Why Are Navigator, Window, and Document Undefined in My Nuxt App?

How to Address undefined Error on Navigator/Window/Document in Nuxt

When attempting to retrieve user agent or retina information within a Nuxt application, errors may arise indicating that navigator, window, or document are undefined. This occurs due to JavaScript code being executed during server-side rendering (SSR), which lacks access to browser-specific objects like window or navigator.

Solution

To resolve this issue, wrap your logic JS code within the following construct:

<script>
  import { jsPlumb } from 'jsplumb'

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

This ensures that your code only executes on the client-side, where these objects are available. Additionally, consider using the component to render specific sections solely on the client.

<template>
  <div>
    <p>Rendered on both: server + client</p>
    
    <client-only>
      <p>Rendered only on client</p>
    </client-only>
  </div>
</template>

Additional Tips

• Check the library documentation for SSR support. If unsupported, use dynamic import or direct import.

• For example:

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

  By employing these techniques, you can access navigator, window, and document objects within Nuxt applications and resolve the undefined errors encountered.

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