JSON Formatter & Validator

Format, validate, diff, and convert JSON with tree view and YAML export

🔒 Files never leave your browser
Input 0 chars | 0 lines
Output 0 chars | 0 lines
Compare / Diff Mode

How to Use JSON Formatter & Validator

Paste your JSON

Paste or type your JSON data in the input area.

Format or validate

Click format to beautify, or see real-time validation errors.

Copy result

Copy the formatted JSON to your clipboard.

Why Choose AllTools JSON Formatter & Validator?

  • ✓ 100% free, no account needed
  • ✓ Files never leave your browser
  • ✓ Real-time validation
  • ✓ Syntax error highlighting
  • ✓ Minify and beautify modes
  • ✓ Interactive tree view with collapse
  • ✓ JSON to YAML conversion
  • ✓ Sort keys alphabetically
  • ✓ Remove null/empty values
  • ✓ JSON path finder (click to copy)
  • ✓ Diff/compare two JSON files
  • ✓ Upload and download .json files

Frequently Asked Questions

Is this JSON formatter free? ▼
Yes, completely free. No account, no subscription, no hidden fees. AllTools is supported by ads.
Does my JSON data get uploaded? ▼
No. Everything runs directly in your browser using JavaScript. Your data never leaves your device.
What JSON errors does it detect? ▼
It detects syntax errors like missing commas, unclosed brackets, invalid values, and trailing commas.
Can I minify JSON? ▼
Yes, switch to minify mode to remove all whitespace and produce compact JSON.
Is there a size limit? ▼
No strict limit. Large JSON files (10MB+) may be slower depending on your device.
Does this work on mobile? ▼
Yes, all AllTools tools are mobile-optimized and work on iOS and Android browsers.
What is the tree view? ▼
Tree view displays your JSON as an interactive, collapsible hierarchy. Click any node to expand/collapse it and click a path to copy the JSON path.
Can I convert JSON to YAML? ▼
Yes, click the YAML tab to convert your JSON to YAML format instantly. You can copy or download the result.
How does the diff/compare feature work? ▼
Paste two JSON objects side by side to see a highlighted diff showing added, removed, and changed values.
Can I upload a JSON file? ▼
Yes, drag and drop or click to upload a .json file. You can also download the formatted result as a .json file.

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