> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lumi.new/llms.txt
> Use this file to discover all available pages before exploring further.
# Functions
> Leverage Lumi's backend functions to process data, handle business logic, and integrate external services—unlocking full server-side capabilities and seamless integrations.
## Easy to create
Effortlessly generate functions by describing them in the Lumi chat.
Directly describe the function you want to implement, for example:
```mdx theme={null}
I want to create a GIF sharing platform based on GIPHY's services.
```
Remember to activate the "Functions" feature in the Toolbox.
Lumi will then automatically integrate the third-party service for you.
When prompted during the process, send the required API key in the chat. Lumi will securely store it as an environment variable to prevent it from being leaked.
### Activate Functions
* Activate when creating a new project on the homepage
* Activate in an already created project
## Debugging built-in
Every function is equipped with comprehensive logs detailing its executions, outputs, and errors. You can also view the code and manually test the function yourself.