JSON Formatter

Paste messy, minified JSON and turn it into clean, indented output. Choose 2 or 4 spaces or tabs, and optionally sort object keys.

Your data is formatted locally in your browser and never sent to a server.

How to use JSON Formatter

  1. Paste your JSON into the input box.
  2. Choose the indentation and whether to sort keys.
  3. Press “Format”.
  4. Copy the formatted output.

About this tool

JSON from APIs and logs is often one long line that is hard to read. The formatter re-indents it according to your settings and highlights any syntax problem with a clear message.

All processing happens in your browser, which makes the tool safe for configuration files, API responses and other sensitive data.

When to use it: reading API responses, config files and logs that arrive as one long line.

Frequently asked questions

What does “sort keys” do?
It alphabetizes the keys of every object in the document, which makes two JSON documents easier to compare.
Why do I get a syntax error?
JSON is strict: keys must be in double quotes, trailing commas are not allowed, and values like undefined or comments are invalid. The error message shows the position of the problem.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks for humans; minifying strips whitespace for smaller downloads. This tool offers both.
Does formatting change my data?
No — only whitespace changes (and key order, if you enable sorting). Every value stays exactly the same.
Can I use it for API responses?
Yes — paste the raw response to read it comfortably. Sorting keys makes two responses easy to compare line by line.
How large a document can it format?
Large payloads are fine; for multi-megabyte JSON a desktop browser feels snappier since the whole tree is re-rendered.

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How to use Json Formatter

Paste your code, data, or URL into the Json Formatter input area. Select the appropriate mode or option, then process. The formatted or converted output appears clearly and can be copied or saved.

Practical benefits

Frequently asked questions

Is this tool free to use?
Yes. Json Formatter is fully free with no account or subscription required.
Does it upload my files?
No. All processing occurs locally within your browser session.
Can I use this for professional projects?
Yes, the tool is designed for both casual and professional use. Always verify critical outputs.