---
title: preloadRoutePattern
unstable: true
---

# unstable_preloadRoutePattern

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[MODES: data]

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<docs-warning>This API is experimental and subject to breaking changes in 
minor/patch releases. Please use with caution and pay **very** close attention 
to release notes for relevant changes.</docs-warning>

## Summary

Initialize the route-pattern matcher before creating a Data Router or static
handler with `future.unstable_routePatternMatching` enabled. Import from
`react-router/route-pattern` and call this once during application startup.
Server and browser applications must each preload their own matcher.

The matcher is statically imported by this module. Tree-shaking bundlers can
remove it from applications that do not use this function. Initialization is
synchronous, and repeated calls are safe.

## Signature

```tsx
function unstable_preloadRoutePattern(): void
```

## Returns

No return value.