How to set up Google Analytics 4 (GA4) with Nuxt.js?

Use @nuxtjs/google-gtag.

Using @nuxtjs/google-gtag

Install @nuxtjs/google-gtag

Install the Google Analytics module @nuxtjs/google-gtag in your project.
Run the following command:

npm install --save @nuxtjs/google-gtag

Add the module to nuxt.config.js

Configure Google Analytics in nuxt.config.js.
Open nuxt.config.js and add the following:

nuxt.config.js

  modules: [
    '@nuxtjs/google-gtag'
  ],
  'google-gtag': {
    id: "G-XXXXXXX",
    debug: false
  },

caution

Replace G-XXXXXXX with your own tracking ID.

Reference

You can also use @nuxtjs/gtm as an alternative method.
Please refer to the Google Analytics integration documentation for more details.