How can you make a client-side mod?

[celest pecan]

A bit silly, but how would you make a client-side only mod? For example, a utility mod that shows text on the screen depending on a chat message received.
Most tutorials outline adding stuff like blocks, entities, etc, And I can't find much good info for client-side mods

I'm a very big beginner to fabric modding, though I have experience in Java and OOP before.
I assume I need to put all my code into the ⁨ModClient.java⁩. But how do I do stuff like listen for certain events (on chat received for example) and print some text or something?

As you can tell I'm very lost, and any help would be appreciated!!

[potent nexus]

i would recommend turning off split sources in the template

ClientReceiveMessageEvents.ALLOW_GAME for the chat event

[celest pecan]

isn't that what i need though? i wouldn't want to mess with the server at all

[potent nexus]

if you have split sources on you have code that explicitly only runs on the server

if you dont you can have your whole mod be set to client side

[celest pecan]

oh cool

a bit confusing ngl

[foggy dome]

the client contains all the server code, so there’s no point having it on

!!sides

[royal prawn]

https://raw.githubusercontent.com/FabricMC/community/main/images/sides.png

[celest pecan]

Hmm I see

So i just set it to client inside fabric.mod.json