JSON Validator Online
Paste your JSON code below to validate it. The tool will check for syntax errors and ensure it's well-formed.
Result
Paste your JSON code below to validate it. The tool will check for syntax errors and ensure it's well-formed.
The JSON Validator instantly checks JSON data for syntax errors, malformed structures, and compliance with JSON specifications. Essential for developers debugging API responses, configuration files, or data imports, the validator provides clear error messages with line numbers when issues are found. It handles complex nested objects, arrays, and all JSON data types while remaining lightweight and responsive.
You can paste JSON directly, upload files, or drag content into the validator for quick verification. Because validation runs client-side, your data stays private and results appear instantly without server round-trips. The validator pairs well with other tools in the suite — validate first, then beautify for readability or minify for production use. Use it to catch syntax errors before deploying configs, verify API response formats, or ensure data integrity in your development workflow. Try pasting malformed JSON to see how detailed the error reporting is.
All validation happens in your browser. No data is sent to our servers, ensuring complete privacy and security.
Instant validation results with detailed error reporting. No waiting, no delays, just immediate feedback.
Precise error messages with line numbers help you quickly identify and fix JSON syntax issues.
Responsive design works perfectly on desktop, tablet, and mobile devices. No installation required.
No — all JSON validation is performed client-side in your browser. We don't store, transmit, or persist your data on our servers. Your JSON content remains completely private and secure.
File size limits depend on your device's memory. For large JSON files (>10MB), consider chunking the data or using a server-based validation workflow. Our tool works best with files under 5MB for optimal performance.
Yes — our JSON validation tool is completely free to use with no signup required. We don't have usage limits, subscriptions, or hidden fees. Use it as much as you need for personal or commercial projects.
Our validator detects all common JSON syntax errors including missing commas, unclosed brackets, invalid quotes, trailing commas, duplicate keys, and malformed data types. It provides precise error messages with line numbers for quick debugging.
For JSON Schema validation, use our dedicated JSON Schema Validator tool. This tool focuses on syntax validation, while the schema validator checks data structure compliance.
JSON Toolset stands out with its comprehensive suite of client-side tools, ensuring your data privacy and lightning-fast processing. No sign-ups, no server-side data storage – just efficient, secure JSON handling right in your browser.