JSON Formatter
Paste messy JSON and get clean, indented output — or minify it back down.
JSON is easy for machines to read but painful for people once it arrives as one long line with no spacing. This formatter takes raw JSON and rewrites it with consistent indentation so you can actually see the structure — objects, arrays and the values inside them. It also works in reverse, stripping every optional space to produce the smallest possible string for an API request or config file. Everything happens in your browser; the text you paste is never sent anywhere.
Beautify or minify
Paste your data into the top box and press Beautify JSON to expand it with four-space indentation, ready to read or drop into documentation. Press Minify to collapse it back to a single compact line — useful when you are pasting into an environment variable, a URL, or anywhere byte count matters. The result panel also reports the total key count and how deeply the structure nests, which is a quick way to gauge how large a payload really is.
Reading the validation feedback
If the text isn't valid JSON, the tool won't guess — it shows the parser's own error message at the top of the output so you can jump to the problem. The usual culprits are a trailing comma after the last item in an object or array, single quotes where JSON requires double quotes, unquoted keys, or a missing closing bracket. JSON also has no comments, so a stray // line will fail. Fix the flagged spot and format again.
Why formatting happens on your device
API responses and config files often contain tokens, internal IDs, customer records or other things you would rather not paste into a random website. This tool uses the browser's built-in JSON parser, so your data stays in the page and is discarded the moment you close the tab. That makes it safe to use with production payloads without worrying about where the text ends up.
Frequently Asked Questions
Is my JSON sent to a server?
No. Formatting, minifying and validation all run in your browser using its native JSON engine. The data never leaves your device and is cleared when you close the tab.
What does the error message mean when my JSON is invalid?
It is the exact reason the browser could not parse the text — for example an unexpected character or an unterminated string. Common causes are trailing commas, single instead of double quotes, unquoted keys, and missing brackets.
What is the difference between beautify and minify?
Beautify adds line breaks and indentation so the structure is easy to read. Minify removes all optional whitespace to produce the smallest valid string, which is what you want for transmission or storage.
Does formatting change my data?
No. Only the spacing changes. Keys, values, order within objects and array contents are all preserved exactly — the output represents the same data as the input.