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JSON Validator

Validate JSON syntax with detailed error messages and line numbers.

Validate JSON Syntax

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// Validation result will appear here
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How to Validate JSON

  1. Paste or upload your JSON in the input area above.
  2. Click "Validate JSON" to check syntax and structure.
  3. Review results: See detailed error messages with approximate line numbers.
  4. Fix errors: Use the feedback to correct your JSON syntax.

JSON Validator Use Cases

  • API Testing: Validate API responses before processing.
  • Configuration Files: Check JSON config files for syntax errors.
  • Data Imports: Verify JSON data before importing to databases.
  • Learning: Understand JSON syntax errors and how to fix them.

Why Choose Our JSON Validator?

  • 100% Client-Side: Your JSON data never leaves your browser.
  • Detailed Errors: Get specific error messages with line numbers.
  • Structure Analysis: See data type and structure information.
  • Instant Results: No upload wait times—validation happens immediately.
  • Free & Unlimited: No registration, no file size limits, no paywalls.
100% Private Processing

Your JSON data is validated entirely in your browser. We never see, store, or transmit your files.