JSON Formatter

JSON Formatter

Paste JSON below to format, minify, validate, copy, or download it.

The JSON Formatter makes JSON data easy to read, check, and clean up. JSON is the format that websites, apps, and APIs use to share information, but it often arrives as one long, crowded line with no spaces or breaks. Reading that kind of text is slow and mistakes are easy to miss. This free tool turns messy JSON into neat, indented code, shrinks tidy JSON back into a compact single line, and checks whether the data is valid at all.

All processing happens locally in your browser. Your JSON is never uploaded to a server, which makes this tool safe for testing data, configuration files, and API responses during everyday development and learning.

How to use

  1. Paste or type your JSON into the first box.
  2. Choose an indent size, two or four spaces, if you plan to format the data.
  3. Click Format for a readable version, Minify for a compact version, or Validate to only check for errors.
  4. If there is a mistake, read the error message, fix the problem in your text, and try again.
  5. Use Copy Result to copy the output, or Download to save it as a .json file.

Frequently asked questions

What does Validate actually check?

Validate tries to read your text using the standard JSON rules. If it succeeds, your JSON is valid. If it fails, the tool shows the browser's error message, which usually names the problem and its position, such as a missing comma, a trailing comma, or unquoted text.

What is the difference between Format and Minify?

Format adds line breaks and indentation so people can read the structure easily. Minify removes all unnecessary spaces and breaks, producing the smallest version, which is useful before sending data or saving space in a file.

Is my data sent anywhere?

No. The tool uses only the JSON tools built into your browser. Nothing leaves your device, nothing is saved, and refreshing the page clears everything.

Why does my JSON show an error?

Common causes are single quotes instead of double quotes, missing commas between items, extra commas at the end, or comments inside the data. JSON is strict, so even one wrong character will stop it working.


 

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