Configuration Reference
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The following reference covers all supported configuration options in Astro. To learn more about configuring Astro, read our guide on Configuring Astro.
Top-Level Options
Section titled Top-Level OptionsType: string
Your final, deployed URL. Astro uses this full URL to generate your sitemap and canonical URLs in your final build. It is strongly recommended that you set this configuration to get the most out of Astro.
Type: string
The base path to deploy to. Astro will use this path as the root for your pages and assets both in development and in production build.
In the example below, astro dev
will start your server at /docs
.
When using this option, all of your static asset imports and URLs should add the base as a prefix. You can access this value via import.meta.env.BASE_URL
.
The value of import.meta.env.BASE_URL
will be determined by your trailingSlash
config, no matter what value you have set for base
.
A trailing slash is always included if trailingSlash: "always"
is set. If trailingSlash: "never"
is set, BASE_URL
will not include a trailing slash, even if base
includes one.
Additionally, Astro will internally manipulate the configured value of config.base
before making it available to integrations. The value of config.base
as read by integrations will also be determined by your trailingSlash
configuration in the same way.
In the example below, the values of import.meta.env.BASE_URL
and config.base
when processed will both be /docs
:
In the example below, the values of import.meta.env.BASE_URL
and config.base
when processed will both be /docs/
:
trailingSlash
Section titled trailingSlashType: 'always' | 'never' | 'ignore'
Default: 'ignore'
Set the route matching behavior of the dev server. Choose from the following options:
'always'
- Only match URLs that include a trailing slash (ex: “/foo/“)'never'
- Never match URLs that include a trailing slash (ex: “/foo”)'ignore'
- Match URLs regardless of whether a trailing ”/” exists
Use this configuration option if your production host has strict handling of how trailing slashes work or do not work.
You can also set this if you prefer to be more strict yourself, so that URLs with or without trailing slashes won’t work during development.
See Also:
- build.format
redirects
Section titled redirectsType: Record.<string, RedirectConfig>
Default: {}
astro@2.9.0
Specify a mapping of redirects where the key is the route to match and the value is the path to redirect to.
You can redirect both static and dynamic routes, but only to the same kind of route.
For example you cannot have a '/article': '/blog/[...slug]'
redirect.
For statically-generated sites with no adapter installed, this will produce a client redirect using a <meta http-equiv="refresh">
tag and does not support status codes.
When using SSR or with a static adapter in output: static
mode, status codes are supported.
Astro will serve redirected GET requests with a status of 301
and use a status of 308
for any other request method.
You can customize the redirection status code using an object in the redirect config:
output
Section titled outputType: 'static' | 'server' | 'hybrid'
Default: 'static'
Specifies the output target for builds.
'static'
- Building a static site to be deployed to any static host.'server'
- Building an app to be deployed to a host supporting SSR (server-side rendering).'hybrid'
- Building a static site with a few server-side rendered pages.
See Also:
- adapter
adapter
Section titled adapterType: AstroIntegration
Deploy to your favorite server, serverless, or edge host with build adapters. Import one of our first-party adapters for Netlify, Vercel, and more to engage Astro SSR.
See our Server-side Rendering guide for more on SSR, and our deployment guides for a complete list of hosts.
See Also:
- output
integrations
Section titled integrationsType: AstroIntegration[]
Extend Astro with custom integrations. Integrations are your one-stop-shop for adding framework support (like Solid.js), new features (like sitemaps), and new libraries (like Partytown).
Read our Integrations Guide for help getting started with Astro Integrations.
Type: string
CLI: --root
Default: "."
(current working directory)
You should only provide this option if you run the astro
CLI commands in a directory other than the project root directory. Usually, this option is provided via the CLI instead of the Astro config file, since Astro needs to know your project root before it can locate your config file.
If you provide a relative path (ex: --root: './my-project'
) Astro will resolve it against your current working directory.
Examples
Section titled ExamplessrcDir
Section titled srcDirType: string
Default: "./src"
Set the directory that Astro will read your site from.
The value can be either an absolute file system path or a path relative to the project root.
publicDir
Section titled publicDirType: string
Default: "./public"
Set the directory for your static assets. Files in this directory are served at /
during dev and copied to your build directory during build. These files are always served or copied as-is, without transform or bundling.
