> For the complete documentation index, see [llms.txt](https://upgrade-platform.gitbook.io/upgrade-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/reference/environment-variables.md).

# Environment Variables

- [Frontend Environment](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/reference/environment-variables/frontend-environment.md): Notes on frontend config options
- [Backend Environment](https://upgrade-platform.gitbook.io/upgrade-documentation/developer-guide/reference/environment-variables/backend-environment.md): Details for Backend Configuration