In Minecraft there is a function for entering cheat codes that allow you to cheat without installing additional programs, such as for example TooManyItems. Codes for Mayncraft can not be entered in every game world, but only in that where the cheat codes support was enabled – so if you did not include this option …
Download Cheat codes for Minecraft 1.12.2/1.11.2/1.10.2/1.9/1.8