How to make Nuxtjs global object?

In Nuxt.js, if you wish to make certain variables or objects globally accessible throughout the application, several methods can be employed. However, it is crucial to note that directly creating global variables within server-side rendering frameworks can lead to state pollution, as the server runs continuously and handles multiple requests. Therefore, the safest approach is to leverage Nuxt.js's built-in features and configurations to achieve globally accessible objects.

1. Through the Plugin System

Using plugins in Nuxt.js is a common method to inject functionality or objects globally. By creating a plugin file, you can bind the required objects to Vue's prototype or inject them into every component of the application using Nuxt's inject function.

For instance, suppose you want to add a globally accessible object named $myGlobal:

javascript
// plugins/my-global.js
export default (context, inject) => {
  const myGlobal = {
    sayHello() {
      console.log("Hello from the global object!");
    }
  };

  // Inject the object into the Vue instance and context
  inject('myGlobal', myGlobal);
}

Then, register this plugin in nuxt.config.js:

javascript
export default {
  plugins: [
    '~/plugins/my-global.js'
  ]
}

Now, you can invoke this.$myGlobal.sayHello() within any component's methods.

2. Using Vuex Store

For managing global state, Vuex is the recommended approach in Nuxt.js. By defining state, getters, mutations, and actions in the store directory, you can ensure the state's reactivity and communication between components.

For example, create a simple store:

javascript
// store/index.js
export const state = () => ({
  message: 'Hello from Vuex'
});

export const getters = {
  getMessage(state) {
    return state.message;
  }
};

In any component, access this message via this.$store.getters.getMessage.

3. Using Environment Variables and Configuration

For static values or configurations, environment variables can be utilized. Nuxt.js allows you to configure environment variables in the nuxt.config.js file and access them throughout the application via process.env.

javascript
// nuxt.config.js
export default {
  env: {
    myValue: 'Some global value'
  }
}

In any part of the application, access this value via process.env.myValue.

Summary

Choose the appropriate method based on your specific needs. For dynamic global methods or objects, the plugin system is suitable. For global state management, use Vuex. For configurations or static values, environment variables are a simple and effective choice. Be cautious to avoid directly creating global variables on the server side to prevent potential state pollution issues.