That will never be something that Snapchat can make available to its users. If you are looking to view Snapchat message history though, it will give you a detailed text file you can download, unzip ...

To see a snap without opening it, use Airplane Mode: Open Snapchat, wait a few seconds for snaps to load, turn on Airplane Mode, view the snap, then log out and uninstall the app. Reinstall and log in ...