Textoolz

JSON Formatter & Validator

Format, beautify, and validate JSON data online. Free JSON formatter with configurable indentation that instantly highlights syntax errors.

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The JSON Formatter & Validator parses your JSON data and re-formats it with clean, readable indentation. Paste minified or messy JSON and instantly get a well-structured output with your preferred indent size.

This tool also acts as a JSON validator — if your input contains syntax errors such as missing commas, unquoted keys, or trailing commas, you'll see a clear error message pinpointing the problem. It's perfect for debugging API responses, editing config files, or preparing JSON data for documentation.

All processing runs entirely in your browser. Your JSON data is never sent to any server, making it safe for sensitive data like API keys or configuration secrets.

How to Use JSON Formatter & Validator

  1. 1Paste your JSON data into the input area above.
  2. 2Select your preferred indentation size (2 spaces, 4 spaces, or tab).
  3. 3The formatted JSON appears instantly in the output area.
  4. 4Click the Copy button to copy the formatted JSON to your clipboard.

Frequently Asked Questions

What does the JSON formatter do?▾
The JSON formatter parses your JSON input and outputs it with consistent indentation and line breaks, making it easy to read and edit. It also validates the JSON syntax and reports errors if the input is invalid.
Can this tool validate JSON?▾
Yes. If your JSON has syntax errors like missing quotes, trailing commas, or mismatched brackets, the tool will display a descriptive error message instead of formatted output.
Is my JSON data secure?▾
Absolutely. All formatting and validation happens in your browser using JavaScript. Your data never leaves your device — nothing is sent to a server.
What indent options are available?▾
You can choose between 2 spaces, 4 spaces, or tab indentation. The default is 2 spaces, which is the most common convention in modern JSON files.