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Online JSON Validator & Syntax Checker

Validate RFC 8259 JSON syntax instantly. Identifies exact line and column numbers of syntax errors, unescaped characters, missing commas, trailing commas, and unquoted object keys.

⚡ Quick Answer

A JSON Validator checks JSON data against standard syntax rules, reporting whether the JSON is valid or pinpointing the exact line and character where a syntax error occurred.

💡 How It Works

Attempts parsing via native engine, intercepts parse exceptions, and calculates line/column coordinates from error stack pointers.

📖 How to Use JSON Validator

  1. Paste your JSON data into the validation area.
  2. If errors exist, inspect the highlighted line and error badge.
  3. Correct the highlighted issue and verify the green
  4. confirmation badge.

✨ Key Features

  • Line and column number error indicator
  • Clear diagnostic explanations (e.g.
  • )
  • 100% private local validation

❓ Frequently Asked Questions

Why are trailing commas disallowed in JSON?

The official JSON standard (RFC 8259) prohibits trailing commas to ensure unambiguous parsing across all programming languages.