Simple JSON Villager Trades

As simple as it sounds, a small jij-able/standalone library to modify/add merchant trades via datapacks.

For Datapackers

You are able to modify merchant trades through JSON files the data/<namespace>/trade_offers/ directory.
For example:

{
  "__COMMENT": "This adds a ruined portal map to the Cartographer's trades.",

  "profession": "minecraft:cartographer",
  "replace": false,
  "offers": {
    "apprentice": [
      {
        "type": "minecraft:sell_map",
        "price": 5,
        "name_key": "filled_map.ruined_portal",
        "feature_tag": "minecraft:ruined_portal",
        "icon": "target_x",
        "max_uses": 10,
        "experience": 2
      }
    ]
  }
}

For more tutorials and more information on modifying merchant trades, see the wiki.

Compatibility

SJVT uses Minecraft's hardcoded trade map as a base for the datapacks to build on top of, so it should work with most mods, even those who add new villager professions.
You can also export the hardcoded map (including non-native support mods) as a datapack by running the sjvt:build command.

For Mod Developers

You can include the mod using the following repository and dependency in your build.gradle (where [TAG] is the latest version):

repositories {
  maven {
    name = "Modrinth"
    url = "https://api.modrinth.com/maven"
    content {
      includeGroup "maven.modrinth"
    }
  }
}

dependencies {
  modImplementation include("maven.modrinth:sjvt:[TAG]") //To include (jij) in your mod
  modImplementation "maven.modrinth:sjvt:[TAG]" // To require the mod to be installed seperatly
}

Custom Trade Offer Factories

To create a trade offer factory, implement the SerializableTradeOfferFactory interface.
Then register the codec to the TradeOfferFactories.TRADE_OFFER_FACTORY_REGISTRY registry.
You can also use methods and fields in the CodecHelper class to assist in the creation of codecs.

Then see 'For Datapackers'