i trying to add more items to levels and enchantments. but when the mod load the config on minecraft, config file are restore previous config.

Closing this, due to no activity.
Additionally a fix was pushed in df75d50 that should fix this error. (not yet build and released)

if the config keeps resetting, there is a problem with the format of the file
you can test your file (before loading the game) for a proper format here https://jsonlint.com/

i use the tool for the format. keeps on same trouble

Can you send me the config? The way you want it to be, before starting the game.
Will have a look over it and try it myself.

Just had someone report a similar issue, do you mean

"bonus_item_more_levels" : [
    {
        "item" : "..."
    },
    {
        "item" : "..."
    }
]

resets back to

"bonus_item_more_levels" : {
    "item" : "..."
}

when the config loads?