> ## Documentation Index
> Fetch the complete documentation index at: https://docs.opnform.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Code

> Use workspace and form custom code on self-hosted OpnForm

Custom Code lets you inject scripts or CSS into forms for advanced tracking, styling, and integrations.

<Warning>
  Custom code can execute JavaScript on public form pages. Enable it only
  when you trust the workspace admins who can edit forms and workspace
  settings.
</Warning>

## What this unlocks

Depending on your license and instance configuration, Custom Code can unlock:

* Workspace-level custom code
* Form-level custom code
* Custom CSS for advanced form styling
* Advanced tracking scripts and SDK integrations

## Self-hosted safety setting

Self-hosted deployments keep custom code disabled by default for safety. To allow custom code execution on self-hosted forms, set:

```bash theme={null}
CUSTOM_CODE_ENABLE_SELF_HOSTED=true
```

After changing this value, recreate the affected Docker containers so the new environment variable is loaded.

<Info>
  The environment variable controls whether custom code can execute on
  self-hosted forms. The Enterprise license controls whether the workspace can
  access the underlying advanced branding and custom code features.
</Info>

## Related pages

* [JavaScript SDK](/embedding/javascript-sdk)
* [Environment Variables](/configuration/environment-variables)
* [Self-hosted License](/deployment/self-hosted-license)
* [License Activation](/deployment/license-activation)