Use:
FlowRouter.getParam("NAME_PARAM")
Example:
Route :
URL : http://localhost:3000/clientText/hjmusRA6wpL9JgBNp/list/15
CODE OF THE ROUTE:
FlowRouter.route('/clientText/:client/list/:amount',{ { ... } });
CODE TO TAKE THE PARAM
var client = FlowRouter.getParam(“client”);
console.log(artista); // Result is : hjmusRA6wpL9JgBNp