Nuxt Web Vitals

Web Vitals: Essential module for a healthy Nuxt

Web Vitals is an initiative by Google to provide unified guidance for quality signals that are essential to delivering a great user experience on the web.

This module will gather those metrics on each page view, and send them to a provider using either Navigator.sendBeacon() or fetch()

Installation

# yarnyarn add --dev @nuxtjs/web-vitals# npmnpm install --save-dev @nuxtjs/web-vitals

Add @nuxtjs/web-vitals to the modules section of your nuxt.config.js

export default defineNuxtConfig({  modules: [    '@nuxtjs/web-vitals'  ]})

⚠️ If you are using Nuxt < v2.9 you have to install the module as a dependency (no --save-dev or --dev flags). If you are Nuxt 2.9+ (but not Nuxt 3) you should add the module to buildModules instead of modules.

Options

export default defineNuxtConfig({  webVitals: {    // provider: '', // auto detectd    debug: false,    disabled: false  }})

Providers

Google Analytics

Report WebVitals to GA

Create a GA property and get trackingID

Either provide GOOGLE_ANALYTICS_ID environement variable or set inside nuxt.config:

(Top level googleAnalytics.id is supported for backward compatibility as fallback)

export default defineNuxtConfig({  webVitals: {    ga: { id: 'UA-XXXXXXXX-X' }  }})

Behavior > Events > Overview > Event Category > Event Action

Events Actions

Report WebVitals to GTM

Create a GTM property and add the tag manager to your site.

export default defineNuxtConfig({  webVitals: {    gtm: {}  }})

Vercel Analytics

Report WebVitals to Vercel

Works without configuration

Basic logger

Report WebVitals to Console

Output metrics to the console insead of sending them to a remote provider

export default defineNuxtConfig({  webVitals: {    provider: 'log',    debug: true, // debug enable metrics reporting on dev environments    disabled: false  }})

⚠️ this provider does not send WebVitals trough network, issues with navigator extensions can not be deteced with this method.

Logging to custom api

Report WebVitals to a custom api endpoint

export default defineNuxtConfig({  webVitals: {    provider: 'api',    api: { url: '/api/web-vitals' }    debug: true // debug enable metrics reporting on dev environments  })

Example body:

export default defineNuxtConfig({  href: 'http://localhost:3000/',  name: 'LCP',  value: 303.599,  rating: 'good',  delta: 303.599,  entries: [    {      name: '',      entryType: 'largest-contentful-paint',      startTime: 303.599,      duration: 0,      size: 5698,      renderTime: 303.599,      loadTime: 0,      firstAnimatedFrameTime: 0,      id: '',      url: ''    }  ],  id: 'v3-1669725914225-9792921995831',  navigationType: 'reload'})

License

MIT