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The Environment namespace contains a set of functions for determining where a script is running. Some of these functions are paired together. For example, a script will return true for one of Environment.IsServer() or Environment.IsClient(), but never for both. Similarly, either Environment.IsLocalGame() or Environment.IsHostedGame() will return true, but not both.

Class Functions

Class Function Name Return Type Description Tags
Environment.IsServer() boolean Returns true if the script is running in a server environment. Note that this can include scripts running in the editor in preview mode (where the editor acts as server for the game) or for the "Play Locally" option in the Main Menu. This will always return false for scripts in a Client Context. None
Environment.IsClient() boolean Returns true if the script is running in a client environment. This includes scripts that are in a Client Context, as well as scripts in a Static Context on a multiplayer preview client or a client playing a hosted game. Note that single-player preview and the "Play Locally" option only execute Static Context scripts once, and that is in a server environment. None
Environment.IsHostedGame() boolean Returns true if running in a published online game, for both clients and servers. None
Environment.IsLocalGame() boolean Returns true if running in a local game on the player's computer. This includes preview mode, as well as the "Play Locally" option in the Main Menu. None
Environment.IsPreview() boolean Returns true if running in preview mode. None
Environment.IsMultiplayerPreview() boolean Returns true if running in multiplayer preview mode. None
Environment.IsSinglePlayerPreview() boolean Returns true if running in single-player preview mode. None


Example using:



Sometimes a script can be written for use on either server or client contexts. In this example, we access the player's user data tables in an abstract way, by creating a function that checks the environment and returns the correct table.

function GetUserData(player)
    if Environment.IsServer() then
        return player.serverUserData

    elseif Environment.IsClient() then
        return player.clientUserData

GetUserData(player)["example"] = true

See also: Player.serverUserData

Example using:


We may want to press a key to display some UI. However, in single-player preview mode, The [Tab] key pauses the simulation. In this example, we assign [Tab] to display the scoreboard. On each action the Environment is checked, to see if it is single-player preview, in which case [Caps Lock] is used instead of [Tab].

function IsTabAction(actionBinding)
    if Environment.IsSinglePlayerPreview() then
        return actionBinding == "ability_extra_18" -- Caps Lock key
        return actionBinding == "ability_extra_19" -- Tab key

function OnBindingPressed(player, action)
    if IsTabAction(action) then


See also: Game.playerJoinedEvent | Player.bindingPressedEvent | Events.Broadcast

Last update: January 5, 2022