JSON Formatter / Validator
Format, minify, and validate JSON instantly. Free, private, and runs entirely in your browser.
How to Format and Validate JSON
- Paste or type your JSON into the input area on the left.
- The tool auto-validates as you type and shows a status banner.
- Click "Format / Prettify" to indent your JSON for readability.
- Click "Minify" to compress JSON into a single line.
- Choose your preferred indent size (2 spaces, 4 spaces, or tab).
- Click "Copy" to copy the formatted output to your clipboard.
Frequently Asked Questions
Is my JSON data stored anywhere?
No. All formatting, minifying, and validation happens entirely in your browser. Your data never leaves your device.
What does "Format / Prettify" do?
It parses your JSON and re-serialises it with indentation, making it easy to read. You can choose between 2 spaces, 4 spaces, or tab indentation.
What does "Minify" do?
It removes all unnecessary whitespace and newlines from your JSON, producing the most compact representation. This is useful for reducing payload size in APIs and configuration files.
What JSON stats are shown?
For valid JSON, the tool displays the number of top-level keys (for objects) or items (for arrays), the maximum nesting depth, and the size in bytes.
Can I format large JSON files?
Yes. Since the tool runs entirely in your browser using native JSON parsing, it can handle large files efficiently, limited only by your device's memory.
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