JSON Beautifier

Make your ugly JSON data readable and perfectly aligned

0Bytes

Spacing:

Turn one-line JSON into something you can read

API responses, log lines and config exports often arrive as a single dense string of braces and quotes. Finding a value in that mess means squinting or scrolling sideways. The beautifier parses your JSON, then writes it back out with each key on its own line and nested objects stepped in, and colours the pieces so keys, strings, numbers, booleans and null values stand apart.

Beautifying step by step

Paste the text into the Raw JSON Content box. The Paste button pulls from the clipboard, and Load Sample JSON fills in a small server-status example.
Look at the Bytes figure in the header, which shows the size of what you entered.
Open the Spacing menu and choose 2 Spaces, 4 Spaces (the default) or Tabs.
Press Beautify JSON Data.
Take the output from the Beautified Result panel using Copy JSON, or press Download .json to save a file named beautified-json.json.

Behaviour worth knowing

The tool uses the browser's own JSON parser, so input must be strictly valid. Trailing commas, single-quoted strings, comments and unquoted keys are rejected, and you get a pop-up with the parser's message.
Whitespace in the original is ignored; only the data matters, so the output is normalised regardless of how the input was laid out.
Large integers beyond what JavaScript can hold exactly, such as long numeric IDs, may be rounded after parsing. Store those as strings if exact digits matter.
Colour highlighting is display only; copied and downloaded text is plain JSON.

Everyday uses

Reading a webhook payload or an API reply copied from a network inspector.
Making a minified package or settings file readable before editing it by hand.
Preparing a tidy example for documentation or a bug report.
Comparing two responses by eye once both have the same indentation.

Practical tips

If the parser complains, look at the position it mentions: the usual causes are a missing comma between items, a stray trailing comma, or quotes that were converted to curly quotes by a word processor. Choose Tabs if your editor or team convention uses them, and 2 spaces if the nesting is deep and you want narrower lines. Processing takes place in JavaScript in your browser, so very large documents may pause the page briefly. If you want the reverse, a compact single-line version, use a JSON minifier. To only check correctness without reformatting, a JSON validator gives a clearer verdict.

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Frequently Asked Questions

Why do I get an Invalid JSON message?

The parser is strict. Common causes are trailing commas, single quotes around strings, unquoted keys, comments, or curly quotes pasted from documents. The pop-up shows the parser's own message, which usually names the position of the first problem.

Does beautifying change my data?

The values stay the same, but formatting is regenerated from the parsed data. Duplicate keys collapse to the last one, and very large integers can lose precision because JavaScript numbers cannot hold every digit.

Can I use tabs instead of spaces?

Yes. The Spacing menu offers 2 Spaces, 4 Spaces and Tabs. Tabs produce one tab character per nesting level, which suits editors and projects that follow tab-based indentation, while spaces give a fixed width everywhere you paste it.

What file does Download .json create?

It saves the beautified text as beautified-json.json using your browser's normal download. The coloured highlighting is only shown on screen; the file itself contains plain JSON text that any editor or API can read.

Is there a maximum size?

The tool sets no fixed limit. Parsing happens in your browser, so speed depends on your device and memory. Extremely large files may make the tab slow, in which case split the data into smaller pieces.