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Add JSON
Paste, type, upload, or drag and drop a .json file into the editor.
Developer Tools
JSON Formatter
Format JSON so it is easier to read and debug.
Paste messy or minified JSON to format, validate, or minify it, with live error feedback — all processed locally in your browser. Working on an API or config file? Pair this with the Password Generator for secrets, or the QR Code Generator to share a quick link.
Your JSON never leaves your browser. Formatting and validation happen entirely on your device.
Paste, type, upload, or drop a .json file.
Format, minify, or validate when you are ready.
How it works
Private JSON formatting in your browser
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Validate locally
Live validation checks the JSON in your browser and shows useful error details when possible.
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Format or minify
Pretty print with 2 or 4 spaces, minify, copy, or download the valid JSON file.
Use cases
When this comes in handy
Debug API responses
Paste a minified API response to make it readable and spot errors.
Clean up config files
Format JSON config files consistently before committing them.
Validate before use
Check that hand-written JSON is valid before pasting it into code.
FAQ
Common questions
Is my JSON uploaded anywhere?
No. JSON formatting, minifying, validation, copying, and downloads all happen in your browser.
Can I format large JSON files?
Yes. The editor uses a lightweight textarea and only parses when needed, so typing stays responsive for typical large JSON files.
Does formatting change my data?
Formatting preserves valid JSON data and only changes whitespace. Minify removes unnecessary whitespace.
Why are Copy and Download disabled?
Copy and Download are enabled only when the editor contains valid JSON, which prevents saving an invalid result by mistake.
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