> For the complete documentation index, see [llms.txt](https://brunx-mods.gitbook.io/brunx-mods-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://brunx-mods.gitbook.io/brunx-mods-docs/products/scripts/five-boost/frameworks/server-guide.md).

# Server guide

## Framework functions

### Identifier

***

This function is used to get the user identifier

```lua
-- This is an example from the brnx-fiveboost qb.lua file

Identifier = function(source)
    return QB.Functions.GetPlayer(source)?.PlayerData.citizenid
end
```