Dynamic Route Matching in Vue.js 3 SPA

Implementing dynamic routing in a Vue.js 3 application to handle parameterized URLs, with a focus on fetching data based on route parameters.
import { createRouter, createWebHistory } from 'vue-router';

// Define route components
const User = { /* ... */ };

// Create the router instance
const router = createRouter({
  history: createWebHistory(),
  routes: [
    // Dynamically match routes to their components
    { path: '/user/:id', component: User }

export default router;
This code creates a Vue Router instance with dynamic route matching. It imports the necessary functions from 'vue-router' and defines a User component. The '/user/:id' route will match any path following the '/user/' pattern and pass the 'id' as a route parameter to the User component.
import { ref } from 'vue';
import { useRoute } from 'vue-router';

export default {
  setup() {
    // Use the useRoute composable to access the current route
    const route = useRoute();
    const userData = ref({});

    // A method to fetch user data based on the route parameter
    async function fetchUserData() {
      const userId =;
      // Fetch user data from an API or other source based on the userId
      // userData.value = await fetchUserFromAPI(userId);

    // Call fetchUserData when the component is created or when the route changes
    watch(() =>, (newId, oldId) => {
      if (newId !== oldId) {
    }, { immediate: true });

    return { userData };
This code snippet is part of a Vue component that uses the 'useRoute' composable to access route parameters in a setup function, which is part of Vue 3's Composition API. It defines a ref to store user data and a method to fetch user data based on the route parameter 'id'. It also sets up a watch effect to call 'fetchUserData' whenever the route's 'id' parameter changes to ensure the component always displays up-to-date information.