JSON Formatter & Validator
Paste JSON to format, validate, and minify. Everything runs locally in your browser.
What is JSON Formatter?
JSON (JavaScript Object Notation) is the most common data interchange format on the web. When working with APIs, config files, or debugging, JSON often comes as a single minified line — making it nearly impossible to read.
This JSON formatter takes your compact or messy JSON and outputs clean, properly indented JSON that's easy to read and debug. It also validates your JSON in real-time, immediately highlighting syntax errors with line numbers.
Unlike other online JSON tools, qtoolkit.dev processes everything client-side in your browser. Your data is never sent to any server — making it safe for API keys, tokens, and sensitive payloads.
Features
Format with 2 or 4 space indentation, minify to a single line, sort object keys alphabetically, instant validation with error messages, and stats showing the size difference between input and output.