Vue/Vuetify - The component <v-app> is not recognized - have you properly imported and registered it?

Question

Vue/Vuetify - The component <v-app> is not recognized - have you properly imported and registered it?

Recently delving into Vue and Vuetify, I decided to create a quick app to test both frameworks. However, I encountered some issues right from the start. Despite meticulously following the steps outlined in the documentation, Vue seems unable to recognize Vuetify components. The error message I'm encountering is as follows:

vue.runtime.esm.js?ff9b:587 [Vue warn]: Unknown custom element: - did you register the component correctly? For recursive components, make sure to provide the "name" option.

found in

---> at src\App.vue

You can view the complete code on CodeSandbox by visiting https://codesandbox.io/s/40rqnl8kw

javascript vue.js vuetify.js

Answer 1

Answer №1

It seems like the issue you're facing is related to the order of operations in your code. By defining your own App component that utilizes the v-app component before Vue has been instructed to use it, Vue assumes you are referring to your custom v-app component.

To avoid this problem, make sure to include the Vue.use(Vuetify) statement before creating any new Vue instances with new Vue() which require Vuetify components. Alternatively, you can place it within the component definitions themselves at the beginning of the <script> tag after importing Vue and Vuetify in the single file component. Having multiple Vue.use(Vuetify) statements won't cause issues as only the first one will be effective—the rest will not have any impact.

Initial Error - Incorrect sequence of Vue.use() and new Vue().

new Vue({
    el: "#app",
    components: { App },
    template: "<App/>"
});

Vue.use(Vuetify);

Solution - Moving new Vue() after Vue.use() ensures proper resolution of dependencies by Vue.

Vue.use(Vuetify);

new Vue({
    el: "#app",
    components: { App },
    template: "<App/>"
});

Answer 2

It seems like the issue you're facing is related to the order of operations in your code. By defining your own App component that utilizes the v-app component before Vue has been instructed to use it, Vue assumes you are referring to your custom v-app component.

To avoid this problem, make sure to include the Vue.use(Vuetify) statement before creating any new Vue instances with new Vue() which require Vuetify components. Alternatively, you can place it within the component definitions themselves at the beginning of the <script> tag after importing Vue and Vuetify in the single file component. Having multiple Vue.use(Vuetify) statements won't cause issues as only the first one will be effective—the rest will not have any impact.

Initial Error - Incorrect sequence of Vue.use() and new Vue().

new Vue({
    el: "#app",
    components: { App },
    template: "<App/>"
});

Vue.use(Vuetify);

Solution - Moving new Vue() after Vue.use() ensures proper resolution of dependencies by Vue.

Vue.use(Vuetify);

new Vue({
    el: "#app",
    components: { App },
    template: "<App/>"
});

Answer 3

Answer №2

Encountering an error recently led me to discover another reason for its occurrence.

During my transition from Vuetify 1.5 to version 2.x, despite correctly following the order of operations mentioned in the existing solution, I continued to face the issue related to v-app being unrecognized:

Unknown custom element: <v-app> - have you properly registered the component For recursive components, don't forget to include the "name" option.

I realized that the upgrade process necessitated adding the following line to the devDependencies section of package.json, which was not initially present in my Vuetify 1.5x version:

"vuetify-loader": "^1.3.0"

(as of the time of writing, the current version is 1.3.0)

Upon implementing this change, the error ceased to persist.

Answer 4

Encountering an error recently led me to discover another reason for its occurrence.

During my transition from Vuetify 1.5 to version 2.x, despite correctly following the order of operations mentioned in the existing solution, I continued to face the issue related to v-app being unrecognized:

Unknown custom element: <v-app> - have you properly registered the component For recursive components, don't forget to include the "name" option.

I realized that the upgrade process necessitated adding the following line to the devDependencies section of package.json, which was not initially present in my Vuetify 1.5x version:

"vuetify-loader": "^1.3.0"

(as of the time of writing, the current version is 1.3.0)

Upon implementing this change, the error ceased to persist.

