# React components
> Build interactive and reusable elements with custom React components in your Mintlify documentation using JSX, state, and client-side logic.
```mdx theme={null}
export const Counter = () => {
const [count, setCount] = useState(0)
const increment = () => setCount(count + 1)
const decrement = () => setCount(count - 1)
return (
{count}
)
}
```
## Constraints
React components in Mintlify run in a sandboxed MDX environment with the following constraints:
- **React hooks are pre-injected**: `useState`, `useEffect`, `useRef`, `useCallback`, `useMemo`, `useContext`, and `useReducer` are available without importing them.
- **No external npm packages**: You cannot import third-party packages (for example, `lodash`, `axios`, `date-fns`). Use browser built-ins or write the logic inline.
- **No default exports**: Use named exports (`export const MyComponent = ...`). Default exports (`export default`) are not supported.
- **No cross-snippet imports**: Snippet files cannot import other snippet files. Import all dependencies directly in the parent MDX file.
- **No JSON imports**: Importing `.json` files is not supported.
- **No code splitting**: `React.lazy` and dynamic `import()` are not supported. All component code on a page, including imported snippets, compiles into the page and loads with it.
## Import components
Component files must be in the `/snippets/` folder. Learn more about [reusable snippets](/guides/create-content-create-reusable-snippets).
:::callout{intent="note"}
Nested imports are not supported. Import all referenced components directly into the parent MDX file.
:::
Create a component file in `snippets/`:
```mdx /snippets/color-generator.jsx [expandable] theme={null}
export const ColorGenerator = () => {
const [hue, setHue] = useState(180)
const [saturation, setSaturation] = useState(50)
const [lightness, setLightness] = useState(50)
const [colors, setColors] = useState([])
useEffect(() => {
const newColors = []
for (let i = 0; i < 5; i++) {
const l = Math.max(10, Math.min(90, lightness - 20 + i * 10))
newColors.push(`hsl(${hue}, ${saturation}%, ${l}%)`)
}
setColors(newColors)
}, [hue, saturation, lightness])
const copyToClipboard = (color) => {
navigator.clipboard
.writeText(color)
.then(() => {
console.log(`Copied ${color} to clipboard!`)
})
.catch((err) => {
console.error("Failed to copy: ", err)
})
}
return (
{colors.map((color, idx) => (
copyToClipboard(color)}
/>
))}
Base color: hsl({hue}, {saturation}%, {lightness}%)
)
}
```
Then import and use it:
```mdx theme={null}
import { ColorGenerator } from "/snippets/color-generator.jsx"
```
## Considerations
- **SEO**: Search engines may not fully index client-rendered dynamic content.
- **Initial load**: Visitors may see a flash before components render.
- **Accessibility**: Ensure screen readers announce dynamic content changes.
- **Optimize dependency arrays**: Only include necessary dependencies in `useEffect`.
- **Memoize expensive operations**: Use `useMemo` or `useCallback` where appropriate.
- **Reduce re-renders**: Break large components into smaller ones.
- **Lazy loading**: Component code cannot lazy load. All components load with the page. If a component performs resource-intensive operations when it mounts, such as fetching data or heavy computation, use conditional rendering to defer mounting it until user interaction.
## Related topics
- [Pages](/docs/organize/pages.md)
- [Migrate from Docusaurus](/guides/get-started-migration-docusaurus)
- [Migrate from another platform](/guides/get-started-migration-manual)
## Related pages
- [Accordions](./create-content-components-accordions.md)
- [Badge](./create-content-components-badge.md)
- [Banner](./create-content-components-banner.md)
- [Callouts](./create-content-components-callouts.md)
- [Cards](./create-content-components-cards.md)
- [Code groups](./create-content-components-code-groups.md)
- [Color](./create-content-components-color.md)
- [Columns](./create-content-components-columns.md)
- [Examples](./create-content-components-examples.md)
- [Expandables](./create-content-components-expandables.md)
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