JSON Formatter & Validator
Format, validate, minify, and explore JSON data with syntax highlighting, tree view, and error detection.
Input JSON
Formatted output will appear here
Related Articles
Learn more about this topic
Related Tools
You might also find these useful
Everything you need to know
Free Online JSON Formatter
Paste any raw, minified, or messy JSON and instantly get a clean, readable version. Choose between 2-space or 4-space indentation to match your project's coding style. The formatter handles deeply nested objects and large arrays effortlessly.
JSON Validator with Error Messages
Invalid JSON? The tool pinpoints the exact syntax error — missing commas, unclosed brackets, incorrect quotes, trailing commas — so you can fix problems instantly without hunting through thousands of lines.
Minify JSON for Production
Switch to Minified view to strip all whitespace, yielding the smallest possible output. Perfect for API responses, configuration files, and reducing payload size. The tool shows both formatted and minified sizes so you can compare.
Interactive Tree View
Explore complex JSON structures with the collapsible tree view. Each node is color-coded by type — green for strings, blue for numbers, amber for booleans, and gray for nulls. Expand and collapse branches to navigate large datasets easily.
Privacy & Security
JSON processing happens in your browser, making it suitable for working with sensitive data like API keys, database records, and internal configurations.
Related Developer Tools
Encode strings for API use with the Base64 Encoder, test patterns with the Regex Tester, or compare JSON documents with the Diff Checker.