About JSON Formatter

Free online JSON formatter, validator, and beautifier. Format, minify, and validate JSON instantly with tree view and syntax highlighting. No signup required.

Features

  • Real-time validation as you type
  • Syntax highlighting for easier reading
  • Multiple indent options (2, 4, 8 spaces)
  • 100% client-side - your data never leaves your browser
  • Multiple view modes: Text, Tree, Table, TypeScript

Pro Tips

  • Drag & drop .json files directly onto the input panel
  • Resize panels by dragging the center divider
  • Use ⌘K to quickly search for any tool
  • Tree view lets you collapse nested objects for easier navigation
  • Auto-repair can fix common JSON errors automatically

Reference

Common JSON Errors to Avoid

  • Missing double quotes around keys (use "key" not key)
  • Trailing commas after the last item in objects/arrays
  • Single quotes instead of double quotes
  • Unescaped special characters in strings
  • Comments in JSON (not allowed in standard JSON)

Frequently Asked Questions

How do I format JSON?

Paste your JSON into the input field and click "Format". You can customize the indentation level (2 or 4 spaces, or tabs).

Is this JSON formatter free?

Yes, this JSON formatter is completely free to use with no signup required.

Is my JSON data secure?

Yes, absolutely! All processing happens locally in your browser using JavaScript. Your JSON data never leaves your device or gets sent to any server. We take privacy seriously.

Can I compare two JSON files?

Yes, use the Compare tab in the right panel to paste a second JSON and see the differences highlighted.

What's the maximum JSON file size I can format?

There is no hard limit, but for optimal performance, we recommend files under 5MB. Very large files (over 10MB) may cause your browser to slow down. For huge datasets, consider using command-line tools.

Why am I getting a "Invalid JSON" error?

Common causes include: missing quotes around keys, trailing commas after the last item, using single quotes instead of double quotes, unescaped special characters, or having comments in your JSON. Check the error message for the specific line number.

Can I repair broken JSON automatically?

Yes! Click the "Auto-repair" button when you have invalid JSON. It can fix common issues like trailing commas, single quotes, unquoted keys, and missing quotes. Note that some complex errors may still require manual fixing.

What are the different view modes?

Text shows formatted JSON with syntax highlighting. Tree view displays a collapsible hierarchy for exploring nested structures. Table view presents array data in rows and columns. TypeScript generates interface definitions, and Schema infers the JSON Schema.

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