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RemixSite

The RemixSite construct is a higher level CDK construct that makes it easy to create a Remix app. It provides a simple way to build and deploy the app to AWS:

  • The browser build and public static assets are deployed to an S3 Bucket, and served out from a CloudFront CDN for fast content delivery.
  • The app server is deployed to Lambda. You can deploy to Lambda@Edge instead if the edge flag is enabled. Read more about Single region vs Edge.
  • It enables you to configure custom domains for the website URL.
  • It also enable you to automatically set the environment variables for your Remix app directly from the outputs in your SST app.
  • It provides a simple interface to grant permissions for your app to access AWS resources.

Quick Start

  1. If you are creating a new Remix app, run create-remix from the root of your SST app.

    npx create-remix@latest

    And select Remix App Server as the deployment target.

    Selecte Remix App Server deployment target

    After the Remix app is created, your SST app structure should look like:

    my-sst-app
    ├─ sst.json
    ├─ services
    ├─ stacks
    └─ my-remix-app <-- new Remix app
    ├─ app
    ├─ public
    └─ remix.config.js

    You can now jump to step 3 to complete the rest of the step.

  2. If you have an existing Remix app, move the app to the root of your SST app. Your SST app structure should look like:

    my-sst-app
    ├─ sst.json
    ├─ services
    ├─ stacks
    └─ my-remix-app <-- your Remix app
    ├─ app
    ├─ public
    └─ remix.config.js

    When you created your Remix app, you might've picked a different deployment target. We need to set the deploymen target to Remix App Server. To do that, make sure your remix.config.js contain the follow values.

    module.exports = {
    // ...
    assetsBuildDirectory: "public/build",
    publicPath: "/build/",
    serverBuildPath: "build/index.js",
    serverBuildTarget: "node-cjs",
    server: undefined,
    // ...
    };
    info

    If you followed the Developer Blog or Jokes App tutorials on Remix's doc, it's likely you are using SQLite for database. SQLite databases cannot be deployed to a serverless environment. It is often used for local storage, and not recommended for modern web apps. It is recommended to use PostgreSQL, DynamoDB, or one of third party services like MongoDB for your database.

  3. Go into your Remix app, and add the static-site-env dependency to your Remix application's package.json. static-site-env enables you to automatically set the environment variables for your Remix app directly from the outputs in your SST app.

    npm install --save-dev @serverless-stack/static-site-env

    Update the package.json scripts for your Remix application.

      "scripts": {
    "build": "remix build",
    - "dev": "remix dev",
    + "dev": "sst-env -- remix dev",
    "start": "remix-serve build"
    },
  4. Add the RemixSite construct to an existing stack in your SST app. You can also create a new stack for the app.

    import { RemixSite, StackContext } as sst from "@serverless-stack/resources";

    export default function MyStack({ stack }: StackContext) {

    // ... existing constructs

    // Create the Remix site
    const site = new RemixSite(stack, "Site", {
    path: "my-remix-app/",
    });

    // Add the site's URL to stack output
    stack.addOutputs({
    URL: site.url,
    });
    }

    When you are building your SST app, RemixSite will invoke npm build inside the Remix app directory. Make sure path is pointing to the your Remix app.

    Note that we also added the site's URL to the stack output. After deploy succeeds, the URL will be printed out in the terminal.

Single region vs edge

There are two ways you can deploy the Remix app to your AWS account.

By default, the Remix app server is deployed to a single region defined in your sst.json or passed in via the --region flag. Alternatively, you can choose to deploy to the edge. When deployed to the edge, loaders/actions are running on edge location that is physically closer to the end user. In this case, the app server is deployed to AWS Lambda@Edge.

You can enable edge like this:

const site = new RemixSite(stack, "Site", {
path: "my-remix-app/",
edge: true,
});

Note that, in the case you have a centralized database, Edge locations are often far away from your database. If you are quering your database in your loaders/actions, you might experience much longer latency when deployed to the edge.

info

We recommend you to deploy to a single region when unsure.

