JSON Validator

Free Online JSON Validator & Syntax Checker

Validate JSON data, detect syntax errors with detailed error messages, and ensure your JSON is properly formatted. Get instant feedback with line numbers and fix suggestions.

Real-time validation Detailed error messages Line number detection Fix suggestions

JSON Validator Tool

Enter JSON data to validate

Format Instead

Common JSON Errors & How to Fix Them

❌ Common Syntax Errors

Missing Quotes

{name: "John"} // ❌ Wrong {"name": "John"} // ✅ Correct

Trailing Comma

{"name": "John",} // ❌ Wrong {"name": "John"} // ✅ Correct

Single Quotes

{'name': 'John'} // ❌ Wrong {"name": "John"} // ✅ Correct

✅ Validation Tips

Use Double Quotes

Always use double quotes for strings and property names in JSON.

No Trailing Commas

Remove commas after the last element in objects and arrays.

Valid Data Types

Use string, number, boolean, null, object, or array types only.

JSON Validator Features

Advanced JSON validation with detailed error reporting

Real-time Validation

Instant validation as you type with immediate feedback on JSON syntax errors.

Detailed Error Messages

Get precise error descriptions with line numbers and suggestions for fixing issues.

Auto-Fix Suggestions

Receive intelligent suggestions to automatically fix common JSON syntax errors.

How to Validate JSON Online

Step-by-Step Guide

  1. Paste your JSON: Copy and paste your JSON data into the input field.
  2. Real-time validation: The validator will automatically check your JSON as you type.
  3. Review errors: If errors are found, they'll be displayed with line numbers and descriptions.
  4. Fix and revalidate: Make corrections based on the error messages and validate again.

JSON Validation Best Practices

  • Use proper quotes: Always use double quotes for strings and property names.
  • Check brackets: Ensure all opening brackets have corresponding closing brackets.
  • Validate data types: Use only valid JSON data types (string, number, boolean, null, object, array).
  • Remove comments: JSON doesn't support comments, remove them before validation.

Related JSON Tools

Explore our complete suite of JSON processing tools

JSON Formatter

Format and beautify JSON data with proper indentation and syntax highlighting.

JSON Minifier

Compress JSON by removing whitespace for smaller file sizes.

JSON Viewer

Visualize JSON data in an expandable tree structure.