Router

Reference doc for the `sst.aws.Router` component.

The Router component lets you use a CloudFront distribution to direct requests to various parts of your application. The routes prop can route requests to function URLs, different domains, or any component that has an associated URL.

Minimal example

new sst.aws.Router("MyRouter", {
  routes: {
    "/*": "https://some-internal-service.com"
  }
});

Route to a function URL

const myFunction = new sst.aws.Function("MyFunction", {
  handler: "src/api.handler",
  url: true,
});

new sst.aws.Router("MyRouter", {
  routes: {
    "/*": myFunction.url
  }
});

Route to a bucket

const myBucket = new sst.aws.Bucket("MyBucket", {
  access: "cloudfront",
});

new sst.aws.Router("MyRouter", {
  routes: {
    "/files/*": myBucket
  }
});

Make sure to allow AWS CloudFront to access the bucket by setting the access prop on the bucket.

Route all API requests separately

new sst.aws.Router("MyRouter", {
  routes: {
    "/*": "https://myapp.com",
    "/api/*": myFunction.url
  }
});

Add a custom domain

new sst.aws.Router("MyRouter", {
  domain: "myapp.com",
  routes: {
    "/*": myFunction.url
  }
});

Constructor

new Router(name, args, opts?)

Parameters

name string
args RouterArgs
opts? ComponentResourceOptions

RouterArgs

domain?

Type Input<string | Object>

aliases?
cert?
dns?
name
redirects?

Set a custom domain for your Router.

Automatically manages domains hosted on AWS Route 53, Cloudflare, and Vercel. For other providers, you’ll need to pass in a cert that validates domain ownership and add the DNS records.

By default this assumes the domain is hosted on Route 53.

{
  domain: "example.com"
}

For domains hosted on Cloudflare.

{
  domain: {
    name: "example.com",
    dns: sst.cloudflare.dns()
  }
}

Specify a www. version of the custom domain.

{
  domain: {
    name: "domain.com",
    redirects: ["www.domain.com"]
  }
}

domain.aliases?

Type Input<string[]>

Alias domains that should be used. Unlike the redirect option, this keeps your visitors on this alias domain.

So if your users visit app2.domain.com, they will stay on app2.domain.com in their browser.

{
  domain: {
    name: "app1.domain.com",
    aliases: ["app2.domain.com"]
  }
}

domain.cert?

Type Input<string>

The ARN of an ACM (AWS Certificate Manager) certificate that proves ownership of the domain. By default, a certificate is created and validated automatically.

The certificate will be created in the us-east-1 region as required by AWS CloudFront. If you are creating your own certificate, you must also create it in us-east-1.

To manually set up a domain on an unsupported provider, you’ll need to:

Validate that you own the domain by creating an ACM certificate. You can either validate it by setting a DNS record or by verifying an email sent to the domain owner.
Once validated, set the certificate ARN as the cert and set dns to false.
Add the DNS records in your provider to point to the CloudFront distribution URL.

{
  domain: {
    name: "domain.com",
    dns: false,
    cert: "arn:aws:acm:us-east-1:112233445566:certificate/3a958790-8878-4cdc-a396-06d95064cf63"
  }
}

domain.dns?

Type Input<false | sst.aws.dns | sst.cloudflare.dns | sst.vercel.dns>

Default sst.aws.dns

The DNS provider to use for the domain. Defaults to the AWS.

Takes an adapter that can create the DNS records on the provider. This can automate validating the domain and setting up the DNS routing.

Supports Route 53, Cloudflare, and Vercel adapters. For other providers, you’ll need to set dns to false and pass in a certificate validating ownership via cert.

Specify the hosted zone ID for the Route 53 domain.

{
  domain: {
    name: "example.com",
    dns: sst.aws.dns({
      zone: "Z2FDTNDATAQYW2"
    })
  }
}

Use a domain hosted on Cloudflare, needs the Cloudflare provider.

{
  domain: {
    name: "example.com",
    dns: sst.cloudflare.dns()
  }
}

Use a domain hosted on Vercel, needs the Vercel provider.