Custom domains

You can configure the website with a custom domain hosted either on Route 53 or externally.

const site = new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: "my-app.com",
});

Note that visitors to the http:// URL will be redirected to the https:// URL.

You can also configure an alias domain to point to the main domain. For example, to setup www.my-app.com redirecting to my-app.com:

const site = new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: {
domainName: "my-app.com",
domainAlias: "www.my-app.com",
},
});

Environment variables

The RemixSite construct allows you to set the environment variables in your Remix app based on outputs from other constructs in your SST app. So you don't have to hard code the config from your backend. Let's look at how.

To expose environment variables to your Remix application you should utilise the RemixSite construct environment configuration property rather than an .env file within your Remix application root.

Imagine you have an API created using the Api construct, and you want to fetch data from the API. You'd pass the API's endpoint to your Remix app.

const api = new Api(stack, "Api", {
// ...
});

new RemixSite(stack, "Site", {
path: "path/to/site",
environment: {
API_URL: api.url,
},
});

Then you can access the API's URL in your loaders/actions:

export async function loader() {
console.log(process.env.API_URL);
}
info

Remix only supports server environment variables. If you are looking to access environment variables in your browser code, follow the Remix guide on browser environment variables.

In our example, you'd return ENV for the client from the root loader.

app/routes/index.tsx
export async function loader() {
return json({
ENV: {
API_URL: process.env.API_URL,
}
});
}

Let's take look at what is happening behind the scene.

While deploying

On sst deploy, the Remix app server is deployed to a Lambda function, and the RemixSite's environment values are set as Lambda function environment variables. In this case, process.env.API_URL will be available at runtime.

If you enabled the edge option, the Remix app server will instead get deployed to a Lambda@Edge function. We have an issue here, AWS Lambda@Edge does not support runtime environment variables. To get around this limitation, we insert a snippet to the top of your app server:

const environment = "{{ _SST_REMIX_SITE_ENVIRONMENT_ }}";
process.env = { ...process.env, ...environment };

And at deploy time, after the referenced resources have been created, the API in this case, a CloudFormation custom resource will update the app server's code and replace the placeholder {{ _SST_REMIX_SITE_ENVIRONMENT_ }} with the actual value:

const environment = { API_URL: "https://ioe7hbv67f.execute-api.us-east-1.amazonaws.com" };
process.env = { ...process.env, ...environment };

This will make process.env.API_URL available at runtime.

While developing

To use these values while developing, run sst start to start the Live Lambda Development environment.

npx sst start

Then in your Remix app to reference these variables, add the static-site-env package.

npm install --save-dev @serverless-stack/static-site-env

And tweak the Remix dev script to:

package.json
"scripts": {
"build": "remix build",
"dev": "sst-env -- remix dev",
"start": "remix-serve build"
},

Now you can start your Remix app as usual and it'll have the environment variables from your SST app.

npm run dev

There are a couple of things happening behind the scenes here:

  1. The sst start command generates a file with the values specified by the RemixSite construct's environment prop.
  2. The sst-env CLI will traverse up the directories to look for the root of your SST app.
  3. It'll then find the file that's generated in step 1.
  4. It'll load these as environment variables before running the start command.
note

sst-env only works if the Remix app is located inside the SST app or inside one of its subdirectories. For example:

/
sst.json
my-remix-app/

Using AWS services

Since the RemixSite construct deploys your Remix app to your AWS account, it's very convenient to access other resources in your AWS account in your Remix loaders/actions. RemixSite provides a simple way to grant permissions to access specific AWS resources.

Imagine you have a DynamoDB table created using the Table construct, and you want to fetch data from the Table.

const table = new Table(stack, "Table", {
// ...
});

const site = new RemixSite(stack, "Site", {
path: "my-remix-app/",
environment: {
TABLE_NAME: table.tableName,
},
});

site.attachPermissions([table]);

Note that we are also passing the table name into the environment, so the Remix loaders/actions can fetch the value process.env.TABLE_NAME when calling the DynamoDB API to query the table.

