JSON Formatter & Validator
Format, beautify, validate, and minify JSON instantly. 100% client-side processing—your data never leaves your browser.
Input
Output
How to Use
- Format JSON: Paste your JSON in the input area and click "Format" to beautify it with proper indentation.
- Validate JSON: Invalid JSON will show clear error messages with line and column numbers.
- Minify JSON: Click "Minify" to remove all unnecessary whitespace and reduce file size.
- Copy Output: Click "Copy" to copy the formatted or minified JSON to your clipboard.
- Keyboard Shortcuts: Use Ctrl+Enter (Cmd+Enter on Mac) to format, Ctrl+M to minify, Ctrl+K to clear.
Frequently Asked Questions
Is my data safe?
Absolutely! This tool runs 100% in your browser using JavaScript. Your JSON data never leaves your computer—it's not sent to any server. All processing happens locally, and your data is automatically saved to your browser's localStorage so you can close the tab and come back later.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used to store and exchange data between systems. It's human-readable and widely used in web APIs, configuration files, and data storage. JSON uses a simple syntax with key-value pairs, arrays, and nested objects.
How do I fix JSON errors?
When you paste invalid JSON, this tool will show you exactly where the error is, including the line and column number. Common JSON errors include: missing quotes around keys, trailing commas, unescaped quotes in strings, and mismatched brackets. Check the error message for specific guidance on what's wrong.
Can I use this for large files?
Yes! This tool can handle JSON files up to several megabytes in size without freezing. For very large files (5MB+), processing may take a few seconds. If you're working with extremely large datasets, consider breaking them into smaller chunks.