JSON - Validate or Format
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Result
Everything you need to validate and beautify JSON.
Fast, free, and developer-friendly — perfect for debugging REST API responses, validating config files, or preparing JSON documentation.
Read the official docs about JSON on MDN Web Docs.
JSON (JavaScript Object Notation) is a lightweight data format widely used for transferring data between servers and web applications. Even a small syntax error—like a missing comma or mismatched bracket—can break parsers and APIs. Our JSON Validator & Formatter helps ensure your JSON is correct and readable.
A JSON Validator checks whether your JSON is properly structured and free of syntax errors. It attempts to parse the JSON and returns an error with location information if it fails.
Formatting (pretty print) uses the parser to convert JSON back into text with consistent indentation and line breaks for readability.
Yes — this tool is free and requires no registration.
Yes. Very large inputs may be limited by your browser's memory. The tool processes data locally in your browser.
No — processing happens locally in the browser. Nothing is sent to a server by default.
Format / Pretty Print adds spaces and line breaks for readability. Minify removes unnecessary whitespace to create the smallest possible JSON string.
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