9minecraftAPI Mod: What It Is and How to Install It

A library, not a content mod

9minecraftAPI Mod adds no blocks, items, mobs, or world changes of its own. It is a shared API layer: the common code that many multiplatform mods are built on so they can run on either major mod loader from a single codebase. If you install it expecting new gameplay, you will see nothing new — and that is expected.

When you need it

You only need this jar if another mod you are installing lists 9minecraftAPI (or the shared API) as a dependency. In that case, place this jar in your mods folder alongside that mod, matching your Minecraft version and loader. Mods that require the shared API detect it automatically, so no configuration is needed.

What to expect

It is lightweight: no content, no world changes, and no performance cost when idle. Removing it will cause any dependent mod to fail to load, so keep it installed as long as those mods are present.