Environment Variables

Every game server starts with a set of environment variables that describe where it runs and which ports it listens on. GameFlow injects them automatically, and you can add your own when you create a game.

Looking for the launch payload?

Per-match data like the match id and team roster is not an environment variable. See Launch Payload.

Built-in variables

Variable	Description	Example
GAMEFLOW_REGION	Region the server is running in.	us-east
GAMEFLOW_DEFAULT_PORT	Primary port the server listens on.	7777
GAMEFLOW_{NAME}_PORT	One per additional port. {NAME} is the port's label, uppercased, with spaces replaced by underscores.	9090

All values are strings.

Additional ports

If you configure additional ports on your game, each one gets its own variable. A game with a primary port and two additional ports labeled "voice chat" and "debug" receives:

Variable	Value
GAMEFLOW_DEFAULT_PORT	7777
GAMEFLOW_VOICE_CHAT_PORT	9090
GAMEFLOW_DEBUG_PORT	9091

Reading variables

Use your language's standard environment API. No SDK call needed.

Unity (C#)

var region = Environment.GetEnvironmentVariable("GAMEFLOW_REGION");
var port = int.Parse(Environment.GetEnvironmentVariable("GAMEFLOW_DEFAULT_PORT"));
var voicePort = int.Parse(Environment.GetEnvironmentVariable("GAMEFLOW_VOICE_CHAT_PORT"));

Unreal (C++)

FString Region = FPlatformMisc::GetEnvironmentVariable(TEXT("GAMEFLOW_REGION"));
int32 Port = FCString::Atoi(*FPlatformMisc::GetEnvironmentVariable(TEXT("GAMEFLOW_DEFAULT_PORT")));
int32 VoicePort = FCString::Atoi(*FPlatformMisc::GetEnvironmentVariable(TEXT("GAMEFLOW_VOICE_CHAT_PORT")));

Godot

var region := OS.get_environment("GAMEFLOW_REGION")
var port := OS.get_environment("GAMEFLOW_DEFAULT_PORT").to_int()
var voice_port := OS.get_environment("GAMEFLOW_VOICE_CHAT_PORT").to_int()

TypeScript

const region = process.env.GAMEFLOW_REGION;
const port = Number(process.env.GAMEFLOW_DEFAULT_PORT);
const voicePort = Number(process.env.GAMEFLOW_VOICE_CHAT_PORT);

Rust

let region = std::env::var("GAMEFLOW_REGION")?;
let port: u16 = std::env::var("GAMEFLOW_DEFAULT_PORT")?.parse()?;
let voice_port: u16 = std::env::var("GAMEFLOW_VOICE_CHAT_PORT")?.parse()?;

Go

region := os.Getenv("GAMEFLOW_REGION")
port, _ := strconv.Atoi(os.Getenv("GAMEFLOW_DEFAULT_PORT"))
voicePort, _ := strconv.Atoi(os.Getenv("GAMEFLOW_VOICE_CHAT_PORT"))

Your own variables

When you create a game, you can also set:

• Environment variables: key/value pairs for configuration that stays the same across servers, like LOG_LEVEL or MAX_PLAYERS.
• Launch options: extra arguments appended to your server's start command.

Read your own variables the same way as the built-in ones.