[Solved]-React router get current location on main router component-Reactjs

Wrap your header in a <Route> that always renders. Then you'll have access to everything via props.

class Routes extends React.Component {
    render() {
        return (
            <Router>
                <Nav />
                <Route render={(props) => {
                  console.log(props.location)
                  return (
                    <header>{customHeader}</header>
                  )
                }} />

                <Switch>
                    <Route exact path="/" component={Home} />
                    <Route path="/about" component={About} />
                    // Other routes
                </Switch>
            </Router>
        );
    }
};