The value can be either an absolute file system path or a path relative to the project root.
outDir
Section titled outDirType: string
Default: "./dist"
Set the directory that astro build
writes your final build to.
The value can be either an absolute file system path or a path relative to the project root.
See Also:
- build.server
cacheDir
Section titled cacheDirType: string
Default: "./node_modules/.astro"
Set the directory for caching build artifacts. Files in this directory will be used in subsequent builds to speed up the build time.
The value can be either an absolute file system path or a path relative to the project root.
compressHTML
Section titled compressHTMLType: boolean
Default: true
This is an option to minify your HTML output and reduce the size of your HTML files. By default, Astro removes all whitespace from your HTML, including line breaks, from .astro
components. This occurs both in development mode and in the final build.
To disable HTML compression, set the compressHTML
flag to false
.
scopedStyleStrategy
Section titled scopedStyleStrategyType: 'where' | 'class' | 'attribute'
Default: 'attribute'
astro@2.4
Specify the strategy used for scoping styles within Astro components. Choose from:
'where'
- Use:where
selectors, causing no specificity increase.'class'
- Use class-based selectors, causing a +1 specificity increase.'attribute'
- Usedata-
attributes, causing a +1 specificity increase.
Using 'class'
is helpful when you want to ensure that element selectors within an Astro component override global style defaults (e.g. from a global stylesheet).
Using 'where'
gives you more control over specificity, but requires that you use higher-specificity selectors, layers, and other tools to control which selectors are applied.
Using 'attribute'
is useful when you are manipulating the class
attribute of elements and need to avoid conflicts between your own styling logic and Astro’s application of styles.
Type: ViteUserConfig
Pass additional configuration options to Vite. Useful when Astro doesn’t support some advanced configuration that you may need.
View the full vite
configuration object documentation on vitejs.dev.
Examples
Section titled ExamplesBuild Options
Section titled Build Optionsbuild.format
Section titled build.formatType: ('file' | 'directory' | 'preserve')
Default: 'directory'
Control the output file format of each page. This value may be set by an adapter for you.
'file'
: Astro will generate an HTML file named for each page route. (e.g.src/pages/about.astro
andsrc/pages/about/index.astro
both build the file/about.html
)'directory'
: Astro will generate a directory with a nestedindex.html
file for each page. (e.g.src/pages/about.astro
andsrc/pages/about/index.astro
both build the file/about/index.html
)'preserve'
: Astro will generate HTML files exactly as they appear in your source folder. (e.g.src/pages/about.astro
builds/about.html
andsrc/pages/about/index.astro
builds the file/about/index.html
)
Effect on Astro.url
Section titled Effect on Astro.urlSetting build.format
controls what Astro.url
is set to during the build. When it is:
directory
- TheAstro.url.pathname
will include a trailing slash to mimic folder behavior; ie/foo/
.file
- TheAstro.url.pathname
will include.html
; ie/foo.html
.
This means that when you create relative URLs using new URL('./relative', Astro.url)
, you will get consistent behavior between dev and build.
To prevent inconsistencies with trailing slash behaviour in dev, you can restrict the trailingSlash
option to 'always'
or 'never'
depending on your build format:
directory
- SettrailingSlash: 'always'
file
- SettrailingSlash: 'never'
build.client
Section titled build.clientType: string
Default: './dist/client'
Controls the output directory of your client-side CSS and JavaScript when output: 'server'
or output: 'hybrid'
only.
outDir
controls where the code is built to.
This value is relative to the outDir
.
build.server
Section titled build.serverType: string
Default: './dist/server'
Controls the output directory of server JavaScript when building to SSR.
This value is relative to the outDir
.
build.assets
Section titled build.assetsType: string
Default: '_astro'
astro@2.0.0
Specifies the directory in the build output where Astro-generated assets (bundled JS and CSS for example) should live.
See Also:
- outDir
build.assetsPrefix
Section titled build.assetsPrefixType: string | Record.<string, string>
Default: undefined
astro@2.2.0
Specifies the prefix for Astro-generated asset links. This can be used if assets are served from a different domain than the current site.
This requires uploading the assets in your local ./dist/_astro
folder to a corresponding /_astro/
folder on the remote domain.
To rename the _astro
path, specify a new directory in build.assets
.
To fetch all assets uploaded to the same domain (e.g. https://cdn.example.com/_astro/...
