Contents

• What is this?
• Quickstart
• Requirements
• Advanced
  • Pre-built OpenNext package
  • Additional security
• About
  • Benefits
  • Dependencies
  • Similar projects
    • Fork from cdk-nextjs
• Contributing
  • Using Projen

What is this?

A building block for Amazon's infrastructure-as-code CDK toolkit to deploy a NextJS app using AWS serverless services.

Your NextJS app is packaged using OpenNext to fit the serverless format on Lambda

Requirements

NextJs versions: >=12.3.0+ (includes 13.0.0+)

Platforms: darwin-arm64, darwin-x64, linux-arm64, linux-x64, win32-arm64, win32-x64

Quickstart

NextJS setup

Add a dev dependency [email protected] to your NextJS project.

npm install --save-dev [email protected]

CDK Construct

Use this construct in your CDK application to deploy your NextJS app to AWS.

Install the dependency using npm:

npm install --save-dev [email protected] open-next-cdk

Use the construct in your CDK application:

import { Nextjs } from 'open-next-cdk';

new Nextjs(this, 'Web', {
  nextjsPath: './web', // relative path to nextjs project root
});

Install the dependency using Maven:

<dependency>
  <groupId>io.dataspray</groupId>
  <artifactId>open-next-cdk</artifactId>
  <version>x.y.z</version>
</dependency>

Use the construct in your CDK application:

Nextjs.Builder.create(this, getConstructId())
        .nextjsPath("./web")
        .build();

Install the dependency:

go get github.com:datasprayio/open-next-cdk.git@go

Or checkout the code in the go branch.

Install the dependency:

pip install open-next-cdk

Install the dependency:

dotnet add package Dataspray.OpenNextCdk

This will automatically build your NextJS app and package it for you as part of the CDK construct.

If you would prefer to package it separately, see below:

Advanced

Pre-built OpenNext package

You may also provide already pre-built OpenNext package directly by building it yourself first:

open-next build

You will find a new folder .open-next which contains the packaging for your NextJS App. Now you can use the construct by instructing it not to build your app, just use the OpenNext folder directly:

import { Nextjs } from 'open-next-cdk';

new Nextjs(this, 'Web', {
  openNextPath: './web/.open-next', // relative path to .open-next folder
});

Additional security

import { RemovalPolicy, Stack } from "aws-cdk-lib";
import { Construct } from "constructs";
import { CfnWebAcl } from "aws-cdk-lib/aws-wafv2";
import { SecurityPolicyProtocol, type DistributionProps } from "aws-cdk-lib/aws-cloudfront";
import { Nextjs, type NextjsDistributionProps } from "cdk-nextjs-standalone";
import { Bucket, BlockPublicAccess, BucketEncryption } from "aws-cdk-lib/aws-s3";

// Because of `WebAcl`, this stack must be deployed in us-east-1. If you want
// to deploy Nextjs in another region, add WAF in separate stack deployed in us-east-1
export class UiStack {
  constructor(scope: Construct, id: string) {
    const webAcl = new CfnWebAcl(this, "WebAcl", { ... });
    new Nextjs(this, "NextSite", {
      nextjsPath: "...",
      defaults: {
        assetDeployment: {
          bucket: new Bucket(this, "NextjsAssetDeploymentBucket", {
            autoDeleteObjects: true,
            removalPolicy: RemovalPolicy.DESTROY,
            encryption: BucketEncryption.S3_MANAGED,
            enforceSSL: true,
            blockPublicAccess: BlockPublicAccess.BLOCK_ALL,
          }),
        },
        distribution: {
          functionUrlAuthType: FunctionUrlAuthType.AWS_IAM,
          cdk: {
            distribution: {
              webAclId: webAcl.attrArn,
              minimumProtocolVersion: SecurityPolicyProtocol.TLS_V1_2_2021,
            } as DistributionProps,
          },
        } satisfies Partial<NextjsDistributionProps>,
      },
    });
  }
}

About

Deploys a NextJs static site with server-side rendering and API support. Uses AWS lambda and CloudFront.

There is a new (since Next 12) standalone output mode which uses output tracing to generate a minimal server and static files. This standalone server can be converted into a CloudFront distribution and a lambda handler that handles SSR, API, and routing.

The CloudFront default origin first checks S3 for static files and falls back to an HTTP origin using a lambda function URL.

Benefits

This approach is most compatible with new NextJs features such as ESM configuration, middleware, next-auth, and React server components ("appDir").

The unmaintained @serverless-nextjs project uses the deprecated serverless NextJs build target which prevents the use of new features. This construct was created to use the new standalone output build and newer AWS features like lambda function URLs and fallback origins.

You may want to look at Serverless Stack and its NextjsSite construct for an improved developer experience if you are building serverless applications on CDK.

Dependencies

Built on top of open-next, which was partially built using the original core of cdk-nextjs-standalone.

Similar projects

This project is heavily based on

• Open-next
• https://github.com/iiroj/iiro.fi/commit/bd43222032d0dbb765e1111825f64dbb5db851d9
• https://github.com/sladg/nextjs-lambda
• https://github.com/serverless-nextjs/serverless-next.js/tree/master/packages/compat-layers/apigw-lambda-compat
• Serverless Stack
  • RemixSite construct
  • NextjsSite construct

Fork from cdk-nextjs

Compatible with: cdk-nextjs@3.2.1

This project has been initially forked from cdk-nextjs in order to publish the package to other langugages. So far notable changes are:

• Extended language support: TS, Java, Go, .NET, Python.
• Extended platform support: darwin-arm64, darwin-x64, linux-arm64, linux-x64, win32-arm64, win32-x64
• Use pre-built open-next package

Contributing

Hey there, we value every new contribution a lot 🙏🏼 thank you. Open an issue or a PR and we'll gladly help you out.

Using Projen

Most boilerplate files are pre-generated including package.json. Don't update it directly, rather update .projenrc.js then run yarn projen to re-generate the files.