Answer 5

Answer №3

If you're arriving from a search engine like Google: I encountered some disruptive changes from version 1 to version 2 that rendered many Codepen examples ineffective. In order to successfully run a basic Vuetify app with navigation drawers again, I needed to make the following adjustments:

remove toolbar from <v-app toolbar>
replace v-toolbar with v-app-bar
replace v-app-bar-side-icon with v-app-bar-nav-icon
replace v-app-bar-title with v-toolbar
replace v-list-tile to v-list-item

replace all flat with text

Perhaps this information could be beneficial to someone else facing similar challenges.

(edited to include cong yu's remark)

Answer 6

If you're arriving from a search engine like Google: I encountered some disruptive changes from version 1 to version 2 that rendered many Codepen examples ineffective. In order to successfully run a basic Vuetify app with navigation drawers again, I needed to make the following adjustments:

remove toolbar from <v-app toolbar>
replace v-toolbar with v-app-bar
replace v-app-bar-side-icon with v-app-bar-nav-icon
replace v-app-bar-title with v-toolbar
replace v-list-tile to v-list-item

replace all flat with text

Perhaps this information could be beneficial to someone else facing similar challenges.

(edited to include cong yu's remark)

Answer 7

Answer №4

Update: I discovered that VuetifyLoader will automatically handle this for you.

Prior Response: Another issue to consider is if a la carte feature is enabled, you must also specify all the components you wish to include:

import Vue from 'vue'
import App from './App.vue'
import Vuetify, {
  VApp, // required
  VNavigationDrawer,
  VFooter,
  VToolbar,
  VFadeTransition
} from 'vuetify/lib'
import { Ripple } from 'vuetify/lib/directives'

Vue.use(Vuetify, {
  components: {
    VApp,
    VNavigationDrawer,
    VFooter,
    VToolbar,
    VFadeTransition
  },
  directives: {
    Ripple
  }
})

Answer 8

Update: I discovered that VuetifyLoader will automatically handle this for you.

Prior Response: Another issue to consider is if a la carte feature is enabled, you must also specify all the components you wish to include:

import Vue from 'vue'
import App from './App.vue'
import Vuetify, {
  VApp, // required
  VNavigationDrawer,
  VFooter,
  VToolbar,
  VFadeTransition
} from 'vuetify/lib'
import { Ripple } from 'vuetify/lib/directives'

Vue.use(Vuetify, {
  components: {
    VApp,
    VNavigationDrawer,
    VFooter,
    VToolbar,
    VFadeTransition
  },
  directives: {
    Ripple
  }
})

Answer 9

Answer №5

When utilizing vuetify v2.x, the registration of the vuetify plugin should be done in the following manner:

import Vue from 'vue'

/** registering vuetify plugin globally **/

import Vuetify from 'vuetify/lib'
Vue.use(Vuetify)
const opts = {}
const vuetify= new Vuetify(opts)
/****/

new Vue({
  vuetify,
}).$mount('#app')

Vuetify v3

import { createApp } from 'vue'

import App from './App.vue'

/*****/
import '@mdi/font/css/materialdesignicons.css'
import 'vuetify/lib/styles/main.sass'
import { createVuetify } from 'vuetify'
import * as components from 'vuetify/components'
import * as directives from 'vuetify/directives'

const vuetify= createVuetify({
  components,
  directives,
})
/****/

const app = createApp(App)
app.use(vuetify)

app.mount('#app')

Answer 10

When utilizing vuetify v2.x, the registration of the vuetify plugin should be done in the following manner:

import Vue from 'vue'

/** registering vuetify plugin globally **/

import Vuetify from 'vuetify/lib'
Vue.use(Vuetify)
const opts = {}
const vuetify= new Vuetify(opts)
/****/

new Vue({
  vuetify,
}).$mount('#app')