), set assetsPrefix
to the root domain as a string (regardless of your base
configuration):
Added in: astro@4.5.0
You can also pass an object to assetsPrefix
to specify a different domain for each file type.
In this case, a fallback
property is required and will be used by default for any other files.
build.serverEntry
Section titled build.serverEntryType: string
Default: 'entry.mjs'
Specifies the file name of the server entrypoint when building to SSR. This entrypoint is usually dependent on which host you are deploying to and will be set by your adapter for you.
Note that it is recommended that this file ends with .mjs
so that the runtime
detects that the file is a JavaScript module.
build.redirects
Section titled build.redirectsType: boolean
Default: true
astro@2.6.0
Specifies whether redirects will be output to HTML during the build.
This option only applies to output: 'static'
mode; in SSR redirects
are treated the same as all responses.
This option is mostly meant to be used by adapters that have special configuration files for redirects and do not need/want HTML based redirects.
build.inlineStylesheets
Section titled build.inlineStylesheetsType: 'always' | 'auto' | 'never'
Default: auto
astro@2.6.0
Control whether project styles are sent to the browser in a separate css file or inlined into <style>
tags. Choose from the following options:
'always'
- project styles are inlined into<style>
tags'auto'
- only stylesheets smaller thanViteConfig.build.assetsInlineLimit
(default: 4kb) are inlined. Otherwise, project styles are sent in external stylesheets.'never'
- project styles are sent in external stylesheets
Server Options
Section titled Server OptionsCustomize the Astro dev server, used by both astro dev
and astro preview
.
To set different configuration based on the command run (“dev”, “preview”) a function can also be passed to this configuration option.
server.host
Section titled server.hostType: string | boolean
Default: false
astro@0.24.0
Set which network IP addresses the server should listen on (i.e. non-localhost IPs).
false
- do not expose on a network IP addresstrue
- listen on all addresses, including LAN and public addresses[custom-address]
- expose on a network IP address at[custom-address]
(ex:192.168.0.1
)
server.port
Section titled server.portType: number
Default: 4321
Set which port the server should listen on.
If the given port is already in use, Astro will automatically try the next available port.
server.open
Section titled server.openType: string | boolean
Default: false
astro@4.1.0
Controls whether the dev server should open in your browser window on startup.
Pass a full URL string (e.g. ”http://example.com”) or a pathname (e.g. “/about”) to specify the URL to open.
server.headers
Section titled server.headersType: OutgoingHttpHeaders
Default: {}
astro@1.7.0
Set custom HTTP response headers to be sent in astro dev
and astro preview
.
Dev Toolbar Options
Section titled Dev Toolbar OptionsdevToolbar.enabled
Section titled devToolbar.enabledType: boolean
Default: true
Whether to enable the Astro Dev Toolbar. This toolbar allows you to inspect your page islands, see helpful audits on performance and accessibility, and more.
This option is scoped to the entire project, to only disable the toolbar for yourself, run npm run astro preferences disable devToolbar
. To disable the toolbar for all your Astro projects, run npm run astro preferences disable devToolbar --global
.
Prefetch Options
Section titled Prefetch OptionsType: boolean | object
Enable prefetching for links on your site to provide faster page transitions.
(Enabled by default on pages using the <ViewTransitions />
router. Set prefetch: false
to opt out of this behaviour.)
This configuration automatically adds a prefetch script to every page in the project
giving you access to the data-astro-prefetch
attribute.
Add this attribute to any <a />
link on your page to enable prefetching for that page.
Further customize the default prefetching behavior using the prefetch.defaultStrategy
and prefetch.prefetchAll
options.
See the Prefetch guide for more information.
prefetch.prefetchAll
Section titled prefetch.prefetchAllType: boolean
Enable prefetching for all links, including those without the data-astro-prefetch
attribute.
This value defaults to true
when using the <ViewTransitions />
router. Otherwise, the default value is false
.
When set to true
, you can disable prefetching individually by setting data-astro-prefetch="false"
on any individual links.
prefetch.defaultStrategy
Section titled prefetch.defaultStrategyType: 'tap' | 'hover' | 'viewport' | 'load'
Default: 'hover'
The default prefetch strategy to use when the data-astro-prefetch
attribute is set on a link with no value.
'tap'
: Prefetch just before you click on the link.'hover'
: Prefetch when you hover over or focus on the link. (default)'viewport'
: Prefetch as the links enter the viewport.'load'
: Prefetch all links on the page after the page is loaded.
