run_server

Start server mode in Roblox Studio

Description

Starts server mode in Roblox Studio (“Run” mode), which runs only the server-side code without a client. Useful for testing server scripts and backend logic. Requires StudioTestService to be available.

Endpoint

run_server

Parameters

This tool takes no parameters.

Response

ok · boolean

Returns true if server mode was started successfully

mode · string

Returns "server" to indicate the mode that was started

error · string

Error message if server mode could not be started

Examples

Start server mode

{}

Response:

{
  "ok": true,
  "mode": "server"
}

Already running

{}

Response:

{
  "error": "Already running — stop first"
}

Service unavailable

{}

Response:

{
  "error": "StudioTestService not available"
}

Notes

• Server mode only runs server-side scripts
• No client is spawned, so client scripts won’t execute
• Useful for testing ServerScriptService scripts
• Must stop the session before starting another mode
• Use stop_play to stop server mode