Examples

Configuring custom domains

You can configure the website with a custom domain hosted either on Route 53 or externally.

Using the basic config (Route 53 domains)

new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: "my-app.com",
});

Redirect www to non-www (Route 53 domains)

new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: {
domainName: "my-app.com",
domainAlias: "www.my-app.com",
},
});

Configuring domains across stages (Route 53 domains)

new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: {
domainName:
scope.stage === "prod" ? "my-app.com" : `${scope.stage}.my-app.com`,
domainAlias: scope.stage === "prod" ? "www.my-app.com" : undefined,
},
});

Configuring alternate domain names (Route 53 domains)

You can specify additional domain names for the site url. Note that the certificate for these names will not be automatically generated, so the certificate option must be specified. Also note that you need to manually create the Route 53 records for the alternate domain names.

import * as acm from "aws-cdk-lib/aws-certificatemanager";
import * as route53 from "aws-cdk-lib/aws-route53";
import * as route53Targets from "aws-cdk-lib/aws-route53-targets";

// Look up hosted zone
const hostedZone = route53.HostedZone.fromLookup(stack, "HostedZone", {
domainName: "domain.com",
});

// Create a certificate with alternate domain names
const certificate = new acm.DnsValidatedCertificate(stack, "Certificate", {
domainName: "foo.domain.com",
hostedZone,
region: "us-east-1",
subjectAlternativeNames: ["bar.domain.com"],
});

// Create site
const site = new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: {
domainName: "foo.domain.com",
alternateNames: ["bar.domain.com"],
cdk: {
hostedZone,
certificate,
},
},
});

// Create A and AAAA records for the alternate domain names
const recordProps = {
recordName: "bar.domain.com",
zone: hostedZone,
target: route53.RecordTarget.fromAlias(
new route53Targets.CloudFrontTarget(site.cdk.distribution)
),
};
new route53.ARecord(stack, "AlternateARecord", recordProps);
new route53.AaaaRecord(stack, "AlternateAAAARecord", recordProps);

Importing an existing certificate (Route 53 domains)

import { Certificate } from "aws-cdk-lib/aws-certificatemanager";

new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: {
domainName: "my-app.com",
cdk: {
certificate: Certificate.fromCertificateArn(stack, "MyCert", certArn),
},
},
});

Note that, the certificate needs be created in the us-east-1(N. Virginia) region as required by AWS CloudFront.

Specifying a hosted zone (Route 53 domains)

If you have multiple hosted zones for a given domain, you can choose the one you want to use to configure the domain.

import { HostedZone } from "aws-cdk-lib/aws-route53";

new RemixSite(stack, "Site", {
path: "my-remix-app/",
customDomain: {
domainName: "my-app.com",
cdk: {
hostedZone: HostedZone.fromHostedZoneAttributes(stack, "MyZone", {
hostedZoneId,
zoneName,
}),
},
},
});

Configuring externally hosted domain

import { Certificate } from "aws-cdk-lib/aws-certificatemanager";

new RemixSite(stack, "Site", {
path: "my-remix-app/",
cutomDomain: {
isExternalDomain: true,
domainName: "my-app.com",
cdk: {
certificate: Certificate.fromCertificateArn(stack, "MyCert", certArn),
},
},
});

Note that the certificate needs be created in the us-east-1(N. Virginia) region as required by AWS CloudFront, and validated. After the Distribution has been created, create a CNAME DNS record for your domain name with the Distribution's URL as the value. Here are more details on configuring SSL Certificate on externally hosted domains.

Also note that you can also migrate externally hosted domains to Route 53 by following this guide.

