Format, validate, and beautify JSON with syntax highlighting and error detection.
Our JSON Formatter & Validator is a powerful online tool designed for developers and data analysts who work with JSON (JavaScript Object Notation) data. This tool takes messy, minified, or incorrectly formatted JSON and transforms it into a clean, readable format with proper indentation and syntax highlighting. It also validates your JSON to ensure it's correctly structured, helping you catch errors before they cause problems in your applications.
Instantly detect and highlight JSON syntax errors
Auto-format with proper indentation and spacing
All validation happens offline in your browser
No internet connection required after page load
Your JSON data is processed entirely within your browser using JavaScript. Nothing is ever uploaded to a server or stored in a database. This means your sensitive API responses, configuration files, and data structures remain completely private. The tool works even without an internet connection, making it perfect for working with confidential or proprietary data.
This JSON formatter is essential for anyone working with JSON data, from beginners learning web development to experienced engineers debugging complex APIs.
Debug API responses and configure application settings
Clean and validate JSON datasets for analysis
Learn JSON syntax and validate homework assignments
JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging data. Formatting makes it human-readable by adding proper indentation and line breaks, making it easier to understand and debug.
Yes! Since all processing happens in your browser, the only limit is your device's memory. Most modern browsers can easily handle JSON files several megabytes in size.
No, the tool validates and highlights errors but doesn't auto-fix them. This is intentional - understanding why JSON is invalid helps you learn and prevents accidental data corruption.