A free app for Chrome, by tulios.
JSON Viewer allows you to view, format, and print your JSON and JSONP files quickly.
To use this plugin, first install it, then open your JSON file in Chrome. You will see an icon in the address bar. Click on it and select either "Print Current Page" or "Print Page" to print your JSON file. If you want to the file to get printed, you can also do that from the menu.
This tool also provides you with an option to format your file. You can choose from the built-in themes or create your own.