Configuring the Lambda Function

Configure the internally created CDK Lambda Function instance.

new RemixSite(stack, "Site", {
path: "my-remix-app/",
defaults: {
function: {
timeout: 20,
memorySize: 2048,
permissions: ["sns"],
}
},
});

Advanced examples

Using an existing S3 Bucket

import * as s3 from "aws-cdk-lib/aws-s3";

new RemixSite(stack, "Site", {
path: "my-remix-app/",
cdk: {
bucket: s3.Bucket.fromBucketName(stack, "Bucket", "my-bucket"),
},
});

Reusing CloudFront cache policies

CloudFront has a limit of 20 cache policies per AWS account. This is a hard limit, and cannot be increased. Each RemixSite creates 3 cache policies. If you plan to deploy multiple Remix sites, you can have the constructs share the same cache policies by reusing them across sites.

import * as cloudfront from "aws-cdk-lib/aws-cloudfront";

const cachePolicies = {
browserBuildCachePolicy: new cloudfront.CachePolicy(stack, "BrowserBuildStaticsCache", RemixSite.browserBuildCachePolicyProps),
publicCachePolicy: new cloudfront.CachePolicy(stack, "PublicStaticsCache", RemixSite.publicCachePolicyProps),
serverResponseCachePolicy: new cloudfront.CachePolicy(stack, "ServerResponseCache", RemixSite.serverResponseCachePolicyProps),
};

new RemixSite(stack, "Site1", {
path: "my-remix-app/",
cdk: {
cachePolicies,
}
});

new RemixSite(stack, "Site2", {
path: "another-remix-app/",
cdk: {
cachePolicies,
}
});

Protecting server function behind API Gateway

When deployed to a single region, instead of sending the request to the server function directly, you can send the request to API Gateway and have API Gateway proxy the request to the server function. With this setup, you can use features like authorizers to protect the server function.

import { Fn } from "aws-cdk-lib";
import * as origins from "aws-cdk-lib/aws-cloudfront-origins";

const api = new Api(stack, "Api");

const site = new RemixSite(stack, "Site", {
path: "my-remix-app/",
cdk: {
distribution: {
defaultBehavior: {
origin: new origins.HttpOrigin(Fn.parseDomainName(api.url)),
}
}
}
});

api.addRoutes(stack, {
"ANY /{proxy+}": {
type: "function",
cdk: {
function: site.cdk.function
},
},
});

Constructor

new RemixSite(scope, id, props)

Parameters

RemixSiteProps

customDomain?

Type : string | RemixDomainProps

The customDomain for this website. SST supports domains that are hosted either on Route 53 or externally. Note that you can also migrate externally hosted domains to Route 53 by following this guide.

new RemixSite(stack, "RemixSite", {
path: "path/to/site",
customDomain: "domain.com",
});
new RemixSite(stack, "RemixSite", {
path: "path/to/site",
customDomain: {
domainName: "domain.com",
domainAlias: "www.domain.com",
hostedZone: "domain.com"
},
});

defaults.function.memorySize?

Type : number

defaults.function.permissions?

Type : Permissions

defaults.function.timeout?

Type : number

disablePlaceholder?

Type : boolean

When running sst start, a placeholder site is deployed. This is to ensure that the site content remains unchanged, and subsequent sst start can start up quickly.

new RemixSite(stack, "RemixSite", {
path: "path/to/site",
disablePlaceholder: true,
});

edge?

Type : boolean

Default : false

The Remix app server is deployed to a Lambda function in a single region. Alternatively, you can enable this option to deploy to Lambda@Edge.

environment?

Type : Record<string, string>

An object with the key being the environment variable name.

new RemixSite(stack, "RemixSite", {
path: "path/to/site",
environment: {
API_URL: api.url,
USER_POOL_CLIENT: auth.cognitoUserPoolClient.userPoolClientId,
},
});

path

Type : string

Path to the directory where the website source is located.

waitForInvalidation?

Type : boolean

While deploying, SST waits for the CloudFront cache invalidation process to finish. This ensures that the new content will be served once the deploy command finishes. However, this process can sometimes take more than 5 mins. For non-prod environments it might make sense to pass in false. That'll skip waiting for the cache to invalidate and speed up the deploy process.

cdk.bucket?

Type : IBucket | BucketProps

Allows you to override default settings this construct uses internally to ceate the bucket

cdk.cachePolicies.buildCachePolicy?