{
  domain: {
    name: "example.com",
    dns: sst.vercel.dns()
  }
}

domain.name

Type Input<string>

The custom domain you want to use.

{
  domain: {
    name: "example.com"
  }
}

Can also include subdomains based on the current stage.

{
  domain: {
    name: `${$app.stage}.example.com`
  }
}

domain.redirects?

Type Input<string[]>

Alternate domains to be used. Visitors to the alternate domains will be redirected to the main name.

Use this to create a www. version of your domain and redirect visitors to the apex domain.

{
  domain: {
    name: "domain.com",
    redirects: ["www.domain.com"]
  }
}

invalidation?

Type Input<boolean | Object>

paths?
token?
wait?

Default Invalidation is turned off

Configure how the CloudFront cache invalidations are handled.

Enable invalidations. Setting this to true will invalidate all paths. It is equivalent to passing in { paths: ["/*"] }.

{
  invalidation: true
}

invalidation.paths?

Type Input<Input<string>[]>

Default [”/*”]

Specify an array of glob pattern of paths to invalidate.

Invalidate the index.html and all files under the products/ route. This counts as two invalidations.

{
  invalidation: {
    paths: ["/index.html", "/products/*"]
  }
}

invalidation.token?

Type Input<string>

Default A unique value is auto-generated on each deploy

The invalidation token is used to determine if the cache should be invalidated. If the token is the same as the previous deployment, the cache will not be invalidated.

{
  invalidation: {
    token: "foo123"
  }
}

invalidation.wait?

Type Input<boolean>

Default false

Configure if sst deploy should wait for the CloudFront cache invalidation to finish.

Waiting for this process to finish ensures that new content will be available after the deploy finishes. However, this process can sometimes take more than 5 mins.

{
  invalidation: {
    wait: true
  }
}

routes

Type Input<Record<string, Input<string | RouterUrlRouteArgs | RouterBucketRouteArgs>>>

A map of routes to their destinations. The key is the route path and the value can be:

A string, the destination URL.
Or an object with the above properties.

For example, you can set the destination as a URL.

{
  routes: {
    "/*": "https://example.com"
  }
}

Or, you can route to a bucket.

{
  routes: {
    "/files/*": {
      bucket: myBucket
    }
  }
}

When router receives a request, the requested path is compared with path patterns in the order they are listed. The first match determines which URL the request is routed to.

The /* route is a default route, meaning that if no routes match, the /* route will be used. It does not matter where the /* route is listed in the routes object.

Suppose you have the following three routes.

{
  routes: {
    "/api/*.json": "https://example1.com",
    "/api/*": "https://example2.com",
    "/*.xml": "https://example3.com",
  }
}

A request to /api/sample.xml will match /api/* first and route to it; even though it matches /*.xml.

However for this case, a request to /api/users will route to /api/* even though it comes after /*. This is because the /* route is the default route.

{
  routes: {
    "/*": "myapp.com",
    "/api/*": myFunction.url
  }
}

You can also customize the route behavior with injecting some code into the CloudFront Functions. To do so, pass in an object, with the destination as the url.

{
  routes: {
    "/*": {
      url: "https://example.com",
      edge: {
        viewerRequest: {
          injection: `event.request.headers["x-foo"] = "bar";`
        }
      }
    }
  }
}

You can also rewrite the request path.

{
  routes: {
    "/files/*": {
      bucket: myBucket,
      rewrite: {
        regex: "^/files/(.*)$",
        to: "/$1"
      }
    }
  }
}

transform?

Type Object

cachePolicy?
cdn?

Transform how this component creates its underlying resources.

transform.cachePolicy?

Type CachePolicyArgs | (args: CachePolicyArgs, opts: ComponentResourceOptions, name: string) => void

Transform the Cache Policy that’s attached to each CloudFront behavior.

transform.cdn?

Type CdnArgs | (args: CdnArgs, opts: ComponentResourceOptions, name: string) => void

Transform the CloudFront CDN resource.

Properties

nodes

Type Object

cdn

The underlying resources this component creates.

nodes.cdn

Type Cdn

The Amazon CloudFront CDN resource.

url

Type Output<string>

The URL of the Router.