You can override this default value and select a different strategy for any individual link by setting a value on the attribute.
Image Options
Section titled Image Optionsimage.endpoint
Section titled image.endpointType: string
Default: undefined
astro@3.1.0
Set the endpoint to use for image optimization in dev and SSR. Set to undefined
to use the default endpoint.
The endpoint will always be injected at /_image
.
image.service
Section titled image.serviceType: Object
Default: {entrypoint: 'astro/assets/services/sharp', config?: {}}
astro@2.1.0
Set which image service is used for Astro’s assets support.
The value should be an object with an entrypoint for the image service to use and optionally, a config object to pass to the service.
The service entrypoint can be either one of the included services, or a third-party package.
image.service.config.limitInputPixels
Section titled image.service.config.limitInputPixelsType: number | boolean
Default: true
astro@4.1.0
Whether or not to limit the size of images that the Sharp image service will process.
Set false
to bypass the default image size limit for the Sharp image service and process large images.
image.domains
Section titled image.domainsType: Array.<string>
Default: {domains: []}
astro@2.10.10
Defines a list of permitted image source domains for remote image optimization. No other remote images will be optimized by Astro.
This option requires an array of individual domain names as strings. Wildcards are not permitted. Instead, use image.remotePatterns
to define a list of allowed source URL patterns.
image.remotePatterns
Section titled image.remotePatternsType: Array.<RemotePattern>
Default: {remotePatterns: []}
astro@2.10.10
Defines a list of permitted image source URL patterns for remote image optimization.
remotePatterns
can be configured with four properties:
- protocol
- hostname
- port
- pathname
You can use wildcards to define the permitted hostname
and pathname
values as described below. Otherwise, only the exact values provided will be configured:
hostname
:
- Start with ’**.’ to allow all subdomains (‘endsWith’).
- Start with ’*.’ to allow only one level of subdomain.
pathname
:
- End with ’/**’ to allow all sub-routes (‘startsWith’).
- End with ’/*’ to allow only one level of sub-route.
Markdown Options
Section titled Markdown Optionsmarkdown.shikiConfig
Section titled markdown.shikiConfigType: Partial<ShikiConfig>
Shiki configuration options. See the Markdown configuration docs for usage.
markdown.syntaxHighlight
Section titled markdown.syntaxHighlightType: 'shiki' | 'prism' | false
Default: shiki
Which syntax highlighter to use, if any.
shiki
- use the Shiki highlighterprism
- use the Prism highlighterfalse
- do not apply syntax highlighting.
markdown.remarkPlugins
Section titled markdown.remarkPluginsType: RemarkPlugins
Pass remark plugins to customize how your Markdown is built. You can import and apply the plugin function (recommended), or pass the plugin name as a string.
markdown.rehypePlugins
Section titled markdown.rehypePluginsType: RehypePlugins
Pass rehype plugins to customize how your Markdown’s output HTML is processed. You can import and apply the plugin function (recommended), or pass the plugin name as a string.
markdown.gfm
Section titled markdown.gfmType: boolean
Default: true
astro@2.0.0
Astro uses GitHub-flavored Markdown by default. To disable this, set the gfm
flag to false
:
markdown.smartypants
Section titled markdown.smartypantsType: boolean
Default: true
astro@2.0.0
Astro uses the SmartyPants formatter by default. To disable this, set the smartypants
flag to false
:
markdown.remarkRehype
Section titled markdown.remarkRehypeType: RemarkRehype
Pass options to remark-rehype.
Type: object
astro@3.5.0
Configures i18n routing and allows you to specify some customization options.
See our guide for more information on internationalization in Astro
i18n.defaultLocale
Section titled i18n.defaultLocaleType: string
astro@3.5.0
The default locale of your website/application. This is a required field.
No particular language format or syntax is enforced, but we suggest using lower-case and hyphens as needed (e.g. “es”, “pt-br”) for greatest compatibility.
i18n.locales
Section titled i18n.localesType: Locales
astro@3.5.0
A list of all locales supported by the website, including the defaultLocale
. This is a required field.
Languages can be listed either as individual codes (e.g. ['en', 'es', 'pt-br']
) or mapped to a shared path
of codes (e.g. { path: "english", codes: ["en", "en-US"]}
). These codes will be used to determine the URL structure of your deployed site.
