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There are many solutions to pass props to a child component via React Router, and some you’ll find are outdated.
The most simple ever is adding the props to the Route wrapper component:
const Index = props => <h1>{props.route.something}</h1>
var routes = <Route path="/" something={'here'} component={Index} />
But in this way you need to modify how you access props, via this.props.route.* instead than the usual this.props, which might or might not be acceptable.
A way to fix this is to use:
const Index = props => (
<h1>{props.something}</h1>
)
<Route path="/" render={() => <Index something={'here'} />} />