What purpose does generating a JSON file serve when invoking getStaticProps in Next.js?

Just diving into the world of Next.js. I've been going through the Next.js documentation and stumbled upon this:

Next.js creates a JSON file that contains the outcome of executing getStaticProps. This JSON file is used in client-side routing via next/link or next/router. When you go to a page pre-rendered with getStaticProps, Next.js retrieves this JSON file (pre-computed during build time) and uses it as the props for the page component.

My question is, what's the purpose of this JSON file? If the page is statically rendered into HTML during build time using the props from getStaticProps, why does the page component need those props at runtime?

javascriptnext.js

Answer №1

Utilizing a JSON file is advantageous due to its lightweight nature and faster processing compared to HTML files. When utilizing getStaticProps to fetch data from a backend, the response is typically in JSON format. This eliminates the need to constantly decode the data and generate an HTML file each time.

Another benefit of using getStaticProps to produce a JSON file is that it allows for a different type of rendering. By taking advantage of the revalidate property, you can specify the interval at which the JSON file should be regenerated. This process is much simpler than generating HTML files since the backend provides the data in a JSON format that does not require decoding.

Consider a scenario where you have an array of products to display on a page, with each product having its own individual page. With JSON data, you can easily fetch the necessary information for both the main product page and each individual product page. In contrast, using HTML files would require creating separate files for all products as well as individual pages for each product.

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