Type : ICachePolicy

Override the CloudFront cache policy properties for browser build files.

cdk.cachePolicies.serverCachePolicy?

Type : ICachePolicy

Override the CloudFront cache policy properties for responses from the server rendering Lambda.

The default cache policy that is used in the abscene of this property is one that performs no caching of the server response.

cdk.cachePolicies.staticsCachePolicy?

Type : ICachePolicy

Override the CloudFront cache policy properties for "public" folder static files. Note: This will not include the browser build files, which have a seperate cache policy; @see buildCachePolicy.

Override the default CloudFront cache policies created internally.

cdk.distribution?

Type : RemixCdkDistributionProps

Pass in a value to override the default settings this construct uses to create the CDK Distribution internally.

cdk.id?

Type : string

Allows you to override default id for this construct.

Properties

An instance of RemixSite has the following properties.

bucketArn

Type : string

The ARN of the internally created S3 Bucket.

bucketName

Type : string

The name of the internally created S3 Bucket.

buildCachePolicyProps

Type : CachePolicyProps

The default CloudFront cache policy properties for browser build files.

customDomainUrl

Type : undefined | string

If the custom domain is enabled, this is the URL of the website with the custom domain.

distributionDomain

Type : string

The domain name of the internally created CloudFront Distribution.

distributionId

Type : string

The ID of the internally created CloudFront Distribution.

id

Type : string

serverCachePolicyProps

Type : CachePolicyProps

The default CloudFront cache policy properties for responses from the server rendering Lambda.

By default no caching is performed on the server rendering Lambda response.

staticsCachePolicyProps

Type : CachePolicyProps

The default CloudFront cache policy properties for "public" folder static files.

This policy is not applied to the browser build files; they have a seperate cache policy; @see buildCachePolicyProps.

url

Type : string

The CloudFront URL of the website.

cdk.bucket

Type : Bucket

The internally created CDK Bucket instance.

cdk.certificate?

Type : ICertificate

The AWS Certificate Manager certificate for the custom domain.

cdk.distribution

Type : Distribution

The internally created CDK Distribution instance.

cdk.function?

Type : Function

The internally created CDK Function instance. Not available in the "edge" mode.

cdk.hostedZone?

Type : IHostedZone

The Route 53 hosted zone for the custom domain.

Exposes CDK instances created within the construct.

Methods

An instance of RemixSite has the following methods.

attachPermissions

attachPermissions(permissions)

Parameters

Attaches the given list of permissions to allow the Remix server side rendering to access other AWS resources.

const site = new RemixSite(stack, "Site", {
path: "path/to/site",
});

site.attachPermissions(["sns"]);

RemixDomainProps

alternateNames?

Type : Array<string>

Default : []

Specify additional names that should route to the Cloudfront Distribution. Note, certificates for these names will not be automatically generated so the certificate option must be specified.

domainAlias?

Type : string

Default : no alias configured

An alternative domain to be assigned to the website URL. Visitors to the alias will be redirected to the main domain. (ie. www.domain.com). Use this to create a www. version of your domain and redirect visitors to the root domain.

domainName

Type : string

The domain to be assigned to the website URL (ie. domain.com). Supports domains that are hosted either on Route 53 or externally.

hostedZone?

Type : string

Default : same as the domainName

The hosted zone in Route 53 that contains the domain. By default, SST will look for a hosted zone matching the domainName that's passed in. Set this option if SST cannot find the hosted zone in Route 53.

isExternalDomain?

Type : boolean

Default : false

Set this option if the domain is not hosted on Amazon Route 53.

cdk.certificate?

Type : ICertificate

Import the certificate for the domain. By default, SST will create a certificate with the domain name. The certificate will be created in the us-east-1(N. Virginia) region as required by AWS CloudFront. Set this option if you have an existing certificate in the us-east-1 region in AWS Certificate Manager you want to use.

cdk.hostedZone?

Type : IHostedZone

Import the underlying Route 53 hosted zone.

RemixCdkDistributionProps

defaultBehavior?

Type :