how do i get stack resizer plugin to work? i have edited to .json to file to how i would like it and restarted the server but it doesnt work?

Send your config 

There are two configs. One is in \oxide\config\ and that's where the category stack sizes are set (check out the note on the documentation). The main config is in the \oxide\data folder and has the values for each of the items.

Most times you won't need to restart the whole server to reload a mod. Just o.reload StackSizeController