JSON Validator

About This Tool

The JSON Validator is a comprehensive JSON analysis tool that goes beyond simple validation. It provides real-time syntax checking with detailed error locations (line and column numbers), one-click formatting and minification, an interactive collapsible tree view for exploring JSON structure, and live statistics including size, line count, key count, and nesting depth. All processing runs entirely in your browser with zero data sent to any server.

Key Features

• Real-time validation with precise error locations — shows exact line and column numbers for every syntax error
• Syntax highlighting — color-coded strings, numbers, booleans, null values, and brackets for easy reading
• One-click format and minify — pretty-print with 2-space indentation or compress to a single line
• Interactive collapsible tree view — explore JSON structure with expand/collapse controls and type badges
• Click-to-jump error navigation — click any error to instantly jump to the exact position in the editor
• Live statistics — track file size, line count, total keys, and maximum nesting depth at a glance

Quick Preview

Use Cases

• Debug API responses — paste JSON from REST APIs to quickly find malformed data or missing brackets
• Validate configuration files — check JSON config files for syntax errors before deploying to production
• Format and prettify minified JSON — transform compact API output into readable, indented format
• Inspect complex JSON structures — use the tree view to explore deeply nested data without losing context
• Learn JSON syntax — load the built-in sample to see valid JSON structure with highlighted data types