# Docs Multi-instance

The `@docusaurus/plugin-content-docs` plugin can support [multi-instance](/guides/using-plugins#multi-instance-plugins-and-plugin-ids).

:::callout{intent="note"}
This feature is only useful for [versioned documentation](/guides/guides-versioning). It is recommended to be familiar with docs versioning before reading this page. If you just want [multiple sidebars](/guides/guides-sidebar-multiple-sidebars), you can do so within one plugin.
:::

## Use-cases

Sometimes you want a Docusaurus site to host 2 distinct sets of documentation (or more).

These documentations may even have different versioning/release lifecycles.

### Mobile SDKs documentation

If you build a cross-platform mobile SDK, you may have 2 documentations:

- Android SDK documentation (`v1.0`, `v1.1`)
- iOS SDK documentation (`v1.0`, `v2.0`)

In this case, you can use a distinct docs plugin instance per mobile SDK documentation.

:::callout{intent="warning"}
If each documentation instance is very large, you should rather create 2 distinct Docusaurus sites.

If someone edits the iOS documentation, is it really useful to rebuild everything, including the whole Android documentation that did not change?
:::

### Versioned and unversioned doc

Sometimes, you want some documents to be versioned, while other documents are more "global", and it feels useless to version them.

We use this pattern on the Docusaurus website itself:

- The [/docs/\*](/guides/introduction) section is versioned
- The [/community/\*](/community/support) section is unversioned

## Setup

Suppose you have 2 documentations:

- Product: some versioned doc about your product
- Community: some unversioned doc about the community around your product

In this case, you should use the same plugin twice in your site configuration.

:::callout{intent="warning"}
`@docusaurus/preset-classic` already includes a docs plugin instance for you!
:::

When using the preset:

```js title="docusaurus.config.js" {7,20}
export default {
  presets: [
    [
      '@docusaurus/preset-classic',
      {
        docs: {
          // id: 'product', // omitted => default instance
          path: 'product',
          routeBasePath: 'product',
          sidebarPath: './sidebarsProduct.js',
          // ... other options
        },
      },
    ],
  ],
  plugins: [
    [
      '@docusaurus/plugin-content-docs',
      {
        id: 'community',
        path: 'community',
        routeBasePath: 'community',
        sidebarPath: './sidebarsCommunity.js',
        // ... other options
      },
    ],
  ],
};
```

When not using the preset:

```js title="docusaurus.config.js" {6,16}
export default {
  plugins: [
    [
      '@docusaurus/plugin-content-docs',
      {
        // id: 'product', // omitted => default instance
        path: 'product',
        routeBasePath: 'product',
        sidebarPath: './sidebarsProduct.js',
        // ... other options
      },
    ],
    [
      '@docusaurus/plugin-content-docs',
      {
        id: 'community',
        path: 'community',
        routeBasePath: 'community',
        sidebarPath: './sidebarsCommunity.js',
        // ... other options
      },
    ],
  ],
};
```

Don't forget to assign a unique `id` attribute to plugin instances.

:::callout{intent="note"}
We consider that the `product` instance is the most important one, and make it the "default" instance by not assigning any ID.
:::

## Versioned paths

Each plugin instance will store versioned docs in a distinct folder.

The default plugin instance will use these paths:

- `website/versions.json`
- `website/versioned_docs`
- `website/versioned_sidebars`

The other plugin instances (with an `id` attribute) will use these paths:

- `website/[pluginId]_versions.json`
- `website/[pluginId]_versioned_docs`
- `website/[pluginId]_versioned_sidebars`

:::callout{intent="tip"}
You can omit the `id` attribute (defaults to `default`) for one of the docs plugin instances.

The instance paths will be simpler, and retro-compatible with a single-instance setup.
:::

## Tagging new versions

Each plugin instance will have its own CLI command to tag a new version. They will be displayed if you run:

```bash npm2yarn
npm run docusaurus -- --help
```

To version the product/default docs plugin instance:

```bash npm2yarn
npm run docusaurus docs:version 1.0.0
```

To version the non-default/community docs plugin instance:

```bash npm2yarn
npm run docusaurus docs:version:community 1.0.0
```

## Docs navbar items

Each docs-related [theme navbar items](/guides/api-themes-theme-configuration#navbar) take an optional `docsPluginId` attribute.

For example, if you want to have one version dropdown for each mobile SDK (iOS and Android), you could do:

```js title="docusaurus.config.js" {7,11}
export default {
  themeConfig: {
    navbar: {
      items: [
        {
          type: 'docsVersionDropdown',
          docsPluginId: 'ios',
        },
        {
          type: 'docsVersionDropdown',
          docsPluginId: 'android',
        },
      ],
    },
  },
};
```

## Related pages

- [Create a doc](./guides-docs-create-doc.md)
- [Docs Introduction](./guides-docs-introduction.md)
- [Sidebar](./guides-sidebar.md)
- [Versioning](./guides-versioning.md)

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