router-query/repository-context/docs/router/api/router/useLoaderDataHook.md

---

id: useLoaderDataHook title: useLoaderData hook

---

The useLoaderData hook returns the loader data from the closest RouteMatch in the component tree.

useLoaderData options

The useLoaderData hook accepts an options object.

opts.from option

• Type: string
• The route id of the closest parent match
• Optional, but recommended for full type safety.
• If opts.strict is true, TypeScript will warn for this option if it is not provided.
• If opts.strict is false, TypeScript will provide loosened types for the returned loader data.

opts.strict option

• Type: boolean
• Optional - default: true
• If false, the opts.from option will be ignored and types will be loosened to reflect the shared types of all possible loader data.

opts.select option

• Optional
• (loaderData: TLoaderData) => TSelected
• If supplied, this function will be called with the loader data and the return value will be returned from useLoaderData. This value will also be used to determine if the hook should re-render its parent component using shallow equality checks.

opts.structuralSharing option

• Type: boolean
• Optional
• Configures whether structural sharing is enabled for the value returned by select.
• See the Render Optimizations guide for more information.

useLoaderData returns

• If a select function is provided, the return value of the select function.
• If no select function is provided, the loader data or a loosened version of the loader data if opts.strict is false.

Examples

import { useLoaderData } from '@tanstack/react-router'

function Component() {
  const loaderData = useLoaderData({ from: '/posts/$postId' })
  //     ^? { postId: string, body: string, ... }
  // ...
}