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JMC

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What JMC is

JMC is a language and compiler for making Minecraft datapacks. Users write Minecraft functions in .jmc files, and JMC compiles those files into a complete datapack. The project presents its syntax as more readable and easier to write than Minecraft functions, and describes the tool as a way to reduce repetitive work with a low learning curve.

Documentation examples show functions, variables, conditional logic, classes, formatted text helpers, and a raycasting helper. The project identifies JMC as a JavaScript-like extension language for datapack creation. It is free and open source under the MIT license, with Linux and Windows listed as platforms.

The README documents installation using Python 3.12 or later with `pip install jmcfunction --pre`. It also documents building an executable on Windows, while the repository includes a Linux build script called `build_linux.sh`. The v1.2.19 release removed its .exe after antivirus software kept flagging it and directs users to the Python version. A v1.2.19-alpha.1 release note says JMC supports Minecraft pack format 48 and above. The README describes JMC as a language and compiler that generates datapacks; it does not list third-party service integrations.

Who it suits

JMC suits Minecraft datapack creators who want to write functions in a more readable extension language and compile them into datapacks. It is relevant to Linux and Windows users comfortable installing with Python 3.12 or later, or building the documented executable.

What it does well

  • Free and open source under the MIT license.
  • Compiles .jmc files into complete Minecraft datapacks.
  • Examples include variables, conditionals, classes, and formatted text.
  • Includes a raycasting helper in its examples.
  • Installation is documented for Python 3.12 and later.

What to know first

  • The removed .exe is not available in the v1.2.19 release.
  • Installation through pip requires Python 3.12 or later.

Getting started

  1. Visit the JMC project website.
  2. Install Python 3.12 or later.
  3. Install JMC with `pip install jmcfunction --pre`.
  4. Alternatively, follow the documented Windows executable build or use the Linux `build_linux.sh` script.
  5. Write Minecraft functions in .jmc files and compile them into a datapack.

Verdict

Pick JMC if you create Minecraft datapacks and want to write functions using its extension language before compiling them into a pack. Look elsewhere if you need a currently available Windows .exe; the v1.2.19 release removed it and directs users to Python.

Questions

Is JMC free?

Yes. JMC is listed as free and open source under the MIT license.

Which operating systems does JMC support?

Linux and Windows are listed as platforms.

How do I install JMC?

The README documents installation with Python 3.12 or later using `pip install jmcfunction --pre`.

Is there a Windows executable?

The README documents building an executable on Windows. The v1.2.19 release removed its .exe because antivirus software kept flagging it and directs users to the Python version.

What Minecraft pack formats does JMC support?

A v1.2.19-alpha.1 release note says JMC supports pack format 48 and above.

Does JMC integrate with third-party services?

The README describes JMC as a language and compiler for generating Minecraft datapacks and does not list third-party service integrations.

Facts from JMC's own pages

Distribution
The repository documents an executable and installation through Python 3.12+ using pip. · github.com, 8 Oct 2026
Features
The project’s examples show functions, variables, conditionals, classes, formatted text helpers, and raycasting. · github.com, 4 Oct 2026
Installation
The README documents installing JMC with Python 3.12+ using pip install jmcfunction --pre. · github.com, 4 Oct 2026
Integrations
The README describes JMC as a language and compiler that generates Minecraft datapacks; it does not list third-party service integrations. · github.com, 4 Oct 2026
Language features
Examples in the project documentation show functions, variables, classes, conditional logic, formatted text, and a raycast helper. · github.com, 8 Oct 2026
License
The project is released under the MIT license. · github.com, 8 Oct 2026
Linux build
The repository includes a Linux build script named build_linux.sh. · github.com, 4 Oct 2026
Minecraft compatibility
A v1.2.19-alpha.1 release note says the project supports pack format 48 and above. · github.com, 4 Oct 2026
Output
JMC compiles JMC files into a complete Minecraft datapack. · jmc.wingedseal.com, 8 Oct 2026
Productivity
The project lists avoiding repetitive tasks, superior syntax, and a low learning curve as reasons to use JMC. · github.com, 8 Oct 2026
Purpose
JMC is a JavaScript-like extension language and compiler for creating Minecraft datapacks. · github.com, 8 Oct 2026
Readable syntax
JMC lets users write Minecraft functions in .jmc files with syntax the project describes as more readable and easier to write. · github.com, 4 Oct 2026
Release limit
The v1.2.19 release says the .exe was removed because antivirus software kept flagging it and directs users to use the Python version. · github.com, 4 Oct 2026
Security
The repository links to a security policy. · github.com, 8 Oct 2026
Syntax
The project describes its syntax as more readable and easier to write than Minecraft functions. · github.com, 8 Oct 2026
Use case
JMC is intended for people creating Minecraft datapacks and can be run from a datapack folder inside a Minecraft world. · github.com, 8 Oct 2026
What it does
JMC is a mcfunction extension language and compiler for making Minecraft datapacks. · github.com, 4 Oct 2026
Windows build
The README documents building the executable on Windows. · github.com, 4 Oct 2026
Windows support
The project documents building its executable on Windows. · github.com, 8 Oct 2026

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