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A JSON beautifier takes compact or minified JSON and rewrites it with consistent indentation, line breaks, and spacing so a human can actually read it. It is the first thing most backend developers reach for when an API returns a one-line blob and they need to spot a missing field or a misplaced bracket. This tool beautifies JSON locally in your browser so sensitive payloads never leave your machine, and it preserves key order while normalizing whitespace.
Turn single-line webhook payloads or curl output into indented JSON so you can follow the nesting at a glance.
Beautify fixtures and mocks before committing so diffs stay line-by-line instead of one long string.
Paste JSON log lines from stdout or a log shipper and immediately see which fields the service emitted.
Copy a response from the Network tab and beautify it to compare against what the UI is rendering.
No. Only whitespace is added. The parsed object is identical to the input, so byte-equality is lost but semantic equality is preserved.
Two spaces by default, which matches the convention used by most JavaScript and Python style guides and by VS Code out of the box.
No. Beautifying preserves the original key order. If you want alphabetical order, use the JSON sort tool instead.
The browser is the limit. Files up to a few megabytes beautify instantly; tens of megabytes may freeze the tab because everything runs on the main thread.
It will report the first syntax error with a line and column, but it will not guess at fixes. Repair the source and paste again.