JSON Validator

Validate JSON syntax and structure with detailed error reporting and line-by-line analysis. Ensure your JSON data is properly formatted and error-free.

Syntax Validation

Error Detection

Structure Check

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JSON Input

Paste your JSON data below to validate its syntax and structure

About JSON Validation

Common JSON Errors

• Missing quotes around keys
• Trailing commas
• Single quotes instead of double quotes
• Unescaped special characters
• Missing closing brackets or braces

JSON Rules

• Keys must be strings in double quotes
• Values can be strings, numbers, booleans, null, objects, or arrays
• No trailing commas allowed
• No comments allowed in standard JSON
• Strings must use double quotes

Related JSON Tools

JSON Minifier

Compress JSON by removing whitespace and formatting

JSON Beautifier

Format and beautify JSON with proper indentation

JSON Converter

Convert JSON to XML, CSV, YAML and other formats

JSON Schema Validator

Validate JSON data against a JSON schema

What is JSON Validation?

JSON validation is the process of checking whether a JSON document conforms to the JSON specification. It verifies syntax correctness, proper structure, and identifies any formatting errors that could cause parsing issues.

Key Features

Syntax Validation

Check JSON syntax against official specifications

Error Reporting

Detailed error messages with line and column numbers

Real-time Validation

Instant feedback as you type or paste JSON

File Upload Support

Upload and validate JSON files directly

Common Use Cases

Validate API responses and requests
Check configuration files before deployment
Debug JSON parsing errors in applications
Verify data integrity in JSON databases

Example

❌ Invalid JSON

{
  "name": "John Doe",
  "age": 30,
  "city": "New York"
  "hobbies": [
    "reading",
    "swimming"
  ]
}

Missing comma after "New York"

✅ Valid JSON

{
  "name": "John Doe",
  "age": 30,
  "city": "New York",
  "hobbies": [
    "reading",
    "swimming"
  ]
}

Properly formatted and valid!

Frequently Asked Questions

What makes JSON invalid?

Common issues include missing commas, unmatched brackets or braces, trailing commas, unquoted keys, single quotes instead of double quotes, and undefined values like functions or comments.

Can this validator handle large JSON files?

Yes, our validator can handle large JSON files efficiently. However, very large files (>10MB) might take longer to process depending on your browser's performance.

Does the validator support JSON5 or JSONC?

This validator strictly follows the JSON specification (RFC 7159). It doesn't support JSON5 extensions like comments or trailing commas, which are not part of standard JSON.

Is my data secure when using this validator?

Yes, all validation happens locally in your browser. Your JSON data is never sent to our servers, ensuring complete privacy and security of your information.