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SmaftyTools

JSON Formatter

Format, validate and beautify JSON online. Free JSON formatter with indentation options and key sorting — runs entirely in your browser.

Formatted JSON

Formatted JSON will appear here

About JSON Formatter

The JSON Formatter helps you format, validate and beautify JSON data in seconds. Paste raw or minified JSON and get clean, readable output with your preferred indentation — perfect for debugging API responses, reviewing configuration files or preparing data for documentation.

Invalid JSON is caught instantly with a clear error message that points to the problem, so you can fix typos like missing commas, unquoted keys or trailing brackets fast. You can also sort object keys alphabetically to make large payloads easier to compare, or minify JSON to strip whitespace before shipping it.

Everything runs client-side in your browser, so even sensitive payloads never leave your device.

How to Use the JSON Formatter

  1. Paste or type your JSON into the input pane.
  2. Choose an indentation level (2 spaces, 4 spaces or tabs) and toggle key sorting if needed.
  3. The formatted result appears instantly in the output pane — fix any validation errors shown inline.
  4. Click Copy to grab the formatted JSON, or minify it for production use.

Features

  • Instant formatting and validation as you type
  • Configurable indentation and alphabetical key sorting
  • Minify mode to compress JSON for production
  • Clear, inline error messages for invalid JSON

Frequently Asked Questions

What is a JSON formatter?

A JSON formatter takes raw or minified JSON text and pretty-prints it with consistent indentation and line breaks, making the structure easy to read. It also validates the syntax and reports errors.

Can it handle large JSON files?

Yes. Because processing happens locally in your browser, the formatter handles large payloads quickly — there is no upload step or server round-trip.

Is the JSON Formatter free?

Yes, the JSON Formatter is completely free with no usage limits. No signup, no account and no installation required.

Is my data safe?

Yes. All processing happens locally in your browser using JavaScript — nothing you type is uploaded or stored on our servers.

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