JSON Formatter & Validator

Pretty-print, minify and validate JSON with syntax highlighting. Free, fast, and your files never leave your device.

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How to use the JSON Formatter

      
    
        
  1. Paste your JSON into the input box, or click "Upload file" to load a .json file.
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  2. Choose 2 or 4 space indentation, and optionally sort keys alphabetically.
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  3. Click "Format" to pretty-print, or "Minify" to compress to a single line.
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  4. Click "Validate" to check syntax without changing the output; errors show the exact line and column.
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  5. Copy the result or download it as a .json file.
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Why use ZillaKit's JSON Formatter?

      
Working with JSON should not require pasting sensitive data into a stranger's server. ZillaKit's JSON formatter runs entirely in your browser using native JavaScript — nothing you paste or upload is ever transmitted anywhere. It is fast even on large payloads, gives you precise error reporting so you can fix malformed JSON in seconds, and supports both pretty-printing and minifying. There is no signup, no watermark, and a generous free daily usage tier for occasional and heavy users alike. Whether you are debugging an API response, cleaning up a config file, or preparing a compact payload for production, this tool handles it instantly and privately, right in your tab.

      
FAQ

      
Is my JSON data uploaded anywhere?

      
No. All formatting, validation and minifying happens locally in your browser using JavaScript. Your data never leaves your device.

      
How does error reporting work?

      
If your JSON is invalid, the tool parses the error position and reports the exact line and column number so you can locate and fix the problem quickly.

      
What is the difference between formatting and minifying?

      
Formatting (pretty-printing) adds indentation and line breaks for readability. Minifying removes all unnecessary whitespace to produce the smallest possible output.

      
Is there a file size limit?

      
The tool comfortably handles JSON files well over 1MB since everything runs locally without network transfer limits.

      
Can I sort object keys?

      
Yes, enable "Sort keys" before formatting to alphabetically order keys at every level of the JSON tree.