Try this code

var vm = new Vue({
  created() {
    let urlParams = new URLSearchParams(window.location.search);
    console.log(urlParams.has('yourParam')); // true
    console.log(urlParams.get('yourParam')); // "MyParam"
  },
});

Another way (assuming you are using vue-router), is to map the query param to a prop in your router. Then you can treat it like any other prop in your component code. For example, add this route;

{ 
  path: '/mypage', 
  name: 'mypage', 
  component: MyPage, 
  props: (route) => ({ foo: route.query.foo }),  
}

Then in your component you can add the prop as normal;

props: {
  foo: {
    type: String,
    default: null,
  }
},

Then it will be available as this.foo and you can do anything you want with it (like set a watcher, etc.)

Vue 3 Composition API

(as far as now 2021, vue-router 4)

import {useRoute} from "vue-router";

//can use only in setup()
useRoute().query.test

or

//somewhere in your src files
import router from "~/router";

//can use everywhere 
router.currentRoute.value.query.test  

or

import {useRouter} from "vue-router";

//can use only in setup()
useRouter().currentRoute.value.query.test

As of this date, the correct way according to the dynamic routing docs is:

this.$route.params.yourProperty

instead of

this.$route.query.yourProperty

If your url looks something like this:

somesite.com/something/123

Where '123' is a parameter named 'id' (url like /something/:id), try with:

this.$route.params.id

You can use vue-router.I have an example below:

url: www.example.com?name=john&lastName=doe

new Vue({
  el: "#app",
  data: {
    name: '',
    lastName: '',
  },
  beforeRouteEnter(to, from, next) {
    if(Object.keys(to.query).length !== 0) { //if the url has query (?query)
      next(vm => {
        vm.name = to.query.name;
        vm.lastName = to.query.lastName;
      });
    }
    next();
  }
})

Note: In beforeRouteEnter function we cannot access the component's properties like: this.propertyName.That's why i have pass the vm to next function.It is the recommented way to access the vue instance.Actually the vm it stands for vue instance

Here is how to do it if you are using vue-router with vue3 composition api

import { useRoute } from 'vue-router'

export default {
  setup() {
    const route = useRoute()
    console.log(route.query)
  }
}

Example url: http://localhost:9528/#/course/outline/1439990638887137282

Below codes output: 1439990638887137282

this.courseId = this.$route.params.id
console.log('courseId', this.courseId)

one thing to keep in mind if you are using Hash mode then don't use this.$route.params.name only use url search param

You can get By Using this function.

console.log(this.$route.query.test)