JSON Validator

Validate and format JSON data instantly with syntax highlighting and error detection.

Request Feature / Support

6,680+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how JSON Validator processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

This JSON Validator tool allows you to quickly validate JSON syntax, format JSON with proper indentation, and identify errors in your JSON data. You can paste JSON directly, upload JSON files, or type JSON manually. The tool provides detailed error messages with line numbers and suggestions for fixing common JSON issues like missing commas, unquoted keys, or trailing commas. The formatted output is syntax-highlighted for better readability.

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How to Use

Paste your JSON code into the textarea OR click 'Upload JSON File' to select a file.
Choose validation options: 'Strict Mode' (requires double quotes) or 'Lenient Mode' (allows single quotes).
Click 'Validate JSON' to check syntax and format.
View results: Valid JSON will be formatted with syntax highlighting; invalid JSON will show detailed error messages.
Use 'Copy Formatted JSON' to copy the validated output to clipboard.

Frequently Asked Questions

Find Quick Answers

What JSON standards does this validator support?

The tool validates against the official JSON specification (RFC 8259). It checks for proper syntax including correct use of quotes, commas, brackets, and data types.

Can I validate large JSON files?

Yes, the tool can handle large JSON files, but for optimal performance we recommend files under 10MB. All processing happens in your browser for privacy.

Does this tool fix JSON errors automatically?

The tool identifies errors with specific messages and line numbers, but doesn't automatically fix them. However, it can format valid JSON with proper indentation and syntax highlighting.

Is my JSON data secure?

Yes, all validation happens entirely in your browser. No data is sent to any server, ensuring complete privacy for your JSON content.

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