i'm trying to balance my modpack by editing every recipe i've tried to edit the fusion crafting but didn't worked this is the file: http://textuploader.com/dcepf

Can we get a full log for this one. Also i recommend using https://jsonlint.com/ if you are editing jsons without a smart editor.

latest.log this is the log file and what the best smart editor please ?

I would recommend https://www.sublimetext.com/ otheriwse any jetbains product such as Intellij IDEA. The actual issue here is in your json, it is not formatted properly.