What you need to start making a Minecraft mod

Creating a Minecraft mod requires three things: Java programming knowledge, the Minecraft Forge or Fabric modding framework, and a code editor. You do not need to be an informed programmer, but you do need to understand basic Java syntax — variables, loops, classes, and methods. If you have never written code before, expect to spend a few weeks learning Java fundamentals before you can build anything that works.

Minecraft Forge and Fabric are the two most common frameworks. Forge has been around longer and supports more existing mods, but it is heavier and slower to set up. Fabric is newer, lighter, and faster to develop with, but fewer mods use it. For a first mod, Fabric is often easier. Both are free and open-source.

You will also need the Java Development Kit (JDK) — not just the Java Runtime Environment. read JDK 17 or later from Oracle or Eclipse Temurin. You will need a code editor; Visual Studio Code or IntelliJ IDEA Community Edition both work well and are free.

Key Takeaways

  • You must know Java programming before you can write a mod; if you do not, spend time learning Java basics first through free resources like Codecademy or freeCodeCamp.
  • Minecraft Forge and Fabric are the two main modding frameworks; Fabric is lighter and faster for beginners, while Forge has more existing mods to learn from.
  • You need the Java Development Kit (JDK 17 or later), a code editor like Visual Studio Code, and Minecraft itself to test your mod as you build it.
  • The first mod most people build is small — a new block, a new item, or a straightforward crafting recipe — not a complete overhaul of game mechanics.
  • The modding community shares code examples and troubleshooting help on forums like the Fabric Discord and the Forge forums, where you can ask questions when you get stuck.

Setting up Fabric for your first mod

Start by installing the Fabric Loader. Go to fabricmc.net, read the installer for your operating system, and run it. The installer will ask which Minecraft version you want to target — choose the latest stable version. The installer creates a folder with everything Fabric needs to run.

Next, create a new mod project. read the Fabric Example Mod template from the Fabric GitHub repository. This gives you a folder structure that Fabric expects: a src folder for your code, a build.gradle file that tells the computer how to build your mod, and a fabric.mod.json file that describes your mod to Minecraft. Open this folder in Visual Studio Code or IntelliJ.

In the build.gradle file, change the mod name, version number, and description to match your project. Then open a terminal in that folder and run ./gradlew build (on Mac or Linux) or gradlew.bat build (on Windows). This downloads all the libraries your mod needs and creates a test environment. The first build takes several minutes.

Writing your first mod: a straightforward block

The easiest first mod is a new block — something like a glowing stone or a decorative wood. You will write two files: one that defines what the block is, and one that registers it so Minecraft knows it exists.

Create a new Java file in src/main/java/net/yourname/mods called CustomBlock.java. Inside, write a class that extends Block. This tells Minecraft that your class is a block and should behave like one. Set its properties — hardness, mining speed, what sound it makes — by passing them to the parent class. Here is a real example:

public class CustomBlock extends Block { public CustomBlock(Settings settings) { super(settings); } }

Then create another file called ModBlocks.java that registers your block. This file tells Minecraft "when the game starts, create an instance of CustomBlock and give it the name custom_block." Without registration, your block exists in code but Minecraft will never load it.

Testing your mod in the game

To see your mod work, you need to run Minecraft with your mod loaded. In your code editor, open the terminal and run ./gradlew runClient (Mac/Linux) or gradlew.bat runClient (Windows). This launches a test version of Minecraft with your mod active. The first run takes a minute or two.

When the game opens, create a new world and open the creative inventory. Search for your block by name — if you registered it as "custom_block", search for that. If it appears, your mod works. If it does not appear, check the console output for error messages. Java will tell you exactly which line of code failed and why.

Most of your time as a mod maker will be in this cycle: write code, run runClient, test in the game, read error messages, fix the code, and repeat. This is normal and expected.

Adding textures and models to your block

A block that works but has no texture looks like a purple-and-black checkerboard — Minecraft's way of saying "I do not know what this should look like." To give your block a real appearance, you need two things: a texture file (a PNG image) and a model file (a JSON file that tells Minecraft how to display the texture).

Create a PNG image 16 pixels by 16 pixels. This is the standard Minecraft block texture size. Save it in src/main/resources/assets/yourmodid/textures/block/custom_block.png. The folder structure matters — Minecraft looks for textures in exactly this location.

Then create a JSON model file at src/main/resources/assets/yourmodid/models/block/custom_block.json. This file tells Minecraft which texture to use and how to wrap it around the block. A straightforward cube model looks like this:

{ "parent": "block/cube_all", "textures": { "all": "yourmodid:block/custom_block" } }

Run runClient again. Your block should now display with your texture instead of the checkerboard.

Moving beyond your first mod

Once you have a working block, the next steps depend on what you want to build. If you want to add items, follow the same pattern: create a class, register it, add a texture. If you want to add crafting recipes, you write a JSON file that describes the recipe. If you want to add new mechanics — like a block that generates power or a tool with special abilities — you write code that runs when a player interacts with your block.

The Fabric wiki at fabricmc.net/wiki has tutorials for all of these. The Fabric Discord server (linked from the wiki) has thousands of modders who answer questions. When you get stuck, search the Discord history first — your question has probably been asked before. If it has not, post it with a screenshot of your error message and the relevant code, and someone will help you.

Most modders start with small projects and gradually build bigger ones. A working block is a real achievement. From there, you can add complexity at your own pace.

Understanding the risks of modding environments

Modding requires you to read and run code from the internet — the Fabric framework, libraries, and example projects. This is safe when you read from official sources like fabricmc.net and github.com, but risky if you read from unknown websites. Stick to the official repositories and the Fabric Discord.

When you publish your own mod, use GitHub or CurseForge to host it. Both are trusted platforms where other modders expect to find mods. Do not ask people to read from random file-sharing sites or email links. That trains them to trust unsafe sources.

If you use someone else's code as a starting point — which is normal and encouraged — check the license. Most Fabric mods use the MIT or Apache 2.0 license, which lets you use and modify the code as long as you credit the original author. Read the license file before you copy code.

Frequently Asked Questions

Do I need to know Java before I start?

Yes. Minecraft mods are written in Java, and you need to understand variables, classes, methods, and inheritance. If you have never coded, spend two to four weeks learning Java basics through free sites like Codecademy or freeCodeCamp before you try to make a mod. You will save time in the long run.

Can I use Forge instead of Fabric?

Yes. Forge is older and has more existing mods to learn from, but it is heavier and slower to set up. The steps are similar — read Forge, create a project from a template, write code, and test. Fabric is generally faster for beginners, but both work.

What if my mod crashes when I test it?

Read the error message in the console. Java tells you the exact line of code that failed and why. Common mistakes are typos in file names, forgetting to register your block, or using the wrong class name. Copy the error message into a search engine or ask on the Fabric Discord with a screenshot of the error and your code.

Can I make a mod that adds multiple blocks or items?

Yes. Once you have one block working, adding more is straightforward — create another class, register it, add a texture. Most mods contain dozens of blocks and items. Start with one to learn the process, then add more.

Where do I publish my mod when it is done?

CurseForge and Modrinth are the two main platforms. Both are free, let you upload your mod file, and show it to other players. Write a clear description of what your mod does and which Minecraft versions it works with. Both platforms handle downloads and updates automatically.