No particular language code format or syntax is enforced, but your project folders containing your content files must match exactly the locales
items in the list. In the case of multiple codes
pointing to a custom URL path prefix, store your content files in a folder with the same name as the path
configured.
i18n.fallback
Section titled i18n.fallbackType: Record.<string, string>
astro@3.5.0
The fallback strategy when navigating to pages that do not exist (e.g. a translated page has not been created).
Use this object to declare a fallback locale
route for each language you support. If no fallback is specified, then unavailable pages will return a 404.
Example
Section titled ExampleThe following example configures your content fallback strategy to redirect unavailable pages in /pt-br/
to their es
version, and unavailable pages in /fr/
to their en
version. Unavailable /es/
pages will return a 404.
i18n.routing
Section titled i18n.routingType: Routing
astro@3.7.0
Controls the routing strategy to determine your site URLs. Set this based on your folder/URL path configuration for your default language.
i18n.routing.prefixDefaultLocale
Section titled i18n.routing.prefixDefaultLocaleType: boolean
Default: false
astro@3.7.0
When false
, only non-default languages will display a language prefix.
The defaultLocale
will not show a language prefix and content files do not exist in a localized folder.
URLs will be of the form example.com/[locale]/content/
for all non-default languages, but example.com/content/
for the default locale.
When true
, all URLs will display a language prefix.
URLs will be of the form example.com/[locale]/content/
for every route, including the default language.
Localized folders are used for every language, including the default.
i18n.routing.redirectToDefaultLocale
Section titled i18n.routing.redirectToDefaultLocaleType: boolean
Default: true
astro@4.2.0
Configures whether or not the home URL (/
) generated by src/pages/index.astro
will redirect to /[defaultLocale]
when prefixDefaultLocale: true
is set.
Set redirectToDefaultLocale: false
to disable this automatic redirection at the root of your site:
i18n.routing.manual
Section titled i18n.routing.manualType: string
astro@4.6.0
When this option is enabled, Astro will disable its i18n middleware so that you can implement your own custom logic. No other routing
options (e.g. prefixDefaultLocale
) may be configured with routing: "manual"
.
You will be responsible for writing your own routing logic, or executing Astro’s i18n middleware manually alongside your own.
Legacy Flags
Section titled Legacy FlagsTo help some users migrate between versions of Astro, we occasionally introduce legacy
flags.
These flags allow you to opt in to some deprecated or otherwise outdated behavior of Astro
in the latest version, so that you can continue to upgrade and take advantage of new Astro releases.
Experimental Flags
Section titled Experimental FlagsAstro offers experimental flags to give users early access to new features. These flags are not guaranteed to be stable.
experimental.directRenderScript
Section titled experimental.directRenderScriptType: boolean
Default: false
astro@4.5.0
Enables a more reliable strategy to prevent scripts from being executed in pages where they are not used.
Scripts will directly render as declared in Astro files (including existing features like TypeScript, importing node_modules
,
and deduplicating scripts). You can also now conditionally render scripts in your Astro file.
However, this means scripts are no longer hoisted to the <head>
and multiple scripts on a page are no longer bundled together.
If you enable this option, you should check that all your <script>
tags behave as expected.
This option will be enabled by default in Astro 5.0.
experimental.actions
Section titled experimental.actionsType: boolean
Default: false
astro@4.7.0
Actions help you write type-safe backend functions you can call from anywhere. Enable server rendering using the output
property and add the actions
flag to the experimental
object:
Declare all your actions in src/actions/index.ts
. This file is the global actions handler.
Define an action using the defineAction()
utility from the astro:actions
module. These accept the handler
property to define your server-side request handler. If your action accepts arguments, apply the input
property to validate parameters with Zod.
This example defines two actions: like
and comment
. The like
action accepts a JSON object with a postId
string, while the comment
action accepts FormData with postId
, author
, and body
strings. Each handler
updates your database and return a type-safe response.
Then, call an action from your client components using the actions
object from astro:actions
. You can pass a type-safe object when using JSON, or a FormData object when using accept: 'form'
in your action definition:
For a complete overview, and to give feedback on this experimental API, see the Actions RFC.
experimental.contentCollectionCache
Section titled experimental.contentCollectionCacheType: boolean
Default: false
astro@3.5.0
Enables a persistent cache for content collections when building in static mode.
experimental.contentCollectionJsonSchema
Section titled experimental.contentCollectionJsonSchemaType: boolean
Default: false
astro@4.5.0
This feature will auto-generate a JSON schema for content collections of type: 'data'
which can be used as the $schema
value for TypeScript-style autocompletion/hints in tools like VSCode.
