Overview
FTB Library (often referred to as FTBLib) is the core foundational mod for the entire Feed The Beast (FTB) ecosystem on Minecraft. It serves as a centralized hub for common code, utilities, and graphical user interface (GUI) frameworks used by popular mods such as FTB Chunks, FTB Quests, FTB Teams, and FTB Ultimine.
While primarily a developer tool, FTB Library introduces several critical user-facing features, including the inventory sidebar system, a powerful in-game NBT editor, and a unified configuration system. In version 26.1.2, the mod has transitioned away from Architectury dependencies and moved its configuration format from SNBT to JSON5 for improved compatibility and performance.
Reference
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