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Startup parameters
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Project Zomboid has customisable startup parameters, as either JVM arguments or game arguments. This can be used to override "vmArgs" in the .json file. JVM arguments must end with a --, even if there are no game arguments.
- Create shortcut
- Navigate to the game folder
- Create a shortcut of the executable file (ProjectZomboid32.exe/ProjectZomboid64.exe)
- Add the appropriate Jvm arguments in the "Target:" line
Example:C:\ProjectZomboid64.exe -Xmx1024m -Xms1024m -- -nosteam
- Steam application
- Choose the game shortcut in Steam Library
- Right-click the game
- Select "Properties"
- Hit "Set launch options..."
Game arguments
Client & Server
| Arguments | Description | Example |
|---|---|---|
-nosteam
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Disables Steam integration on client/server. | |
-cachedir=<path>
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Sets the path for the game data cache dir. | -cachedir="C:\Zomboid"
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-modfolders
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Option to control where mods are loaded from. Any of the 3 keywords may be left out and may appear in any order. | -modfolders workshop,steam,mods
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-debug
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Launches the game in debug mode. |
Client
| Arguments | Description | Example |
|---|---|---|
+connect <ip:port>
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Server address to connect, when joining a server using Steam. | +connect 127.0.0.1:16261
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+password <password>
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Server password to connect, when joining a server using Steam. | +password ServersPassword
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-debugtranslation
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Writes possible translation issues to homedir "/Zomboid/translationProblems.txt" | |
-safemode
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Launches the game with reduced resolution and disables some graphical effects to reduce strain on lower-end graphics cards. | |
-nosound
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Disables the game audio |
Server
| Arguments | Description | Example |
|---|---|---|
-adminpassword
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Option to bypasses the enter-a-password prompt when creating a server. | -adminpassword YourPasswdXYZ
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-servername
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You can choose a different servername by using this option when starting the server. | -servername MySecondServer
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-ip <ip>
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Option to handle multiple network cards. Example: | -ip 127.0.0.1
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-port <port>
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Option which overrides the .ini option "DefaultPort". | -port 16261
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-udpport <port>
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Option which overrides the .ini option "UDPPort". | -port 16262
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-steamvac <true/false>
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Option to enable/disable VAC on Steam servers. On the server command-line use -steamvac true/false. In the server's INI file, use SteamVAC=true/false. | |
-steamport1 <port> -steamport2 <port>
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Steam servers require two additional ports to function (I'm guessing they are both UDP ports, but you may need TCP as well). These are in addition to the DefaultPort= setting. These can be specified in two ways: In the server's INI file as SteamPort1= and SteamPort2=. Using command-line options -steamport1 and -steamport2. |
JVM arguments
Client & Server
| Arguments | Description | Example |
|---|---|---|
-Xmx
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Maximum amount of Memory. (1024m=1Gig, 2048m=2Gig, 4096m=4Gig) |
-Xmx1024m
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-Xms
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Initial/Minimum Memory allocation. (1024m=1Gig, 2048m=2Gig, 4096m=4Gig) |
-Xms1024m
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-Dzomboid.steam=<boolean>
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Disables/enables Steam integration on client/server. (0=disabled, 1=enabled) |
-Dzomboid.steam=1
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-Duser.home=<path>
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overwrites the "/Zomboid" homedir to whatever path you want. | -Duser.home=C:\Zomboid
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-Dsoftreset
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option to perform a Soft Reset | |
-Ddebug
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enables debugging |
Server
| Arguments | Description | Example |
|---|---|---|
-Dorg.sqlite.lib.path=<path>
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Windows users: When the Server starts, a temporary sqlite file will be created in "TEMP", however it will not be deleted after stopping the Server. A way to avoid this is by adding a JVM option -Dorg.sqlite.lib.path=natives and put a copy of the .dll called sqlitejdbc.dll in the server's natives/ directory. It will then use that one instead of extracting the .dll from the .jar file every time.
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-Dorg.sqlite.lib.path=natives
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