'How to fix navigator / window / document is undefined in Nuxt

I was trying to determined UserAgent and Retina info inside Nuxt application. But the application is throwing an error and showing navigatior / window is undefined. How can i get these info inside nuxt application?

const userAgent = navigator.userAgent.toLowerCase()
const isAndroid = userAgent.includes('android')
isRetina() {
  let mediaQuery
  if (typeof window !== 'undefined' && window !== null) {
    mediaQuery =
      '(-webkit-min-device-pixel-ratio: 1.25), (min--moz-device-pixel-ratio: 1.25), (-o-min-device-pixel-ratio: 5/4), (min-resolution: 1.25dppx)'
    if (window.devicePixelRatio > 1.25) {
      return true
    }
    if (window.matchMedia && window.matchMedia(mediaQuery).matches) {
      return true
    }
  }
  return false
}


Solution 1:[1]

This is the solution to fix:

  • navigator is undefined
  • window is undefined
  • document is not defined

Here is an example on how you should wrap your logic JS code

<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>

As shown here: https://nuxtjs.org/docs/2.x/internals-glossary/context

PS: mounted + process.client are kinda redundant because mounted only runs on the client.


Also, wrapping your component into <client-only> if you want it to be only client side rendered is also a good idea.

<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>

The documentation for this one is here: https://nuxtjs.org/docs/2.x/features/nuxt-components/#the-client-only-component

PS: beware because this client-only tag will only skip the rendering, not the execution, as explained here.


Some packages do not support SSR when you import them, for that you could either:

  • use a condition with a dynamic import (if the library is meant to be used later on)
  • directly like this (if you want to load a component like vue-editor)
export default {
  components: {
    [process.client && 'VueEditor']: () => import('vue2-editor'),
  }
}

Sources

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Source: Stack Overflow

Solution Source
Solution 1