JSON Formatter
Format and validate JSON code.
Runs in browser
Validate, format, and minify JSON directly in the browser. Supports file upload, custom indentation, and download of formatted result.
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What does the JSON Formatter do?
This tool lets you validate, format (prettify), and minify JSON directly in the browser. You can paste content, load a .json file, and copy or download the result. All processing is done locally without sending data to the server.
Quick tips
- For large JSONs, prefer using the file upload option.
- If there is an error, the tool tries to indicate the approximate position of the problem (line and column).
- Use the "Minified" option to compress and save space in production.
- Choose indentation (2, 4 or 8 spaces) according to your formatting preference.
How to use
- Paste JSON in the input field or load a .json file.
- Choose the desired action: "Format" (prettify), "Minify" or "Validate".
- Adjust indentation if necessary (2, 4 or 8 spaces).
- Copy the result or download as .json file.
Frequently asked questions
Does the tool modify my original file?
No — the tool generates output in the "Result" field. The original file is not modified. You need to copy or download the result if you want to save it.
Does the tool support JSON with comments (JSONC)?
No. Strict JSON only according to RFC 8259 standard. Comments will cause parse error and validation will fail.
Is data sent to the server?
No. All processing is done locally in your browser — no data is sent to the server.