Get all registered routes from express router

getRoutes.ts

// small function to get routes from an express router
// https://stackoverflow.com/questions/14934452/how-to-get-all-registered-routes-in-express#answer-26275395

export function listRoutes(...args: Router[]){
    for (var i = 0; i < arguments.length;  i++) {
        if(arguments[i].stack instanceof Array){
            console.log('');
            arguments[i].stack.forEach(function(a: any){
                var route = a.route;
                if(route){
                    route.stack.forEach(function(r: any){
                        var method = r.method.toUpperCase();
                        console.log(method,'\t',route.path);
                    })
                }
            });
        }
    }
  }