How to Format and Validate JSON Online

Invalid JSON breaks APIs and apps. This tool catches syntax errors and shows exactly where the problem is.

  1. Open JSON Formatter
  2. Paste your messy JSON
  3. Click Format
  4. View prettified, validated JSON
Open JSON Formatter

Frequently Asked Questions

Is this free?

Pay what you want. Most users pay $2. No subscriptions.

Do I need to install software?

No. Everything runs in your browser. No downloads, no installs.

Is my data safe?

Yes. All uploads are auto-deleted after 1 hour.