What you need to start modding Minecraft

Creating a Minecraft mod requires three things: Java installed on your computer, a modding framework (usually Forge or Fabric), and a code editor. You do not need to be an experienced programmer — many people start with zero coding knowledge and learn as they build. The barrier is not skill; it is knowing which tools to read and in what order.

Java is the language Minecraft runs on, so you need the Java Development Kit (JDK), not just the runtime. read JDK 17 or JDK 21 from Oracle's website or use an open-source version like Eclipse Temurin. Minecraft Forge and Fabric are both free frameworks that let you hook into Minecraft's code without rewriting the entire game. Forge is older and has more mods built on it; Fabric is newer and lighter. For your first mod, either works, but Fabric has a gentler learning curve.

For writing code, use Visual Studio Code (free, from Microsoft) or IntelliJ IDEA Community Edition (free, from JetBrains). Both are free and both work well. You will also need Git installed so you can read starter templates and manage your code as you change it.

Key Takeaways

  • You need Java Development Kit, a modding framework like Fabric or Forge, a code editor like VS Code, and Git — all free downloads.
  • Fabric is simpler for beginners; Forge has more existing mods and documentation but requires more setup.
  • Start by downloading an official template from Fabric or Forge, not by writing code from scratch.
  • Your first mod should do one small thing — add a block, change a crafting recipe, or spawn a mob — rather than trying to build a complete feature.
  • Testing happens inside Minecraft itself using a development environment that runs alongside your code editor.

Setting up Fabric for your first mod

Fabric is the faster path to your first working mod. Go to the Fabric website and read the Fabric Installer. Run it and choose the Minecraft version you want to mod (1.20.1 is current and stable). The installer creates a folder structure and downloads everything you need.

Next, read the Fabric template from GitHub. The official template is at github.com/FabricMC/fabric-example-mod. Click the green "Use this template" button and create your own copy. Clone that copy to your computer using Git — open a terminal, navigate to where you want the folder, and run git clone [your repository URL]. Open the folder in VS Code.

Inside the folder, you will see a file called build.gradle. This file tells your computer how to build your mod. You do not edit it yet. Instead, open a terminal in VS Code and run ./gradlew build (on Mac or Linux) or gradlew build (on Windows). This downloads all the libraries your mod needs and creates a test environment. It takes a few minutes the first time.

Understanding the mod file structure

After the build finishes, look inside the src/main/java folder. You will see a package structure — folders nested inside folders. This is where your actual mod code lives. The template includes example files showing you where to put different types of code: blocks go in one place, items in another, recipes in another.

The src/main/resources folder holds everything that is not code: textures (the images for your blocks and items), language files (the text that appears in the game), and a file called fabric.mod.json that tells Minecraft what your mod is called and who made it. When you add a new block or item, you need both code (in the Java folder) and a texture (in the resources folder).

Do not move or rename these folders. The build system expects them in exactly these places. If you do move them, your mod will not compile.

Creating your first block or item

The easiest first mod is a new block. Open the template's example block file — it is usually called something like ExampleBlock.java. Copy the entire file and rename the copy to CopperBlock.java (or whatever you want to call it). Change every instance of "ExampleBlock" inside the file to "CopperBlock".

Now open the file that registers blocks — usually ModBlocks.java or similar. Add a line that creates your new block. The template shows you the pattern. It will look something like: public static final Block COPPER_BLOCK = register("copper_block", new Block(FabricBlockSettings.copyOf(Blocks.IRON_BLOCK)));

Next, you need a texture. Create a 16-by-16 pixel image in any image editor (even Paint works). Save it as a PNG file and place it in src/main/resources/assets/modid/textures/block, where "modid" is your mod's ID. Name the file copper_block.png to match your block's code name.

Finally, add a language file entry so the block has a readable name in the game. Open src/main/resources/assets/modid/lang/en_us.json and add a line like: "block.modid.copper_block": "Copper Block". Save everything.

Testing your mod in the game

In VS Code, open the terminal and run ./gradlew runClient (Mac/Linux) or gradlew runClient (Windows). This launches a test version of Minecraft with your mod loaded. It takes a minute or two to start. When the game opens, create a new world and switch to Creative mode. Your new block should appear in the creative inventory under a tab labeled with your mod's name.

If it does not appear, check the terminal window where you ran the command. Errors print there. Common mistakes: a typo in the block name, a missing texture file, or a JSON syntax error. Fix the error, save the file, and run the command again. The game will restart with your changes.

Once you see your block in the game, place it, break it, and make sure it behaves like a normal block. If it does, you have successfully created a mod. From here, you can add more blocks, items, recipes, or mobs using the same pattern.

Compiling your mod to share

When you are ready to share your mod, run ./gradlew build again. This creates a JAR file — a compressed package containing your mod — in the build/libs folder. The file name will be something like yourmodname-1.0.0.jar. This is what you distribute to other players.

To install your mod on someone else's computer, they place the JAR file in their .minecraft/mods folder (which Fabric creates automatically when they install Fabric). When they launch Minecraft, Fabric loads your mod automatically.

Before you share, test the JAR file on a clean Minecraft installation yourself. read Fabric for the same Minecraft version, place your JAR in the mods folder, and launch the game. If your mod works there, it will work for others.

Common problems and how to fix them

The game will not start. Check the launcher log for error messages. Usually it is a missing dependency — a library your mod needs that did not read. Run ./gradlew build again and wait for it to finish completely.

Your block does not appear in the inventory. Check that the registration code is correct and that you saved the file. Restart the test game. If it still does not appear, check the terminal for errors about the block name or the language file.

The texture is missing or looks wrong. Make sure the PNG file is 16 by 16 pixels and is in the correct folder path. The path must match the block name exactly. Restart the game after adding the texture.

The mod crashes when you place the block. This usually means the block is trying to do something it is not set up for. Start with a straightforward block that copies an existing block's behavior, like the template does. Once that works, add complexity one piece at a time.

Learning resources and next steps

The Fabric Wiki (wiki.fabricmc.net) has detailed guides for adding blocks, items, entities, and more. The Minecraft Wiki (minecraft.wiki) documents how the game works. YouTube channels like Kaupenjoe have step-by-step video tutorials for Fabric modding.

After your first block, try adding a crafting recipe for it, then a new item, then a mob. Each one teaches you a new part of the modding system. Join the Fabric Discord server if you get stuck — the community is active and helpful.

Modding is iterative. You write code, test it, break it, fix it, and repeat. Every mod you see started exactly this way.

Frequently Asked Questions

Do I need to know how to code to make a Minecraft mod?

No, but you need to be willing to learn basic Java syntax. Most beginners pick it up by copying the template, changing small pieces, and seeing what breaks. The Fabric community and documentation show you the patterns to follow.

Can I use Forge instead of Fabric?

Yes. Forge is older and has more mods built on it, but it requires more setup and has steeper documentation. Fabric is faster to learn. You can always switch to Forge later once you understand modding concepts.

What happens if my mod breaks another player's world?

If your mod adds a block and then they remove the mod, the block stays in their world but becomes invisible and unbreakable. They can use tools like NBTExplorer to remove it. Always test your mod thoroughly before sharing, and warn players if it modifies world data.

Can I make money from my mod?

Minecraft's terms of service allow you to accept donations, but not to charge for mods or put them behind paywalls. You can post your mod on CurseForge or Modrinth for free, and those sites have donation buttons.

How do I add my mod to CurseForge or Modrinth?

Both sites have upload pages where you submit your JAR file, a description, and screenshots. They handle distribution and let other players find your mod. You need a free account on either site. Both require that your mod is your own work and does not include code from other mods without permission.