HaydenAPI
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
I don't know my version or loader

HaydenAPI
An simple-yet-powerful API library for my own needs when doing Minecraft modding.
Current Features
- Configuration API. Multi-loader compatible configuration system compatible both with Spigot/Paper, Fabric and NeoForge ecosystems.
Planned Features
- Data Components API. Multi-loader compatible attribute and components API to handle item properties modifications to allow data-driven changes for both vanilla, plugin-handled and modded items.
For Users
This API is required for some of my future mods, so mods could be updated much easier each time the game version changes. Put the .jar file into the mods or plugins folder and you're ready to go!
For Developers
This API allows you to use different APIs for multi-loader solutions to handle problematic parts of the plugins or mods such as packets, configs, data attachments and components.
Configuration API
HaydenAPI provides annotation-driven configuration system with easy-to-use annotations.
To specify the configuration class, you should specify @Config before class instantiation.
When the class is marked with the annotation, it will be recognized automatically.
Define the required variables in the class with respective types. To turn the variable into the config entry, you should use @Entry annotation.
You can also mark the variable with @Comment(String comment) to define a comment for it.
If you need a variable that needs to be reloaded each time the user changed it without relaunching the game or server, you should mark the variable with @Reloadable
Example:
@Config
public class Configuration {
@Entry
@Comment("Which message you would like to show each time the player joins?")
public static String welcomeMessage = "Welcome to the server!";
@Entry
@Reloadable
@Comment("Which message you would like to show each time the player joins?")
public static String messageOfTheDay = "Today is a cool day! :)";
}
To use the entry value from the config, just act as it is a default variable, the API will handle the changes.
Example: (Fabric)
public static void onPlayerJoin() {
ServerPlayConnectionEvents.JOIN.register((ServerPlayNetworkHandler player, PacketSender packetSender, MinecraftServer server) -> {
if (player.player != null) {
player.player.sendMessage(Text.of(Configuration.welcomeMessage), false);
}
});
}
Need to mention, that you need to initialize the config file and reload it's values if the user changed them using a text editor.
ConfigurationAPI#createConfig(String path, Class<T> configClass) - creates (if not exists) a configuration file with specified path to place and filename and structure defined in the class with @Config annotation.
ConfigurationAPI#saveConfig(String path, Class<T> configClass) - save and reloads the values of the entries if they're was changed in your code and validates the data within the configuration file structure provided by the class.
ConfigurationAPI#reloadConfig(String path, Class<T> configClass) - reloads the config from the file system and validates the data within the configuration file structure provided by the class.
Example:
public static void init() {
try {
ConfigurationAPI.createConfig(".\\config\\welcomeMessage.json5", Configuration.class);
ConfigurationAPI.reloadConfig(".\\config\\welcomeMessage.json5", Configuration.class);
} catch (ConfigurationException e) {
// Here you can handle the validation errors or any other issues with the configuration file and use default values if you need to.
e.printStackTrace();
}
}
Dependency Setup
In your build.gradle you need to declare HaydenAPI's maven (or CurseMaven, if you wish to) and use modImplementation dependency handler to load the library into your development environment.
repositories {
maven {
name = 'BehindTheScenery Team Maven'
url = 'https://maven.behindthescenery.online/repository/maven-public/'
}
}
dependencies {
modImplementation "dev.denismasterherobrine:haydenapi-${rootProject.modloader}:${rootProject.haydenapi_version}@jar"
}
And in gradle.properties:
modloader = fabric
haydenapi_version = 1.0.2
Note, that you can change the fabric (Fabric/Quilt development environment) to neoforge (NeoForge development environment) or common (Paper/Spigot development environment)) to specify the required version of the HaydenAPI to be used in your development environment.
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as haydenapi-fabric-1.0.4.jar — drop this file into the mods folder
- Download size: 2.2 MB
- Download link checked 28 Sept 2026 — working
These come from our own check of the pack file, not from the source page.