Vuetify v3

import { createApp } from 'vue'

import App from './App.vue'

/*****/
import '@mdi/font/css/materialdesignicons.css'
import 'vuetify/lib/styles/main.sass'
import { createVuetify } from 'vuetify'
import * as components from 'vuetify/components'
import * as directives from 'vuetify/directives'

const vuetify= createVuetify({
  components,
  directives,
})
/****/

const app = createApp(App)
app.use(vuetify)

app.mount('#app')

Answer 11

Answer №6

Having encountered a similar problem, I found that the culprit was the browser's cache. Don't forget to clear the cache to resolve the issue.

Answer 12

Having encountered a similar problem, I found that the culprit was the browser's cache. Don't forget to clear the cache to resolve the issue.

Answer 13

Answer №7

Even with the official Vuetify 3 (Alpha) installed, you may encounter this error because the standard demo version generated during installation does not include all required components. To resolve this issue, you need to manually add components and directives as shown below:


    import * as components from "vuetify/components";
    import * as directives from "vuetify/directives";

    const vuetify = createVuetify({
            components,
            directives,
        });

To ensure a smooth functioning of main.ts in Vuetify 3, use the following setup:


    import "vuetify/styles"; // Import Global CSS
    import { createApp } from "vue";
    import { createVuetify } from "vuetify";
    import App from "./App.vue";
    import * as components from "vuetify/components";
    import * as directives from "vuetify/directives";
    
    const app = createApp(App);
    const vuetify = createVuetify({
        components,
        directives,
    });

    app.use(vuetify).mount("#app");    
    // Alternative: app.use(vuetify); app.mount("#app");

Answer 14

Even with the official Vuetify 3 (Alpha) installed, you may encounter this error because the standard demo version generated during installation does not include all required components. To resolve this issue, you need to manually add components and directives as shown below:


    import * as components from "vuetify/components";
    import * as directives from "vuetify/directives";

    const vuetify = createVuetify({
            components,
            directives,
        });

To ensure a smooth functioning of main.ts in Vuetify 3, use the following setup:


    import "vuetify/styles"; // Import Global CSS
    import { createApp } from "vue";
    import { createVuetify } from "vuetify";
    import App from "./App.vue";
    import * as components from "vuetify/components";
    import * as directives from "vuetify/directives";
    
    const app = createApp(App);
    const vuetify = createVuetify({
        components,
        directives,
    });

    app.use(vuetify).mount("#app");    
    // Alternative: app.use(vuetify); app.mount("#app");

Answer 15

Answer №8

For those who are new to Vue and Nuxt like myself, one common mistake to watch out for is forgetting the "s" at the end of certain words. For example, instead of using buildModule, make sure to use buildModules.

Here's an example from my nuxt.config.js:

export default {
    buildModules:[
        "@nuxtjs/vuetify"
    ],
    modules:[
        "@nuxtjs/axios"
    ],
    components:true
}

Answer 16

For those who are new to Vue and Nuxt like myself, one common mistake to watch out for is forgetting the "s" at the end of certain words. For example, instead of using buildModule, make sure to use buildModules.

Here's an example from my nuxt.config.js:

export default {
    buildModules:[
        "@nuxtjs/vuetify"
    ],
    modules:[
        "@nuxtjs/axios"
    ],
    components:true
}

Answer 17

Answer №9

While trying to include vuetify through a submodule, I encountered an issue where the parent module did not have vuetify listed in its dependencies. To prevent the 'Unknown custom element' warning, I resolved this by installing the submodules dependencies using the following command:

npm install --legacy-peer-deps

Answer 18

While trying to include vuetify through a submodule, I encountered an issue where the parent module did not have vuetify listed in its dependencies. To prevent the 'Unknown custom element' warning, I resolved this by installing the submodules dependencies using the following command:

npm install --legacy-peer-deps

Vue/Vuetify - The component <v-app> is not recognized - have you properly imported and registered it?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

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