Angular erasing all query parameters

Question

Related to but not a duplicate of: How to keep query string parameters in URL when accessing a route of an Angular 2 app?

I have a very basic Angular app, and when I

Answer 1

if you want to retrieve query paramaters, then it is done using queryParam/queryParamMap..

this.route.queryParamMap.subscribe(params => {
   console.log(params);
});

You may need to preserve the query parameters, or merge them as stated here.

https://angular.io/api/router/NavigationExtras

v4

preserveQueryParams: true

v5

queryParamsHandling: 'preserve'