---
url: /api/symbols/workbox-swkit/core/routematchcallback.md
---

# RouteMatchCallback

Interface @vite-pwa/workbox-swkit/core

The "match" callback is used to determine if a `Route` should apply for a
particular URL and request. When matching occurs in response to a fetch
event from the client, the `event` object is also supplied. However, since
the match callback can be invoked outside of a fetch event, matching logic
should not assume the `event` object will always be available.
If the match callback returns a truthy value, the matching route's
`RouteHandlerCallback` will be invoked immediately. If the value returned
is a non-empty array or object, that value will be set on the handler's
`options.params` argument.