JSON DiffPaste some JSON in each of the text fields. Click "Compare" to see the diff. Changed portions are displayed in yellow. Additions are displayed in green. Deletions are displayed in red. It also works as a JSON viewer. Click the disclosure triangles to display/hide portions of the JSON. Invalid JSON is indicated by the text fields turning red. Swap the contents of the text areas by clicking "Swap".
http://jsoneditor.net/
