JSON Formatter & Validator

Format, validate and pretty-print JSON with configurable indentation and optional key sorting.

Developer100% client-sideFree · no sign-up

json-formatter — tool

JSON input

Indentation

Sort keys alphabetically

Formatted JSON

Your input is processed locally in the browser. Nothing is uploaded.

runs 100% client-side · your data never leaves the browser

how_to — json-formatter

How to use the json formatter & validator

1Paste or type your content into the input box — or click Sample to try it with realistic data.
2Adjust the options above the result to control how the output is produced.
3The result updates automatically as you type, then copy or download it when you are happy.

No. Parsing and formatting happen entirely in your browser — nothing ever leaves the page.

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