KubeJS
What does this mod do?
This mod lets you create scripts in JavaScript language to manage your server, add new blocks and items, change recipes and tags, add custom handlers for quest mods, change worldgen and more!
How to use it?
Run the game with mod installed once. It should generate kubejs folder in your minecraft directory with example scripts. startup scripts only get run once when the game loads. Those are for registering items, setting up configs etc. Server/data scripts are loaded when you join a world, those are better for things like clearlag, displaying custom login messages and world/player related things in general.
Video tutorial for 1.19.2
Can I reload scripts?
Yes, use /reload. Note: Not everything is reloadable. Some things require you to restart game, some only world, some work on fly.
I don't know JavaScript / I need help with this mod!
There's examples and pre-made scripts on KubeJS Wiki.
I have a question / suggestion / bug report!
If wiki didn't have the answer for what you were looking for, you can ask questions, make feature suggestions and report bugs here: KubeJS Support
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- fix: unpredictable tick behaviour for scheduled events (#763)
- fix: restore inventory on disconnect (#962)
- fix / hack: numeric string keys in recipe patterns (#1177)
- fix: smithing template name hints (#974)
- fix: recipe component keys listed in random order (#1035)
- fix: NPE race in TargetedEventHandler.hasListeners during reload (#1027)
- fix: scheduleRepeating never repeating (#863)
- fix: keepIngredient duplicates stackables (#1174)
- fix: index issue in client asset pack injector (thanks to @purplesyringa for pointing this out in #1181)
- Fix invalid fluid lookup for fluid tag ingredients
- Stop bundling Better Advanced Tooltips to fix CTD (use the one from CF / MR instead)
- use TypeWrappers for HolderSets (#1169), this should fix some wrapping issues
- Fix dedicated server crash from block tint function client types (#1159)
- Add
/kubejs browsecommand to open thekubejsdirectory directly from the game - Fix component initialization in item modification
- [port from 1.21] Rework item builders for integration with IItemExtension (#1131)
- [port from 1.21]
globalwrite error message for client and server scripts (#1126) - [port from 1.21] mkdirs automatically when using
JsonIO
- Builders now generate the required model data for item and block-item tinting (#1156)
- Fix
Clientbinding not being available from startup/client scripts (#1152) - Fixed circular initialization between ConsoleJS and ScriptType before script consoles are ready (#1147)
- Fixed creative tab modification not firing correctly (#1149)
- Readd error handling during the recipe event (#1142)
- Fix BlockItemBuilder translation key resolution/duplicate key (#1143)
- Reimplement basic JEI integration. EMI and REI at the time of writing are not released for 26.1 yet and will follow later.
- Fix registry type coercion not working (...because it didn't return a value)
- Hotfix for the release version of NeoForge, sorry to anybody who got a Mixin crash when they tried to open a world!


