JSON Formatter & Beautifier

Paste your JSON and instantly pretty-print, validate, and beautify it with proper indentation. Catch syntax errors with exact line and column numbers.

Free, no signup — runs securely in the browser, so your API responses and config files never leave your device.

Paste your JSON here

Indent:

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How to Format JSON Online

Turn messy, minified JSON into clean, readable output in three steps.

Paste Your JSON

Drop in a minified, single-line, or messy JSON string — an API response, config file, or log entry.

Format & Validate

Click Format to pretty-print with 2 or 4 space indentation. Any syntax error is flagged with its line and column.

Copy or Download

Copy the clean JSON to your clipboard or download it as a .json file in one click.

// before

{"id":1,"tags":["a","b"],"ok":true}

// after

{
  "id": 1,
  "tags": ["a", "b"],
  "ok": true
}

✅

Syntax Validation

Instantly detects JSON errors and shows the exact line and column where the problem is.

📐

Indent Control

Choose between 2-space or 4-space indentation to match your coding style.

⚡

Instant Download

Copy to clipboard or download the formatted JSON as a .json file in one click.

Frequently Asked Questions

What does the JSON Formatter do?

It parses your JSON and pretty-prints it with proper indentation so it's easy to read, review, and debug. Paste a minified or messy single-line response and get clean, structured output instantly.

Can I choose the indent size?

Yes. You can choose between 2-space or 4-space indentation to match your project's coding style or linter rules.

What happens if my JSON has errors?

The formatter validates as it parses and shows the exact error with line and column information, so you can find and fix issues like trailing commas or unquoted keys quickly.

Is my JSON data safe and private?

Yes. Formatting happens in your browser — your JSON is never stored or sent to a third party, which is ideal for API responses and config files that may contain sensitive values.