JSON Formatter

Format, validate and minify JSON with clear error messages.

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How it works

  1. 1

    Paste your JSON

    Paste raw or minified JSON into the input box.

  2. 2

    Format instantly

    It is re-indented with 2-space indentation as you type — no button to click.

  3. 3

    Fix errors

    If the JSON is invalid, the exact parser error message is shown so you can find and fix the problem.

  4. 4

    Copy the result

    Copy the formatted JSON, ready to paste back into your code or config file.

FAQ

Why does it say my JSON is invalid?
The formatter shows the exact error reported by the parser (e.g. an unexpected token and its position) so you can find and fix the problem.
Does this tool send my JSON to a server?
No — parsing and formatting happen entirely in your browser via JSON.parse, nothing is uploaded.

Tool4U.net — every tool runs in your browser. No file ever leaves your device unless the tool says so.

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