# Auto-download from CurseForge

Mods and plugins can be auto-downloaded and upgraded from CurseForge by setting `CURSEFORGE_FILES` to a comma or space delimited list of [project-file references](#project-file-references). References removed from the declaration are automatically cleaned up and setting `CURSEFORGE_FILES` to an empty string removes all previously managed project-files.

A specific file can be omitted from each reference to allow for auto-selecting the newest version of the selected mod/plugin. The resolved `VERSION` and `TYPE` will be taken into consideration for selecting the appropriate file. 

!!! warning "CurseForge API key usage"

    A CurseForge API key must be allocated and set with `CF_API_KEY` [as described here](../types-and-platforms/mod-platforms/auto-curseforge.md#api-key).

## Project-file references

!!! tip

    Individual project files typically represent a version of the mod/plugin, but CurseForge refers to these items broadly as "files" rather than "versions". 

The following formats are supported in the list of project-file references:

- A project page URL, such as `https://www.curseforge.com/minecraft/mc-mods/jei`. _The newest applicable file will be automatically selected._
- A file page URL, such as `https://www.curseforge.com/minecraft/mc-mods/jei/files/4593548`
- Project slug, such as `jei`. _The newest applicable file will be automatically selected._
- Project ID, such as `238222`. _The newest applicable file will be automatically selected._
- Project slug or ID, `:`, and a file ID, such as `jei:4593548` or `238222:4593548`
- Project slug or ID, `@`, and a partial filename, such as `jei@10.2.1.1005`. This option is useful to refer to a version of the mod/plugin rather than looking up the file ID.

An `@` followed by the container path to a listing file can also be provided as a project-file reference. Each line is processed as a reference where blank lines and comments that start with `#` are ignored.

For example, `CURSEFORGE_FILES` can be set to "@/extras/cf-mods.txt" where the container file `/extras/cf-mods.txt` contains

```text
# This comment is ignored
jei:10.2.1.1005

# This and previous blank line are ignore
geckolib
aquaculture
naturalist
```

!!! tip "Docker Compose"

    Making use of the space delimited option, compose file declarations can be organized nicely with a [multi-line string](https://yaml-multiline.info/), such as
    
    ```yaml
          CURSEFORGE_FILES: |
            geckolib
            aquaculture
            naturalist
    ```