JSON Formatter & Validator
Paste your JSON below to format, validate, and beautify it. Errors will be highlighted.
About This JSON Formatter
This free online JSON formatter and validator helps developers format, beautify, and validate JSON data instantly. It detects syntax errors and shows clear messages so you can fix your JSON quickly. Everything runs in your browser — your data never leaves your device.
How to Use
- Paste your JSON into the input box.
- Click "Format" to beautify it with proper indentation.
- Click "Minify" to remove all whitespace.
- Use "Copy" to copy the result, or "Clear" to start over.
Features
- Validate JSON and detect syntax errors
- Beautify JSON with 2-space indentation
- Minify JSON into a single line
- Syntax highlighting and error messages
- 100% free, no signup required
- Works offline — data never leaves your browser
Frequently Asked Questions
Is my JSON data safe?
Yes. All formatting and validation happens in your browser. No data is sent to any server.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used to exchange data between servers and web applications. It is easy for humans to read and machines to parse.
Does this tool support large JSON files?
Yes, it can handle large JSON files. Performance depends on your browser and device memory.