JSON Formatter
Beautify or minify JSON in your browser with clear, exact error messages.
What does a JSON formatter do?
A JSON formatter takes raw, often single-line JSON and re-indents it so the structure is easy to read. Beautify adds two-space indentation and line breaks; Minify strips every space and newline to give you the smallest valid payload for transport.
Formatting is also validation
Because this tool uses the browser's native JSON.parse, anything it can pretty-print is
guaranteed to be valid JSON. If the input is malformed, you get the engine's exact error message —
the same one your application would throw — so you can fix trailing commas, unquoted keys or stray
characters fast.
How to use the JSON Formatter
- Paste your JSON. Drop raw or minified JSON into the input box.
- Click Beautify. See it re-indented with two spaces per level.
- Or click Minify. Collapse it to a single compact line for transport.
- Copy the result. Use the Copy button to grab the formatted output.
Frequently asked questions
Is my JSON uploaded anywhere?
No. Formatting happens entirely in your browser with the native JSON parser; nothing is sent to a server.
What indentation does Beautify use?
Two spaces per nesting level, the most common convention for readable JSON.
Why does it reject my JSON?
Common causes are trailing commas, single quotes, unquoted keys or comments — none of which are valid JSON. The error message points to the position.
Does minifying change my data?
No. Minify only removes insignificant whitespace; the values, keys and structure are identical.