To enable this feature, add the experimental flag:
This experimental implementation requires you to manually reference the schema in each data entry file of the collection:
Alternatively, you can set this in your VSCode json.schemas
settings:
Note that this initial implementation uses a library with known issues for advanced Zod schemas, so you may wish to consult these limitations before enabling the experimental flag.
experimental.clientPrerender
Section titled experimental.clientPrerenderType: boolean
Default: false
astro@4.2.0
Enables pre-rendering your prefetched pages on the client in supported browsers.
This feature uses the experimental Speculation Rules Web API and enhances the default prefetch
behavior globally to prerender links on the client.
You may wish to review the possible risks when prerendering on the client before enabling this feature.
Enable client side prerendering in your astro.config.mjs
along with any desired prefetch
configuration options:
Continue to use the data-astro-prefetch
attribute on any <a />
link on your site to opt in to prefetching.
Instead of appending a <link>
tag to the head of the document or fetching the page with JavaScript, a <script>
tag will be appended with the corresponding speculation rules.
Client side prerendering requires browser support. If the Speculation Rules API is not supported, prefetch
will fallback to the supported strategy.
See the Prefetch Guide for more prefetch
options and usage.
experimental.globalRoutePriority
Section titled experimental.globalRoutePriorityType: boolean
Default: false
astro@4.2.0
Prioritizes redirects and injected routes equally alongside file-based project routes, following the same route priority order rules for all routes.
This allows more control over routing in your project by not automatically prioritizing certain types of routes, and standardizes the route priority ordering for all routes.
The following example shows which route will build certain page URLs when file-based routes, injected routes, and redirects are combined as shown below:
- File-based route:
/blog/post/[pid]
- File-based route:
/[page]
- Injected route:
/blog/[...slug]
- Redirect:
/blog/tags/[tag]
->/[tag]
- Redirect:
/posts
->/blog
With experimental.globalRoutingPriority
enabled (instead of Astro 4.0 default route priority order):
/blog/tags/astro
is built by the redirect to/tags/[tag]
(instead of the injected route/blog/[...slug]
)/blog/post/0
is built by the file-based route/blog/post/[pid]
(instead of the injected route/blog/[...slug]
)/posts
is built by the redirect to/blog
(instead of the file-based route/[page]
)
In the event of route collisions, where two routes of equal route priority attempt to build the same URL, Astro will log a warning identifying the conflicting routes.
experimental.i18nDomains
Section titled experimental.i18nDomainsType: boolean
Default: false
astro@4.3.0
Enables domain support for the experimental domains
routing strategy which allows you to configure the URL pattern of one or more supported languages to use a custom domain (or sub-domain).
When a locale is mapped to a domain, a /[locale]/
path prefix will not be used. However, localized folders within src/pages/
are still required, including for your configured defaultLocale
.
Any other locale not configured will default to a localized path-based URL according to your prefixDefaultLocale
strategy (e.g. https://example.com/[locale]/blog
).
Both page routes built and URLs returned by the astro:i18n
helper functions getAbsoluteLocaleUrl()
and getAbsoluteLocaleUrlList()
will use the options set in i18n.domains
.
See the Internationalization Guide for more details, including the limitations of this experimental feature.
experimental.security
Section titled experimental.securityType: boolean
Default: false
astro@4.6.0
Enables CSRF protection for Astro websites.
The CSRF protection works only for pages rendered on demand (SSR) using server
or hybrid
mode. The pages must opt out of prerendering in hybrid
mode.
experimental.rewriting
Section titled experimental.rewritingType: boolean
Default: false
astro@4.8.0
جديد
Enables a routing feature for rewriting requests in Astro pages, endpoints and Astro middleware, giving you programmatic control over your routes.
Use Astro.rewrite
in your .astro
files to reroute to a different page:
Use context.rewrite
in your endpoint files to reroute to a different page:
Use next("/")
in your middleware file to reroute to a different page, and then call the next middleware function:
For a complete overview, and to give feedback on this experimental API, see the Rerouting RFC.
Reference