description: "In Nuxt 3, your routing is defined by the structure of your files inside the pages directory. However, since it uses vue-router under the hood, Nuxt offers you several ways to add custom routes in your project."
In Nuxt 3, your routing is defined by the structure of your files inside the [pages directory](/docs/guide/directory-structure/pages). However, since it uses [vue-router](https://router.vuejs.org) under the hood, Nuxt offers you several ways to add custom routes in your project.
Using [router options](/docs/guide/going-further/custom-routing#router-options), you can optionally override or extend your routes using a function that accepts the scanned routes and returns customized routes.
Nuxt will not augment any new routes you return from the `routes` function with metadata defined in `definePageMeta` of the component you provide. If you want that to happen, you should use the `pages:extend` hook which is [called at build-time](/docs/api/advanced/hooks#nuxt-hooks-build-time).
You can enable hash history in SPA mode. In this mode, router uses a hash character (#) before the actual URL that is internally passed. When enabled, the **URL is never sent to the server** and **SSR is not supported**.
```ts [nuxt.config.ts]
export default defineNuxtConfig({
ssr: false,
router: {
options: {
hashMode: true
}
}
})
```
#### Custom History (advanced)
You can optionally override history mode using a function that accepts the base URL and returns the history mode. If it returns `null` or `undefined`, Nuxt will fallback to the default history.