JSON Formatter & Validator
Format, validate, and minify JSON with syntax highlighting.
How It Works
The JSON Formatter parses your JSON input using the browser's native JSON.parse() method to validate its structure. If the JSON is valid, it re-serializes it with your chosen indentation level using JSON.stringify(). Invalid JSON produces a clear error message showing what went wrong.
The syntax highlighting engine walks through the formatted JSON string and wraps each token type (strings, numbers, booleans, null values, and keys) in colored spans. This makes it easy to visually scan and understand your JSON data structure at a glance.
Choose between 2-space, 4-space, or tab indentation for readable output, or select Minify to strip all whitespace for the most compact representation. All processing happens entirely in your browser, so your data remains private.