What is Architectury API?

It is a Minecraft mod that makes it easier to develop cross-platform mods for both Forge and Fabric loaders.

What does Architectury API do?

This mod provides a common API (Application Programming Interface) that both Forge & Fabric can use. Through this Minecraft modding developers can write code that works on both loaders so that they won't have to create a separate version for each loader.

How to fix "Architectury API is not installed"?

Sometimes a problem may occur when trying to make a mod pack. When launching Minecraft you might see this error telling you that "Architectury API is not installed." This error may occur even if you already have it installed. In that case, you need to re-download this mod for the Fabric loader. Sometimes players accidentally download the Forge one which causes this error.