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It's a library for creating server side content, that work for player's without mods or (required) resource packs! You can create blocks, items and entities, that not only will work fully server side (and singleplayer), but also are still real custom ones, allowing for better integration with data packs and other mods (servers still see it as mymod:custom and not minecraft:player_head, unlike bukkit/spigot ones, that only emulate them).

This library also works correctly with other, non-polymer mods and PolyMc!

For players:

This library/mod includes few small utilities that can be useful for playing on servers using Polymer.

Few things it does on the client:

For server owners/mod pack makers:

Any mod using this library shouldn't be required on the client side! However, as stated above, there are few small quality of life things added with it. So you might want to recommend it or include with your mod pack.

If you have a server and polymer based mods you are using include a resource pack, you might want to install "bundled/packed/all" version of polymer contains AutoHost module, allowing you to set up automatic building and sending of packs to clients. See this page to learn about the setup.

If you use 1.18.x or older, use this instead:

For mod developers:

All information about usage can be found at!

What this library/mod doesn't do

This mod doesn't convert existing mods to server side ones. While it's possible to do so with manual coding, for that you might want to use PolyMc as long as you don't need to use regular mods on the client (for example with a modpack).


  • /polymer - Display about
  • /polymer creative - Opens list of Polymer/Server-Side creative tabs (Available to anyone with creative)
  • /polymer generate-pack - Generates polymer resourcepack as <server/client directory>/
  • /polymer stats - Shows server side statistics
  • /polymer effects - Shows server side status effects
  • /polymer client-item - Displays client side nbt of held item
  • /polymer client-item get - Gives player client side copy of held item
  • /polymer export-registry - Exports registry information (debug command)