Building a serverless web application with a static site generator like Gatsby can be a great way to create a fast and scalable website.

In this article, we'll walk through setting up and deploying a serverless Gatsby site, using AWS Amplify as our hosting and deployment platform.

Before we start, it's important to note that Gatsby is a static site generator. It generates a set of HTML, CSS, and JavaScript files that can be served from a CDN (Content Delivery Network) or hosting platform.

In contrast to a traditional "server-rendered" web application, HTML is generated on the server and sent to the browser on each request.

One of the benefits of using a static site generator is that it can be much faster and more scalable than a server-rendered application.

Since the HTML is pre-generated and served from a CDN, the server does not need to render each request, which means the site can handle many concurrent users without any performance degradation.

You'll need to install the Gatsby CLI (Command Line Interface) on your development machine to get started with Gatsby. Run the following command.

`npm install -g gatsby-cli`

Once the Gatsby CLI is installed, you can create a new Gatsby site by running the following
command:

`gatsby new my-site`

This will create a new directory called "my-site" with a basic Gatsby project set-up. You can then navigate to the directory and start the development server by running the following commands:

    cd my-site
    gatsby develop

This will start the development server, and you can view your site by opening a web browser and navigating to "http://localhost:8000".

As you make changes to your site, the development server will automatically reload the page, making it easy to see the results of your changes in real time.

Once you're happy with your site, you can build it for production by running the following
command:

`gatsby build`

This will generate a set of static files that can be deployed to a hosting platform.

To deploy your Gatsby site to a serverless hosting platform like AWS Amplify, you'll need to sign up for an AWS account and install the Amplify CLI.

Once you have the Amplify CLI installed, you can create a new Amplify project by running the following command:

`amplify init`

This will prompt you to enter basic information about your project, such as the name and environment.

Once you have completed the setup, you can then add a hosting category to your project by running the following command:

`amplify hosting add`

This will prompt you to choose a hosting provider and configure your hosting settings. You'll want to select "S3 and CloudFront" for a Gatsby site as the hosting provider.

This will create an S3 bucket for storing your static files and a CloudFront distribution for serving the files from a CDN.

Once the hosting category has been added to your project, you can deploy your Gatsby site by running the following command:

`amplify publish`

This will build your Gatsby site and deploy the static files to the S3 bucket and CloudFront distribution. You can then access your site by navigating to the URL provided by AWS Amplify.

One of the benefits of using a static site generator like Gatsby is that it allows you to leverage the power of modern JavaScript frameworks, such as React, to build your site. Gatsby uses GraphQL to query and retrieve data from various sources, including headless CMS systems, APIs, and local files.

This makes it easy to build a dynamic, data-driven site without needing a server.

Another benefit of using a static site generator is that it can be more secure than a server-rendered application.

Since the HTML is pre-generated and served from a CDN, there is no need for a server to handle sensitive data or execute code on each request. This can reduce the risk of security vulnerabilities and attacks.

Conclusion

Building a serverless web application with a static site generator like Gatsby can be a great way to create a fast, scalable, and secure website.

By leveraging the power of modern JavaScript frameworks and hosting on a platform like AWS Amplify, you can build a dynamic, data-driven site that can handle many concurrent users without any performance degradation.

Resource

Gatsby Resource
Learn how to use Gatsby