The strict prop

When the <Route> path has a trailing slash, and you would like to match this path, including the trailing slash, with the browser's URL, then include the strict prop. For example, after changing the <Route> path from '/dashboard' to '/dashboard/', the <Route> component would still match the URL path without the trailing slash. In other words, '/dashboard' would match the <Route> component with the '/dashboard/' path.

However, after adding the strict prop, React-Router ensures that <Route> matches only if the URL has a trailing slash:

<Route
    path="/dashboard/"
    component={DashboardComponent}
    strict
/>

With this <Route> configuration in place, the '/dashboard' path would not match. However, when you add a trailing slash to the URL, as in '/dashboard/', the <Route> component with a strict prop will match and the DashboardComponent would be rendered.