JSON Formatter
Paste your JSON below, or upload a .json file, to instantly format, beautify and validate it. Everything happens locally in your browser — nothing is sent to a server. If your JSON is invalid, you'll get the exact line and column of the problem instead of a generic error.
How to use the JSON Formatter
- Paste or type your JSON into the box above, or click Upload file to load a .json file directly.
- It formats automatically as you type or upload, or click Format.
- Choose 2 spaces, 4 spaces or a tab for indentation, and optionally sort keys alphabetically.
- Use Copy or Download to grab the result, or Minify to collapse it to one line.
Frequently asked questions
Is this JSON Formatter free to use?
Yes, it is completely free with no sign-up or usage limits.
Is my data uploaded anywhere?
No. All formatting and validation happens locally in your browser using JavaScript — your JSON is never sent to a server.
What's the difference between formatting and validating JSON?
Formatting rewrites your JSON with consistent indentation so it is easier to read. Validating just checks whether the JSON is syntactically correct. This tool does both: if your JSON is invalid, it shows you exactly where the error is instead of formatting it.
Can I sort the keys of my JSON object?
Yes, enable the "Sort keys" option to alphabetically sort all object keys recursively before formatting.
Can I upload a JSON file instead of pasting it?
Yes, click "Upload file" and choose a .json or .txt file. It is read directly in your browser and formatted automatically — the file itself is never sent anywhere.