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JSON Formatter

Format, validate and minify JSON — pretty-print it or collapse it to one line.

Parsed and formatted in your browser — nothing is uploaded.

How to JSON Formatter

  1. 1

    Paste your JSON

    Drop in the JSON you want to check or tidy.

  2. 2

    Format or minify

    Format pretty-prints it with your chosen indent; Minify collapses it to one line. Invalid JSON shows the error.

  3. 3

    Copy the result

    Copy the formatted output to your clipboard.

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JSON Formatter — frequently asked questions

Is my JSON sent to a server?+

No. It's parsed and formatted entirely in your browser with JSON.parse.

It says invalid JSON — why?+

The message shows where parsing failed. Common causes: trailing commas, single quotes, or unquoted keys — none of which are valid JSON.

Can it handle large files?+

Yes, within your browser's memory. Very large files may be slow to render.

Do you upload my files to a server?+

No — every tool here processes your files entirely on your device, and nothing is uploaded to a server. The only exception is the AI tools, which send the extracted text (not the file) to Claude to do their work.

Is there a file size limit?+

There's no artificial limit we impose, but since processing happens in your browser, very large files (500+ MB or 1,000+ pages) are limited by your device's memory rather than by us.