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JSON Formatter & Validator

Format, validate, and prettify your JSON data instantly. Real-time validation with exact error messages. Tree view and code view. Minify or prettify with custom indentation. Always free with no daily limits.

🔒 Processing happens in your browser — files are never uploadedFree · No sign-up required

How to Use

  1. 1Paste your JSON in the left panel
  2. 2See real-time validation (valid ✓ or errors with line numbers)
  3. 3Choose formatting: 2-space, 4-space, or minified
  4. 4Toggle Tree View to explore nested structures
  5. 5Copy formatted JSON or download as .json file
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Why use ShowPro's JSON Formatter & Validator?

🔒
100% Private
Files never leave your browser. Zero server uploads.
⚡
Instant Results
Processing happens locally — no waiting for uploads.
🆓
Completely Free
No account needed. Use 5 times per day, always free.

Frequently Asked Questions

What is JSON formatting?

JSON formatting (or 'prettifying') adds proper indentation and line breaks to make JSON data human-readable and easier to debug.

How do I know if my JSON is valid?

Our real-time validator shows a green checkmark for valid JSON or a red error with the exact position and line number where the issue is.

What's the difference between prettify and minify?

Prettify makes JSON readable with indentation. Minify removes all whitespace to create the smallest possible file size — great for production.

Can I format very large JSON files?

JSON files up to 1MB are processed instantly. Larger files work but may be slightly slower. No daily limits — this tool is always free.

Does my JSON get sent to a server?

No. All formatting and validation happens entirely in your browser. Your data is never shared or uploaded.