[Home](./index.md) > [server](./server.md) > [startServer](./server.startserver.md) ## startServer() function Boots the server runtime, runs your init callback, and starts accepting connections. Use for: normal server startup in your entry file. Do NOT use for: restarting an already running server within the same process. **Signature:** ```typescript export declare function startServer(init: ((() => void | Promise) | ((world: World) => void | Promise))): void; ``` ## Parameters

Parameter	Type	Description
init	((() => void \| Promise<void>) \| ((world: [World](./server.world.md)) => void \| Promise<void>))	Game initialization callback. It can be sync or async. If it accepts a world parameter, the default world is created and passed in. \*\*Requires:\*\* Call once per process before using gameplay systems.

**Returns:** void ## Remarks Initialization order: 1) Physics engine (RAPIER) 2) Block texture atlas preload 3) Model preload 4) Your `init` callback (awaited if async) 5) Server starts accepting connections If `init` declares a `world` parameter, a default world is created and provided.