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JSON Formatter & Validator — Free Online

Beautify, Validate, and Minify JSON Instantly

Format messy JSON into readable code with proper indentation. Validate JSON and get clear error messages for invalid syntax. Minify JSON to reduce size. View JSON as a collapsible tree structure.

⚡
Instant
Seconds to process
🔒
Secure
Files never stored
🆓
100% Free
No account needed
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How to Use JSON Formatter

1

Paste your JSON in the input box

2

Click Format to beautify or Minify to compress

3

See validation status and any errors

4

Copy formatted JSON

Frequently Asked Questions

Paste your JSON and click Validate. If there are errors, we show the exact line and character where the error occurs.
Yes! Click Minify to remove all whitespace and get the smallest possible JSON string.
You can format and validate JSON up to 5MB in size for free.
We show the exact error location to help you fix issues, and offer auto-fix for common mistakes like trailing commas.

Learn More

dev
Best Free Developer Tools Online 2025 — JSON, Base64, UUID & More
6 min read
dev
Why Is My JSON Invalid? Common JSON Errors Explained (and How to Fix Them)
5 min read

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