JSON Formatter
Paste messy JSON and get it back clean and indented — or minified to one line — with a plain-English error if something's off.
How it works
Paste your JSON and hit Format. The tool parses it, then re-prints it with two-space indentation so the structure is easy to scan. Minify does the opposite, stripping every space and line break for the smallest possible payload.
The real value is validation. If the JSON is broken — a trailing comma, a missing quote, an unclosed bracket — parsing fails and you get the exact error instead of a silent blank, so you know where to look.
Everything runs locally, which matters when the JSON is an API response or config full of keys and tokens. Nothing you paste is sent anywhere.
Frequently asked questions
What does formatting JSON actually do?
It re-indents the JSON so nested objects and arrays line up and become readable. The data is identical — only the whitespace changes.
Why would I minify JSON?
Minified JSON removes all unnecessary whitespace, making the file smaller and faster to send over a network. It's common for production APIs and config bundles.
How do I know why my JSON is invalid?
When parsing fails, the tool shows the error message from the JSON parser, which usually points to the position or token that broke it — a missing comma, quote, or bracket.