About

What is JSON Checker?

JSON Checker is a free, open-source online tool designed to help developers and data analysts check, view, format, validate, and explore JSON data with ease. The tool works entirely in your browser - no data is ever sent to any server.

Features

  • Interactive Tree View: Explore JSON data with collapsible nodes and syntax highlighting
  • Format & Minify: Beautify JSON with proper indentation or compress it for production
  • Validation: Instantly check if your JSON is valid with detailed error messages
  • Search: Find keys and values quickly with real-time search and highlighting
  • JSONPath: Click any node to see its JSONPath and copy it to clipboard
  • Offline Support: Works without an internet connection after initial load
  • Local Storage: Your JSON is automatically saved and restored between sessions
  • File Support: Upload JSON files or download your formatted JSON

Privacy

Your data never leaves your browser. All processing happens locally on your device. We don't collect, store, or transmit any of your JSON data. Read our Privacy Policy for more details.

Technology

Built with vanilla JavaScript and custom CSS. No heavy frameworks or external dependencies - just fast, lightweight code that runs efficiently in any modern browser.

Keyboard Shortcuts

Ctrl + F
Focus search box
Esc
Clear search

Contact

Have suggestions or found a bug? We'd love to hear from you. Please open an issue on our GitHub repository.