing JSON for documentation. The Minify action does the opposite job, stripping whitespace to make payloads as small as possible.

This tool is built by ToolClack and, like everything we make, it is local-first: your data stays in your browser.

Frequently asked questions

Is my data uploaded anywhere?

No. The formatter runs entirely in your browser with JavaScript; your JSON never leaves your device.

Is the tool free?

Yes, completely free, with no signup and no usage limits.

Does it work offline?

Once the page is loaded, yes: formatting needs no network connection at all.

Can I use large files?

Yes, within what your browser can hold in memory. Multi-megabyte JSON files are usually fine.

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