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Mods (short for modifications) change Minecraft's game content in some way, such as to make minor adjustments to the game's mechanics or implement entirely new features.
Most mods add content to the game to alter gameplay, change the creative feel, or give the player more options in how they interact with the Minecraft world. Some mods may be bigger expansions, while others add more settings and options to optimize speed, graphics, or gameplay of the game. Server mods or plugins mainly give server admins more options and ease of use, and most mods for single-player have a server version that allows or optimizes the mod in multiplayer.
When the base game is updated, the creator of a mod must update the mod accordingly, otherwise the mod may no longer work.
Types of mods
Client mods are direct modifications of the Minecraft game files. They are not custom clients, as they require modification of the client.jar file. These require mod loaders such as Minecraft Forge or Fabric.
Because the Minecraft server software ignores custom content from the client side, most of the client mods which add new content to the game do not work in multiplayer unless a modification has also been installed on the server. Some authors of client mods have made server versions of their mods available, and others have not. A few of the Loader/API-type client mods and many of the functional client mods (e.g. OptiFine or TooManyItems) have effect in multiplayer straight away, without any modification on server side.
Server mods are modifications to the official Minecraft server software. They are commonly designed to make the administration of servers easier by implementing tiered privileges for commands (such as kicking, banning, etc.). They are frequently implemented as "wrappers" which do not modify the main server .jar file, instead of monitoring its output and sending commands to it.
Mod packs are collections of mods that have been put together and configured so that they all work together. Mod packs are often centered around a general theme like tech, quests, or magic. Mod packs often have either custom launchers or installers that make installing and running the mod pack easy. Some popular mod packs include Feed The Beast, Tekkit, RLCraft, and Hexxit.
Many mod packs can be found on custom launchers, which make it easy to install and launch various mod packs. In addition to making it easy to install mod pack clients, certain launchers can also download server mod packs.
If Minecraft crashes, a modified game is flagged in the crash report.
The crash report text includes one of these lines near the bottom:
Is Modded: Probably not. Jar signature remains and client brand is untouched Is Modded: Very likely; Jar signature invalidated Is Modded: Definitely: client brand changed to (present loader, such as "fml,forge", "modloader", or "fabric") Is Modded: Unknown (can't tell)
A shortened example crash report is given below:
---- Minecraft Crash Report ---- // Uh... Did I do that? Time: 1/1/17 12:00 AM Description: Manually triggered debug crash A detailed walkthrough of the error, its code path, and all known details is as follows: --------------------------------------------------------------------------------------- -- System Details -- Details: Minecraft Version: 1.12 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_131, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 524288000 bytes (500 MB) / 536870912 bytes (512 MB) up to 1073741824 bytes (1024 MB) JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -XX:+DisableExplicitGC IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 Launched Version: 1.12 LWJGL: 2.9.4 OpenGL: AMD Radeon (TM) R9 999 GL version 9.9.99999 Compatibility Profile Context 99.99.999.999, ATI Technologies Inc. GL Caps: Using GL 1.3 multitexturing. Using GL 1.3 texture combiners. Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported. Shaders are available because OpenGL 2.1 is supported. VBOs are available because OpenGL 1.5 is supported. Using VBOs: No '''Is Modded: Probably not. Jar signature remains and client brand is untouched.''' Type: Client (map_client.txt) Resource Packs: Current Language: English (US) Profiler Position: N/A (disabled) CPU: 9x Intel(R) Core(TM) i9-9999Z CPU @ 9.99GHz
The code that checks for mods is fairly simple, and it's not always correct; it may say 'probably not' even with mods installed. However, it's very difficult to get the 'very likely' message if you haven't modified your Minecraft .jar file somehow, so that's essentially a 'yes'. There's also a 'definitely' message, seen when a Bukkit server crashes and under other similar circumstances, like when the Minecraft Forge API is installed.
'Probably not' appears when the client/server brand appears to the in-game check to be unaltered (often termed 'vanilla') and the
META-INF folder is still there. 'Very likely' appears when the
META-INF folder is not present but the client/server brand seems to be vanilla. 'Definitely' plus the client name appears when the client is not vanilla:
Is Modded: Definitely: Client brand changed to 'fml,forge'
- Add-ons, a feature in Bedrock Edition that allows modders to more easily add content to the game.
- Programs and editors/Modding showcases tools for installing and making mods.