JSON Formatter

Format, validate and minify JSON, with the error line highlighted and a collapsible colour-coded tree view.

JSON input

Unexpected end of JSON input

Viewer

The parsed tree will appear here.

Ad space — always below the tool, never inside it

How to use json formatter

1Paste your JSONPaste any JSON text or API response into the box.

2Format, minify or just browseFormat adds indentation, Minify strips it, or scroll down to browse the collapsible tree view.

3Fix errors as you goIf the JSON is invalid, the exact line and reason are shown below the box.

It uses the position reported by the browser's JSON parser and counts line breaks up to that point, so you can jump straight to the problem.

Yes — click any object or array in the tree view to collapse or expand it, same as a typical JSON viewer.

No — parsing, formatting and the tree view all run entirely in your browser.