[Vuejs]-How to define route in nuxt.js

Make a directory starting with underscore saying _lang and put your pages there.

• pages
  • _lang
    • Home.vue
    • About.vue

Then use page validation to only accept country codes

const country_codes = [ 'en', 'fa']
export default {
  validate({ params }) {
    return (params.lang in country_codes)
  }
}