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Attention: We always welcome contributors to the project. Before adding your contribution, please carefully read our Code of Conduct.

Current features

Logging in
Combat
Friends list
Teleportation
Gacha system
Co-op partially works
Spawning monsters via console
Inventory features (receiving items/characters, upgrading items/characters, etc)

Quick setup guide

Note: For support please join our Discord.

Requirements

Java SE - 17 or higher

Note: If you just want to run it, then jre only is fine.
MongoDB (recommended 4.0+)
Proxy Daemon: mitmproxy (mitmdump, recommended), Fiddler Classic, etc.

Running

Note: If you updated from an older version, delete config.json to regenerate it.

Get grasscutter.jar
- Download from releases or actions or build the server by yourself.
Create a resources folder in the directory where grasscutter.jar is located and move your BinOutput, ExcelBinOutput, Readables, Scripts, Subtitle, TextMap folders there (Check the wiki for more details how to get those.)
Run Grasscutter with java -jar grasscutter.jar. Make sure mongodb service is running as well.

Connecting with the client

½. Create an account in the server console using this command.

Redirect traffic: (choose one only)
- mitmdump: mitmdump -s proxy.py -k
  - Trust CA certificate:
    - The CA certificate is usually stored in %USERPROFILE%\.mitmproxy, double click mitmproxy-ca-cert.cer to install or...
    - Via command line (needs administration privileges)
      certutil -addstore root %USERPROFILE%\.mitmproxy\mitmproxy-ca-cert.cer
- Fiddler Classic: Run Fiddler Classic, turn on Decrypt HTTPS traffic in (Tools -> Options -> HTTPS) and change the default port in (Tools -> Options -> Connections) to anything other than 8888, load this script (copy and paste the script in the FiddlerScript tab) and click the Save Script button.
- Hosts file
Set network proxy to 127.0.0.1:8080 or the proxy port you specified.

For mitmproxy: After setting up the network proxy and installing the certificate, check http://mitm.it/ if traffic is passing through mitmproxy.

You can also use start.cmd to start servers and proxy daemons automatically, but you have to set up JAVA_HOME environment and configure the start_config.cmd file.

Building

Grasscutter uses Gradle to handle dependencies & building.

Requirements:

Java SE Development Kits - 17 or higher
Git

Windows

git clone https://github.com/Grasscutters/Grasscutter.git
cd Grasscutter
.\gradlew.bat # Setting up environments
.\gradlew jar # Compile

Linux

git clone https://github.com/Grasscutters/Grasscutter.git
cd Grasscutter
chmod +x gradlew
./gradlew jar # Compile

You can find the output jar in the root of the project folder.

Commands have moved to the wiki!

Quick Troubleshooting

If compiling wasn't successful, please check your JDK installation (Make sure its JDK 17 or higher and validated JDK's bin PATH variable).
My client doesn't connect, doesn't login, 4206, etc... - Mostly your proxy daemon setup is the issue. If you're using Fiddler, change the default port to anything other than 8888.
Startup sequence: MongoDB > Grasscutter > Proxy Daemon (mitmdump, fiddler, etc.) > Game

7u4 / Grasscutter