JSON hero

JSON Hero detects JSON automatically and highlights it with interactive elements. (example: http://files.myopera.com/xErath/jsonhero/json-good.txt ) The highlighted JSON is navigable using keyboard, links are highlighted, objects and arrays can be collapsed or expanded. You can use the arrow keys, tab and backspace to navigate the tree. All key bindings are displayed in the user interface. Some rudimentary syntax error highlighting is supported, limited by Opera's limited error information. (example: http://files.myopera.com/xErath/jsonhero/json-bad.txt ) There's an interface to easily edit query arguments in the URL. Automatic highlighting can be toggled on and off.