get all routes in a vue router

In Nuxt, the routes are generated automatically so I couldn't do what @zxzak suggested.

Here's what you can do in that case.

<template v-for="item in items">
    <b-nav-item :to="item.path">
        {{item.name}}
    </b-nav-item>
</template>

export default {
    created() {
        this.$router.options.routes.forEach(route => {
            this.items.push({
                name: route.name
                , path: route.path
            })
        })
    }
    , data() {
        return {
            items: []
        }
    }
}

Since vue-router 3.5, Router instance has now a getRoutes() method.
So an up to date answer could be

<router-link 
    for="r in routes" 
    :key="r.path" 
    :to="r.path"
>
    {{ r.name }}
</router-link>

computed: {
    routes() { return this.$router.getRoutes() }
}

You can simply iterate over $router.options.routes in your template:

<nav>
  <router-link v-for="route in $router.options.routes" :key="route.path" :to="route.path">{{ route.name }}</router-link>
</nav>

Maybe add styling for the selected route:

:class="{ active: route.path === $router.currentRoute.path }"

edit: for active class, use https://router.vuejs.org/api/#active-class instead