Where to put vue constant js

Vue is a very popular front-end JavaScript framework that provides a simple and easy way to build interactive and dynamic web applications. In Vue development, we often use constants to store some data that can be used throughout the application, such as API addresses, keys, configuration options, etc. So, where should we put constant JS in Vue?

Constant JS can be placed in many different places in VueJS. Here are a few commonly used options:

1. Using constant JS in Vue components

It is most straightforward to use constant JS in Vue components. By defining a constant in a component, you make the constant shared by that component and all of its subcomponents. This approach is ideal for situations where constants are used in only one or a few components.

For example, in the following example, we set a MESSAGE constant in the Vue component:

<template>
  <div>
    <h1>{{ message }}</h1>
  </div>
</template>

<script>
export default {
  name: 'MyComponent',
  data () {
    return {
      message: MESSAGE
    }
  }
}

const MESSAGE = 'Hello, Vue!'
</script>

2. Using constants in the global Vue instance JS

In some cases, you may need to have multiple components share a constant in your Vue application. In this case, you should consider storing the constant JS in a Vue instance object and access the object in the component that needs to use the constant.

In the following example, we set an API_ENDPOINT constant as a property of the Vue instance object:

import Vue from 'vue'

Vue.prototype.$apiEndpoint = 'https://api.example.com'

You can now use the $apiEndpoint constant in any Vue component as follows:

<template>
  <div>
    <h1>{{ apiEndpoint }}</h1>
  </div>
</template>

<script>
export default {
  name: 'MyComponent',
  computed: {
    apiEndpoint () {
      return this.$root.$apiEndpoint
    }
  }
}
</script>

3. Using constants in a separate constant fileJS

In some cases, you may want to add and use one or more constants throughout your application . In this case, you should consider storing the constant JS in a separate file and using module exports or ES6 exports to provide it to the components that need to consume it.

In the following example, we store the constants in the constants.js file and use the module export:

export const API_ENDPOINT = 'https://api.example.com'
export const APP_NAME = 'My Awesome App'

You can now use the constants defined in the constants file, in your Vue components Import them in:

<template>
  <div>
    <h1>{{ appName }}</h1>
  </div>
</template>

<script>
import { APP_NAME } from './constants'

export default {
  name: 'MyComponent',
  data () {
    return {
      appName: APP_NAME
    }
  }
}
</script>

In summary, for Vue development, you can choose to store constant JS in each Vue component, in a Vue instance object, or in a separate constant file. When choosing which option you want, consider which option will better organize and manage your Vue application.

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