If the domain is set, this is the URL with the custom domain. Otherwise, it’s the autogenerated CloudFront URL.

SDK

Use the SDK in your runtime to interact with your infrastructure.

RouterBucketRouteArgs

bucket?

Type Input<string | Bucket>

A bucket to route to.

For example, let’s say you have a bucket.

const myBucket = new sst.aws.Bucket("MyBucket", {
  access: "cloudfront"
});

You can set this directly as the destination for the route.

{
  routes: {
    "/files/*": {
      bucket: myBucket
    }
  }
}

Or if you have an existing bucket, you can pass in its regional domain.

{
  routes: {
    "/files/*": {
      bucket: "my-bucket.s3.us-east-1.amazonaws.com"
    }
  }
}

edge?

Type Object

viewerRequest? Input<Object>
- injection
- kvStores?
viewerResponse? Input<Object>
- injection
- kvStores?

Configure CloudFront Functions to customize the behavior of HTTP requests and responses at the edge.

edge.viewerRequest?

Type Input<Object>

Configure the viewer request function.

The viewer request function can be used to modify incoming requests before they reach your origin server. For example, you can redirect users, rewrite URLs, or add headers.

edge.viewerRequest.injection

Type Input<string>

The code to inject into the viewer request function.

By default, a viewer request function is created to add the x-forwarded-host header. The given code will be injected at the end of this function.

function handler(event) {
  // Default behavior code

  // User injected code

  return event.request;
}

To add a custom header to all requests.

{
  server: {
    edge: {
      viewerRequest: {
        injection: `event.request.headers["x-foo"] = "bar";`
      }
    }
  }
}

edge.viewerRequest.kvStores?

Type Input<Input<string>[]>

The KV stores to associate with the viewer request function.

Takes a list of CloudFront KeyValueStore ARNs.

{
  routes: {
    "/api/*": {
      edge: {
        viewerRequest: {
          kvStores: ["arn:aws:cloudfront::123456789012:key-value-store/my-store"]
        }
      }
    }
  }
}

edge.viewerResponse?

Type Input<Object>

Configure the viewer response function.

The viewer response function can be used to modify outgoing responses before they are sent to the client. For example, you can add security headers or change the response status code.

By default, no viewer response function is set. A new function will be created with the provided code.

Add a custom header to all responses

{
  routes: {
    "/api/*": {
      edge: {
        viewerResponse: {
          injection: `event.response.headers["x-foo"] = "bar";`
        }
      }
    }
  }
}

edge.viewerResponse.injection

Type Input<string>

The code to inject into the viewer response function.

By default, no viewer response function is set. A new function will be created with the provided code.

function handler(event) {
  // User injected code

  return event.response;
}

To add a custom header to all responses.

{
  server: {
    edge: {
      viewerResponse: {
        injection: `event.response.headers["x-foo"] = "bar";`
      }
    }
  }
}

edge.viewerResponse.kvStores?

Type Input<Input<string>[]>

The KV stores to associate with the viewer response function.

Takes a list of CloudFront KeyValueStore ARNs.

{
  routes: {
    "/api/*": {
      edge: {
        viewerResponse: {
          kvStores: ["arn:aws:cloudfront::123456789012:key-value-store/my-store"]
        }
      }
    }
  }
}

rewrite?

Type Input<Object>

regex
to

Rewrite the request path.

By default, if the route path is /files/* and a request comes in for /files/logo.png, the request path the destination sees is /files/logo.png. In the case of a bucket route, the file logo.png is served from the files directory in the bucket.

If you want to serve the file from the root of the bucket, you can rewrite the request path to /logo.png.

{
  routes: {
    "/files/*": {
      bucket: myBucket,
      rewrite: {
        regex: "^/files/(.*)$",
        to: "/$1"
      }
    }
  }
}

rewrite.regex

Type Input<string>

The regex to match the request path.

rewrite.to

Type Input<string>

The replacement for the matched path.

RouterUrlRouteArgs

edge?

Type Object

viewerRequest? Input<Object>
- injection
- kvStores?
viewerResponse? Input<Object>
- injection
- kvStores?

