Extending Tina

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Tina has many advanced features that allow the entire CMS editing experience to be customized.

Customizing Fields

Tina allows any field to be customized through the ui property. This allows a custom experience to be created for your editors. Some of the main customization features are:

Customizing the rendered field component
Customizing the parsing and formatting of user input

Example

export default defineConfig({
  //...
  schema: {
    collections: [
      {
        name: 'posts',
        label: 'Blog Posts',
        path: 'content/posts',
        format: 'mdx',
        fields: [
          {
            type: 'string',
            label: 'Title',
            name: 'title',
            ui: {
              validate: (value) => {
                if (value?.length > 40) {
                  return 'Title cannot be more than 40 characters long'
                }
              },
            },
          },
          // ... other fields
        ],
      },
    ],
  },
})
// ...

Customizing the CMS instance

The tina/config.{ts,js,tsx} config has an optional cmsCallback parameter that can be added to customize the CMS instance.

// ...
export default defineConfig({
// ...
+ cmsCallback: (cms) => {
+   cms.sidebar.position = 'overlay'
+   return cms
+ }
})

The cmsCallback hook is primarily used for registering custom field plugins. It can also be used for altering Tina's UI, dynamically hiding the sidebar on specific pages, tapping into the CMS event bus, etc.

Last Edited: May 1, 2025