GitHub user dosubot[bot] added a comment to the discussion: adding custom api
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The download entries live inside a `Menu.SubMenu title={t('Download')}` block, which includes items like `ExportCsv`, `ExportXlsx`, and `DownloadAsImage` [[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/dashboard/components/SliceHeaderControls/index.tsx#L448-L497). To add your custom button: - Add a new value to the `MenuKeys` enum (imported from `src/dashboard/types` [[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/dashboard/components/SliceHeaderControls/index.tsx#L59)). - Add a new `<Menu.Item key={MenuKeys.MyCustomDownload}>` inside that Download submenu. - Handle the click in the existing `handleMenuClick` switch statement — each case calls a prop callback, e.g. `case MenuKeys.ExportCsv: props.exportCSV?.(props.slice.slice_id);` [[3]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/dashboard/components/SliceHeaderControls/index.tsx#L211-L233). You'd add your own case that fires an HTTP request (via Superset's `SupersetClient`) to your new endpoint. **2. Where to put the new endpoint (backend)** Superset's REST APIs are Flask-AppBuilder `BaseSupersetModelRestApi` classes. For example, [ChartRestApi](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/charts/api.py#L107-L134) defines custom actions as methods decorated with `@expose("/<pk>/my_action/", methods=("POST",))`, `@protect()`, `@safe` — you can see this pattern on the `cache_screenshot`, `screenshot`, `thumbnail`, and `export` endpoints [[4]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/charts/api.py#L547-L839). You have two options: - **Modify an existing API class** (like `ChartRestApi`) if your logic is chart-related. This inherits existing auth/permissions but requires maintaining a fork or upstreaming the change. - **Register your own Blueprint/API via config** without touching Superset core. You can use the [`FLASK_APP_MUTATOR`](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/docs/docs/configuration/configuring-superset.mdx#L510-L531) hook in `superset_config.py`, which receives the Flask `app` object at startup and lets you attach arbitrary routes [[5]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/config.py#L1246-L1250). Alternatively, `superset/config.py` also has a `BLUEPRINTS` config key that accepts a list of Flask `Blueprint` objects to be registered at startup [[6]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/config.py#L1287-L1289). Either approach lets you define your endpoint in a separate Python file and point it to whatever logic you need. **In summary:** add a `MenuKeys` entry + `Menu.Item` + `handleMenuClick` case in `SliceHeaderControls/index.tsx` that calls your endpoint; write that endpoint either as a new method on an existing `*RestApi` class or as your own Flask Blueprint registered via `BLUEPRINTS` or `FLASK_APP_MUTATOR` in `superset_config.py`; the endpoint itself just imports and calls whatever Python module does the actual work. Want me to dig into the exact `MenuKeys`/type definitions or how `SupersetClient` is typically used to call a custom endpoint from that menu item? <!-- Dosu Comment Footer --> *To reply, just mention [@dosu](<https://go.dosu.dev/dosubot?utm_source=github&utm_medium=bot-comment&utm_campaign=github-comment-footer-20260415&utm_content=reply-with-mention&utm_term=apache%2Fsuperset>).* --- Share context across your team and agents. 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