JSON Editor Online

Online JSON Editor & Validator

A powerful online JSON editor built with Monaco Editor, the same code editor that powers Visual Studio Code. Edit, validate, format, and visualize JSON data directly in your browser with professional-grade features including syntax highlighting, real-time error detection, IntelliSense, and bracket matching. Perfect for developers working with API responses, configuration files, or any JSON data structure.

This free JSON tool offers both a code view for direct editing and an interactive tree view for visualizing complex nested structures. Format messy JSON with one click, minify for production, or validate syntax instantly. All processing happens locally in your browser—your data never leaves your device, ensuring complete privacy and security.

Whether you're debugging API responses, editing configuration files, or learning JSON structure, this editor provides the tools you need. Upload existing JSON files, edit them with VS Code-quality features, and download the results. Recent files are automatically saved to your browser's local storage for quick access.

{
  "user": {
    "id": 12345,
    "name": "John Doe",
    "email": "john@example.com",
    "active": true,
    "roles": ["admin", "editor"],
    "preferences": {
      "theme": "dark",
      "notifications": true
    }
  }
}