> Portal Navigation:
> 
> - Append `.md` to any URL under `https://dev.wix.com/docs/` to get its markdown version.
> - Pages are either content pages (article or reference text) or menu pages (a list of links to child pages).
> - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`).
> - Top-level index of all portals: https://dev.wix.com/docs/llms.txt
> - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt

## Resource: About Events & Service Plugins and the SDK



## Article: About Events & Service Plugins and the SDK

## Article Link: https://dev.wix.com/docs/velo/events-service-plugins/about-events-service-plugins-and-the-sdk.md

## Article Content:

# About Events & Service Plugins and the SDK

You can now use the [Wix JavaScript SDK](https://dev.wix.com/docs/sdk.md) instead of Velo APIs for most functionality when developing sites or building apps with Blocks. This marks the beginning of a gradual transition from using Velo APIs to using the next generation SDK. You are encouraged to start using the SDK in all new and ongoing development projects.

<blockquote class="tip">
  <strong>Learn more:</strong> To learn more about using the SDK for site development, see <a href="fallback::https://dev.wix.com/docs/velo/articles/api-overview/about-using-the-sdk">About.md Using the SDK</a> or watch our video on <a href="fallback::https://www.youtube.com/watch?v=b-yJr-6cyPQ">using the SDK in the site editor</a>.
</blockquote>

However, the following APIs are not yet supported in the SDK:

- Event handlers and service plugins when using [Blocks](https://dev.wix.com/docs/build-apps/develop-your-app/frameworks/wix-blocks/about-wix-blocks.md) or when [developing sites](https://dev.wix.com/docs/develop-websites/articles/get-started/about-developing-websites.md).
- [Data hooks](https://dev.wix.com/docs/velo/apis/wix-data/hooks/introduction.md).
- [Routers](https://dev.wix.com/docs/velo/events-service-plugins/routers/service-plugins/wix-router/introduction.md).

To use the functionality of these APIs, continue to use the existing Velo APIs.

## See also

- [About Using the SDK](https://dev.wix.com/docs/velo/articles/api-overview/about-using-the-sdk.md)
- [Migrate from Velo to the SDK](https://dev.wix.com/docs/develop-websites/articles/coding-with-velo/develop-with-the-sdk/migrate-from-velo-to-the-sdk.md)
- [About Velo APIs and the SDK](https://dev.wix.com/docs/velo/apis/about-velo-apis-and-the-sdk.md)
- [About Velo-Only APIs and the SDK](https://dev.wix.com/docs/velo/velo-only-apis/about-velo-only-apis-and-the-sdk.md)