gil-wiki/reference/1.getting-started/15.prerendering.md

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Prerendering	Nuxt allows pages to be statically rendered at build time to improve certain performance or SEO metrics	i-lucide-file-code-2

Nuxt allows for select pages from your application to be rendered at build time. Nuxt will serve the prebuilt pages when requested instead of generating them on the fly.

:read-more{title="Nuxt rendering modes" to="/docs/4.x/guide/concepts/rendering"}

Crawl-based Pre-rendering

Use the nuxt generate command to build and pre-render your application using the Nitro crawler. This command is similar to nuxt build with the nitro.static option set to true, or running nuxt build --prerender.

This will build your site, stand up a nuxt instance, and, by default, prerender the root page / along with any of your site's pages it links to, any of your site's pages they link to, and so on.

::code-group{sync="pm"}

npx nuxt generate

yarn nuxt generate

pnpm nuxt generate

bun x nuxt generate

deno x nuxt generate

::

You can now deploy the .output/public directory to any static hosting service or preview it locally with npx serve .output/public.

Working of the Nitro crawler:

1. Load the HTML of your application's root route (/), any non-dynamic pages in your ~/pages directory, and any other routes in the nitro.prerender.routes array.
2. Save the HTML and payload.json to the ~/.output/public/ directory to be served statically.
3. Find all anchor tags (<a href="...">) in the HTML to navigate to other routes.
4. Repeat steps 1-3 for each anchor tag found until there are no more anchor tags to crawl.

This is important to understand since pages that are not linked to a discoverable page can't be pre-rendered automatically.

Payload Extraction

Nuxt generates _payload.json alongside HTML for:

• Prerendered routes (at build time)
• ISR/SWR routes (on first request)

Payloads contain serialized data from useAsyncData and useFetch. Client-side navigation loads these cached payloads instead of re-fetching data. Configure dynamic routes like pages/[...slug].vue with route rules: '/**': { isr: true }.

::read-more{to="/docs/4.x/api/commands/generate#nuxt-generate"} Read more about the nuxt generate command. ::

Selective Pre-rendering

You can manually specify routes that Nitro will fetch and pre-render during the build or ignore routes that you don't want to pre-render like /dynamic in the nuxt.config file:

// @errors: 2353
export default defineNuxtConfig({
  nitro: {
    prerender: {
      routes: ['/user/1', '/user/2'],
      ignore: ['/dynamic'],
    },
  },
})

You can combine this with the crawlLinks option to pre-render a set of routes that the crawler can't discover like your /sitemap.xml or /robots.txt:

// @errors: 2353
export default defineNuxtConfig({
  nitro: {
    prerender: {
      crawlLinks: true,
      routes: ['/sitemap.xml', '/robots.txt'],
    },
  },
})

Setting nitro.prerender to true is similar to nitro.prerender.crawlLinks to true.

::read-more{to="https://nitro.build/config#prerender"} Read more about pre-rendering in the Nitro documentation. ::

Lastly, you can manually configure this using routeRules.

export default defineNuxtConfig({
  routeRules: {
    // Set prerender to true to configure it to be prerendered
    '/rss.xml': { prerender: true },
    // Set it to false to configure it to be skipped for prerendering
    '/this-DOES-NOT-get-prerendered': { prerender: false },
    // Everything under /blog gets prerendered as long as it
    // is linked to from another page
    '/blog/**': { prerender: true },
  },
})

::read-more{to="https://nitro.build/config#routerules"} Read more about Nitro's routeRules configuration. ::

As a shorthand, you can also configure this in a page file using defineRouteRules.

::read-more{to="/docs/4.x/guide/going-further/experimental-features#inlinerouterules" icon="i-lucide-star"} This feature is experimental and in order to use it you must enable the experimental.inlineRouteRules option in your nuxt.config. ::

<script setup>
// Or set at the page level
defineRouteRules({
  prerender: true,
})
</script>

<template>
  <div>
    <h1>Homepage</h1>
    <p>Pre-rendered at build time</p>
  </div>
</template>

This will be translated to:

export default defineNuxtConfig({
  routeRules: {
    '/': { prerender: true },
  },
})

Runtime Prerender Configuration

prerenderRoutes

You can use this at runtime within a Nuxt context to add more routes for Nitro to prerender.

<script setup>
prerenderRoutes(['/some/other/url'])
prerenderRoutes('/api/content/article/my-article')
</script>

<template>
  <div>
    <h1>This will register other routes for prerendering when prerendered</h1>
  </div>
</template>

:read-more{title="prerenderRoutes" to="/docs/4.x/api/utils/prerender-routes"}

prerender:routes Nuxt hook

This is called before prerendering for additional routes to be registered.

export default defineNuxtConfig({
  hooks: {
    async 'prerender:routes' (ctx) {
      const { pages } = await fetch('https://api.some-cms.com/pages').then(
        res => res.json(),
      )
      for (const page of pages) {
        ctx.routes.add(`/${page.name}`)
      }
    },
  },
})

prerender:generate Nitro hook

This is called for each route during prerendering. You can use this for fine-grained handling of each route that gets prerendered.

export default defineNuxtConfig({
  nitro: {
    hooks: {
      'prerender:generate' (route) {
        if (route.route?.includes('private')) {
          route.skip = true
        }
      },
    },
  },
})