Validate JSON data and find errors with line and column numbers, with real-time syntax checking, formatting, and structure analysis
Developer Tools
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
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
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Frequently Asked Questions
What types of JSON errors can the validator detect?
The validator detects all common JSON syntax errors including missing commas, unmatched brackets, trailing commas, invalid escape sequences, and unexpected tokens. Each error is reported with its exact line and column number so you can locate and fix it quickly.
Does the validator check JSON against a schema?
This tool performs syntax validation to ensure your JSON is well-formed and parseable. It does not validate against JSON Schema or enforce value constraints. For schema-based validation, you would need a dedicated JSON Schema validator.
How does the tree view work?
When your JSON is valid, the tool generates an interactive tree view on the right panel. You can expand or collapse individual nodes by clicking the arrow icons, or use the "Expand All" checkbox to toggle the entire tree. Each node shows its data type with a color-coded badge (string, number, boolean, null, array, or object).
Is my JSON data sent to any server?
No. All validation, formatting, and tree generation happens entirely in your browser using JavaScript. Your JSON data never leaves your device, making this tool safe for use with sensitive data like API keys, credentials, or private configurations.
Can I use the JSON Validator on my phone?
Yes, the JSON Validator is fully responsive and works on all devices including smartphones and tablets. On smaller screens, the editor and results panels stack vertically for comfortable viewing and editing.