Paste raw or minified JSON and instantly format it with clean indentation, or minify it to a single compact line. The formatter validates your JSON as it parses and shows a clear error message if the syntax is invalid — so it doubles as a JSON validator and linter.
Everything runs locally in your browser: your data is never uploaded to a server, making it safe for sensitive payloads. Common uses include debugging API responses, cleaning up config files, and pretty-printing JSON copied from logs.
How do I format JSON online?
Paste your JSON into the input box and click Format. HandyTools indents it with proper spacing and validates the syntax — all in your browser.
Is it safe to paste sensitive JSON?
Yes. All formatting happens locally in your browser; nothing is uploaded to any server.
What is the difference between Format and Minify?
Format adds indentation and line breaks for readability, while Minify strips all whitespace to produce the smallest valid JSON.
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