Both the front-end and back-end packages listen for the

PORT

environment variable, causing a conflict if it is set The platform I'm trying to deploy GrowthBook on, Railway, always sets this variable

// packages/back-end/src/app.ts
app.set("port", process.env.PORT || 3100);

to something like

app.set("port", process.env.BACKEND_PORT || process.env.PORT || 3100);

Made a pull request: https://github.com/growthbook/growthbook/pull/4284