How to get param from url in angular 4?

constructor(private activatedRoute: ActivatedRoute) {
}

ngOnInit() {
    this.activatedRoute.params.subscribe(paramsId => {
        this.id = paramsId.id;
        console.log(this.id);
    });
  
 }

In angular, They separate it into 2 kind of url.

1. URL pattern /heroes/:limit. Example: /heroes/20

   • You can get raw value by using route.snapshot.paramMap.get.
   • Subscribe from route.paramMap to get params

2. URL pattern /heroes. Example: /heroes?limit=20

   • You can get raw value by using route.snapshot.queryParamMap

Reference: All you need to know about Angular parameters

Routes

export const MyRoutes: Routes = [
    { path: '/items/:id', component: MyComponent }
]

Component

import { ActivatedRoute } from '@angular/router';
public id: string;

constructor(private route: ActivatedRoute) {}

ngOnInit() {
   this.id = this.route.snapshot.paramMap.get('id');
}

Update

I belive Dimitry Grinko's answer in this post is better than this one.

Old answer

This should do the trick retrieving the params from the url:

constructor(private activatedRoute: ActivatedRoute) {
  this.activatedRoute.queryParams.subscribe(params => {
        let date = params['startdate'];
        console.log(date); // Print the parameter to the console. 
    });
}

The local variable date should now contain the startdate parameter from the URL. The modules Router and Params can be removed (if not used somewhere else in the class).