Why Are Navigator, Window, and Document Undefined in Nuxt Applications?

How to Resolve Undefined Navigator, Window, and Document in Nuxt Applications

Introduction

Developers often encounter errors where navigator, window, and document remain undefined within Nuxt applications. This issue arises when attempting to access browser-related information such as UserAgent or Retina info.

Solution

To resolve this issue, wrap your JavaScript code within specific structures to ensure proper execution on the client-side only.

Wrap Code with Mounted() Hook and process.client

<script>
import { jsPlumb } from 'jsplumb'; // client-side library only, no SSR support

export default {
  mounted() {
    if (process.client) {
      // your JS code here like >> jsPlumb.ready(function () {})
    }
  },
}
</script>

Utilize Client-Only Component

<template>
  <div>
    <p>this will be rendered on both: server + client</p>
    
    <client-only>
      <p>this one will only be rendered on client</p>
    </client-only>
  </div>
</template>

Handle Unsupported SSR Packages

For libraries that do not support SSR upon import, consider using dynamic imports or direct loading:

export default {
  components: {
    [process.client & && 'VueEditor']: () => import('vue2-editor'),
  }
}

Additional Tips

• Avoid wrapping components within if you don't intend to prevent rendering.
• Dynamic imports are suitable for libraries used later in the application.
• Refer to the official Nuxt documentation for further guidance (https://nuxtjs.org/docs/2.x/features/nuxt-components/#the-client-only-component)

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