- default(    req: Request<ParamsDictionary, any, any, ParsedQs, Record<string, any>>,    res: Response<any, Record<string, any>>,    next: NextFunction,): void | Promise<void> - Parameters- req: Request<ParamsDictionary, any, any, ParsedQs, Record<string, any>>
- res: Response<any, Record<string, any>>
- next: NextFunction
 
- Returns void | Promise<void>
Express router for activity-related endpoints