Hosting a modded server but not wanting players to cheat by editing their configuration files?
ConfigComparator does exactly that. This mod makes a SHA256 digest from both the server side and the client side and compare them. If there is a mismatch, the server will take action.

The configuration file of this mod is located in config/configcomparator-common.toml. It is only used on the server side.

#The duration (in milliseconds) before the server kicks the client for not sending the digest of config files.
#Range: 1000 ~ 3600000
timeout = 30000
#Files to be included for comparison.
#The game directory will be the root directory.
#For example: Putting "config/configcomparator-common.toml" here will compare this file.
files = []
#The action to take if the digests don't match.
#Allowed Values: KICK, WARN_ADMIN, LOG
action = "KICK"

The most important part of the configuration file is files.
They are the paths to the files you want to be compared.

The default action is KICK, which means the player will be kicked if the files don't match.
WARN_ADMIN will warn the OPs in game and LOG will only log to the console.

timeout is just the time before the server kicks the client that refuses to send its digest back.