Best Free JSON Formatter & Validator

Developers deal with messy JSON data every day. QodeCat JSON Formatter helps you clean up, validate, and parse JSON strings instantly. Whether you need to debug an API response or minify a configuration file, this tool handles it directly in your browser.

• Prettify JSON: Convert ugly, minified strings into readable, indented code.
• Minify JSON: Remove whitespace to reduce file size for production.
• Validate JSON: Detect syntax errors with line numbers.
• Visual Highlighting: Color-coded output for better readability.

Why use this tool?

Privacy First

Unlike many other online formatters, we do not send your data to any server. Your JSON is processed locally in your browser using JavaScript. It works even when you are offline.

Error Detection

Paste a broken JSON string, and we will tell you exactly where the error is (e.g., missing comma, unclosed bracket), saving you hours of debugging.

Frequently Asked Questions