Configure CloudFront Functions to customize the behavior of HTTP requests and responses at the edge.

edge.viewerRequest?

Type Input<Object>

Configure the viewer request function.

The viewer request function can be used to modify incoming requests before they reach your origin server. For example, you can redirect users, rewrite URLs, or add headers.

edge.viewerRequest.injection

Type Input<string>

The code to inject into the viewer request function.

By default, a viewer request function is created to add the x-forwarded-host header. The given code will be injected at the end of this function.

function handler(event) {
  // Default behavior code

  // User injected code

  return event.request;
}

To add a custom header to all requests.

{
  server: {
    edge: {
      viewerRequest: {
        injection: `event.request.headers["x-foo"] = "bar";`
      }
    }
  }
}

edge.viewerRequest.kvStores?

Type Input<Input<string>[]>

The KV stores to associate with the viewer request function.

Takes a list of CloudFront KeyValueStore ARNs.

{
  routes: {
    "/api/*": {
      edge: {
        viewerRequest: {
          kvStores: ["arn:aws:cloudfront::123456789012:key-value-store/my-store"]
        }
      }
    }
  }
}

edge.viewerResponse?

Type Input<Object>

Configure the viewer response function.

The viewer response function can be used to modify outgoing responses before they are sent to the client. For example, you can add security headers or change the response status code.

By default, no viewer response function is set. A new function will be created with the provided code.

Add a custom header to all responses

{
  routes: {
    "/api/*": {
      edge: {
        viewerResponse: {
          injection: `event.response.headers["x-foo"] = "bar";`
        }
      }
    }
  }
}

edge.viewerResponse.injection

Type Input<string>

The code to inject into the viewer response function.

By default, no viewer response function is set. A new function will be created with the provided code.

function handler(event) {
  // User injected code

  return event.response;
}

To add a custom header to all responses.

{
  server: {
    edge: {
      viewerResponse: {
        injection: `event.response.headers["x-foo"] = "bar";`
      }
    }
  }
}

edge.viewerResponse.kvStores?

Type Input<Input<string>[]>

The KV stores to associate with the viewer response function.

Takes a list of CloudFront KeyValueStore ARNs.

{
  routes: {
    "/api/*": {
      edge: {
        viewerResponse: {
          kvStores: ["arn:aws:cloudfront::123456789012:key-value-store/my-store"]
        }
      }
    }
  }
}

rewrite?

Type Input<Object>

regex
to

Rewrite the request path.

If you want to serve the file from the root of the bucket, you can rewrite the request path to /logo.png.

{
  routes: {
    "/files/*": {
      bucket: myBucket,
      rewrite: {
        regex: "^/files/(.*)$",
        to: "/$1"
      }
    }
  }
}

rewrite.regex

Type Input<string>

The regex to match the request path.

rewrite.to

Type Input<string>

The replacement for the matched path.

url

Type Input<string>

The destination URL.

{
  routes: {
    "/api/*": {
      url: "https://example.com"
    }
  }
}

Router

Minimal example

Route to a function URL

Route to a bucket

Route all API requests separately

Add a custom domain

Constructor

Parameters

RouterArgs

domain?

domain.aliases?

domain.cert?

domain.dns?

domain.name

domain.redirects?

invalidation?

invalidation.paths?

invalidation.token?

invalidation.wait?

routes

transform?

transform.cachePolicy?

transform.cdn?

Properties

nodes

nodes.cdn

url

SDK

Links

RouterBucketRouteArgs

bucket?

edge?

edge.viewerRequest?

edge.viewerRequest.injection

edge.viewerRequest.kvStores?

edge.viewerResponse?

edge.viewerResponse.injection

edge.viewerResponse.kvStores?

rewrite?

rewrite.regex

rewrite.to

RouterUrlRouteArgs

edge?

edge.viewerRequest?

edge.viewerRequest.injection

edge.viewerRequest.kvStores?

edge.viewerResponse?

edge.viewerResponse.injection

edge.viewerResponse.kvStores?

rewrite?

rewrite.regex

rewrite.to

url