JSON Validator & Syntax Checker

Validate your JSON data instantly with our free online JSON validator. Detect syntax errors, check format compliance, and ensure your JSON is properly structured for APIs and applications.

Formatter Features

Real-time JSON validation with visual feedback
Format JSON with custom indentation levels
Minify JSON to reduce file size
Copy to clipboard and download functionality
Premium: File upload for direct JSON processing

How to Validate JSON

1

Input JSON

Paste your JSON data into the validator input field.

2

Check Syntax

Our validator automatically checks for syntax errors.

3

Fix Errors

View detailed error messages and fix any issues found.

Why Validate JSON?

JSON validation is crucial for ensuring data integrity and preventing errors in applications. Validating your JSON helps you:

  • Prevent runtime errors in applications
  • Ensure API requests and responses are properly formatted
  • Debug configuration files and data structures
  • Maintain data quality and consistency

Common JSON Validation Errors

Syntax Errors

  • • Missing commas between elements
  • • Unmatched brackets or braces
  • • Invalid escape sequences
  • • Trailing commas

Format Issues

  • • Single quotes instead of double quotes
  • • Unquoted property names
  • • Invalid number formats
  • • Incorrect boolean values

Features

Real-time Validation

Instant feedback as you type or paste JSON data.

Detailed Error Messages

Clear descriptions of errors with line and column numbers.

Error Highlighting

Visual highlighting of problematic areas in your JSON.

Format on Success

Automatically format valid JSON for better readability.

✅ Best Practices for Valid JSON:

  • • Always use double quotes for strings and property names
  • • Ensure all brackets and braces are properly matched
  • • Remove trailing commas after the last element
  • • Use proper escape sequences for special characters
  • • Validate JSON before using it in production