TToolWox

JSON Formatter

JSON Formatter beautifies messy JSON into clean, indented, readable structure — or minifies it back to a single compact line. It also validates your input and shows a precise error message when the JSON is malformed.

It is perfect for inspecting API responses, cleaning up configuration files and debugging payloads. Parsing happens locally, so your data never leaves the browser.

Paste JSON — it formats automatically.
Input
Output

How to use JSON Formatter

  1. 1

    Paste your JSON

    Drop raw or minified JSON into the input box.

  2. 2

    Beautify or minify

    Choose 2- or 4-space indentation to pretty-print, or Minify to strip all whitespace.

  3. 3

    Copy the result

    If the JSON is valid you get formatted output; otherwise an error explains what went wrong.

Beautify vs minify

Beautifying adds indentation and line breaks so you can read nested structures at a glance — ideal during development and debugging. Minifying removes every unnecessary space and newline to shrink the payload, which is what you want before sending JSON over the network.

Both operations are lossless: the data is identical, only the formatting changes.

Validating JSON and reading errors

The tool parses your text with the same engine the browser uses, so anything it accepts is guaranteed to be valid JSON. When parsing fails, it surfaces the underlying message — for example an unexpected token or a missing comma — to help you locate the problem.

Common mistakes include trailing commas, single quotes instead of double quotes, and unquoted keys. None of these are allowed in strict JSON.

Frequently asked questions

Does this validate my JSON?
Yes. If your input cannot be parsed, the tool shows the error instead of output, so it doubles as a validator.
Is my JSON sent to a server?
No. Formatting and validation run entirely in your browser.
What indentation options are available?
You can beautify with 2 or 4 spaces, or minify to a single line with no whitespace.

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