Install JDK 21

To develop mods for Minecraft 1.21.8, you will need JDK 21.

If you need help installing Java, you can refer to the various Java installation guides in the player guides section.

Set Up Your IDE

To start developing mods with Fabric, you will need to set up a development environment using IntelliJ IDEA (recommended), or alternatively Visual Studio Code.

IntelliJ IDEA

Visual Studio Code