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🔍 Free Online JSON Formatter & Validator

Format, validate, and minify JSON for API payloads and webhook testing. 100% free, secure, and runs entirely in your browser!

✨Key Features

  • ✓Format JSON with custom indentation
  • ✓Validate JSON syntax in real-time
  • ✓Minify JSON to single line
  • ✓Copy formatted output instantly
  • ✓Detailed error messages with line/column

🎯Perfect For

  • →Debugging API payload errors
  • →Inspecting webhook requests
  • →Cleaning up minified JSON
  • →Pre-flight validation before API calls
  • →Testing JSON in CI/CD pipelines

🔒100% Secure & Private

Your JSON data stays in your browser. No uploads to servers. No data stored or logged.

  • ✓Client-side processing only
  • ✓No server uploads
  • ✓GDPR compliant

How to Use

1

Paste JSON

Paste or type your JSON into the editor

2

Format or Validate

Click Format, Minify, or Validate

3

View Results

See formatted output or validation results

4

Copy & Send

Copy to clipboard or send to RequestBin

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Frequently Asked Questions

How can I format JSON online?

Paste your JSON into the editor and click the Format button. The tool will pretty-print your JSON with proper indentation, making it easy to read.

How do I validate JSON before sending it to an API?

Enter your JSON and click Validate. The tool instantly checks syntax and shows any errors with line and column information, so you can fix issues before sending.

Does this JSON formatter store my data?

No. All processing happens in your browser. We never upload, store, or log your JSON data. Everything is client-side only.

Can I minify JSON?

Yes. Click the Minify button to compress your JSON into a single line by removing all unnecessary whitespace while preserving functionality.

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