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

# yarn
yarn add --dev nuxtjs-web-vitals-inp

# npm
npm install --save-dev nuxtjs-web-vitals-inp

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

export default defineNuxtConfig({
  modules: ["nuxtjs-web-vitals-inp"],
});

:warning: 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

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,
  },
});

:warning: 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