vue set global variable

Explore vue set global variable with Example

Vue 3 is the latest version of the popular JavaScript framework that allows developers to build dynamic and interactive web applications. One of the key features of Vue 3 is the ability to create and use global variables, which can be accessed and modified from any component within the application.

In this blog post, we will explore vue set global variable in Vue 3 and provide an example to illustrate its usage.

Adding a Global Variable in Vue 3

Adding a global variable in Vue 3 is a straightforward process. The Vue 3 instance provides a global property called app.config.globalProperties that allows us to define global variables and methods.

Here is an example of how to add a global variable:

const app = createApp(App)
app.config.globalProperties.$myGlobalVariable = 'Hello, Vue 3!'

In the above example, we first create a Vue 3 application using the createApp function and pass in the root component (App). Then, we access the globalProperties property of the app.config object and define a new property called $myGlobalVariable. We can assign any value to this global variable, such as a string, number, or even an object.

Once the global variable is defined, we can access it from any component within our application using the $ prefix. For example:

    {{ $myGlobalVariable }}

In the above code snippet, we use the double curly braces syntax ({{ }}) to display the value of the global variable $myGlobalVariable within the template of a component.

Example: vue set global variable

Let’s consider an example where we want to display a welcome message using a global variable in Vue 3. We can modify the previous code snippet as follows:

// main.js
import { createApp } from 'vue'
import App from './App.vue'

const app = createApp(App)
app.config.globalProperties.$welcomeMessage = 'Welcome to My Vue 3 App!'

In the above code, we define a new global variable called $welcomeMessage and assign it the value “Welcome to My Vue 3 App!”. This variable can now be accessed from any component in our application.

Next, let’s update the template of a component to display the welcome message:

// WelcomeMessage.vue
    {{ $welcomeMessage }}

Now, whenever the WelcomeMessage component is rendered, it will display the value of the global variable $welcomeMessage.

By using global variables in Vue 3, we can easily share data or methods across different components without the need for complex prop passing or event handling. However, it is important to use global variables judiciously and avoid excessive reliance on them, as they can make the codebase harder to maintain and debug.


Adding global variables in Vue 3 allows us to share data or methods across components effortlessly. By leveraging the app.config.globalProperties property, we can define and access global variables from any component within our application.

Remember to use global variables sparingly and consider alternative approaches, such as Vuex for state management, when dealing with complex application data. With a proper understanding of how to add and use global variables in Vue 3, we can enhance the efficiency and flexibility of our Vue applications.

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