JSON formatting means turning a compact or messy block of JSON into clean, indented, readable text — and catching syntax errors while you do it. To format JSON online, paste it into a JSON formatter, click Format, and copy the pretty-printed result. This guide shows you how to beautify, minify and validate JSON, what common errors mean, and how to do it privately without uploading your data to a server.
Copy the raw or minified JSON from your API response, config file or log and paste it into the formatter.
Choose 2-space, 4-space or tab indentation and the tool pretty-prints it instantly.
If the JSON is invalid, the tool shows the exact line and column so you can correct the typo.
Copy the clean JSON, download it as a .json file, or click Minify to compact it for production.
What does formatting (beautifying) JSON do?
Beautifying JSON adds line breaks and consistent indentation so nested objects and arrays are easy to read. It does not change the data — only the whitespace. The opposite, minifying, removes all unnecessary whitespace to make the payload smaller for network transfer. Use the JSON Formatter to switch between the two instantly.
How do I fix “Unexpected token” JSON errors?
The most common JSON errors are a trailing comma, a missing comma, single quotes instead of double quotes, or an unquoted key. A good validator points to the exact line and column of the problem. Check that every string uses double quotes, every key is quoted, and there is no comma after the last item in an object or array.
Is it safe to paste sensitive JSON?
It depends on the tool. Many online formatters upload your JSON to a server. This formatter runs entirely in your browser, so your data — including tokens, API responses and config — never leaves your device. For other developer needs, see the full developer tools collection.
Tip: Use 2-space indentation for files you commit to git — it keeps diffs small and matches most linter defaults.
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Paste messy JSON and get clean, validated output in one click — free, in your browser.
Open the JSON Formatter →Frequently Asked Questions
How do I format JSON?
Paste it into a JSON formatter and click Format. It adds indentation and line breaks so the structure is readable, and flags any syntax errors.
What is the difference between beautify and minify?
Beautify adds whitespace to make JSON readable; minify removes whitespace to make it smaller. Both keep the data identical.
Why is my JSON invalid?
Usually a trailing comma, a missing comma, single quotes, or an unquoted key. The validator shows the line and column to fix.
Is my JSON uploaded anywhere?
No — this tool formats JSON in your browser, so nothing is sent to a server or stored.