Home : File Types : JEM File

.JEM File Extension

File TypeJSON Entity Model File

2.0 (1 Vote)
CategoryGame Files

What is a JEM file?

A JEM file contains entity model information used to alter models in Minecraft with the OptiFine mod tool installed. It stores information about the model in JSON format, which may include the path to a .PNG image that textures the model and information about various parts of the model.

More Information

Screenshot of a .jem file in Microsoft Notepad

JEM file open in Microsoft Notepad

You will most likely only encounter a JEM file if you are looking to alter the appearance of entities in Minecraft with the Optifine optimization mod installed. Some entities that Minecraft users modify include cows, creepers, dragons, chickens, books, and chests.

If you are looking to override an entity model, you can place the JEM file in the following directory in the resource pack:


Once the JEM file is placed in the directory, the model will appear in Minecraft as long as the OptiFine optimization mod is installed.

How do I open a JEM file?

You can open and edit JEM files with various model editors, such as Blockbench and Cubik Studio. These tools allow you to visualize the model while you edit JEM files.

Since JEM files are saved in plain text in JSON format, you can also open and edit the files with text editors. Keep in mind that you will not be able to view the models when editing them.

Open over 300 file formats with File Viewer Plus.
Programs that open JEM files
Updated 7/6/2020

About JEM Files

Our goal is to help you understand what a file with a *.jem suffix is and how to open it.

The JSON Entity Model file type, file format description, and Mac, Windows, and Linux programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

If you would like to suggest any additions or updates to this page, please let us know.