How to Fetch Internal APIs and Implement Caching in Next.js's getServerSideProps()?

Fetching Internal APIs in getServerSideProps: Best Practices and Caching

In Next.js, managing data between pages and components effectively is crucial. However, certain practices should be followed to ensure good coding practices and SEO compliance. This article addresses the issue of performing internal API fetches within getServerSideProps().

Using fetch() in getServerSideProps()

Contrary to previous understanding, the Next.js documentation advises against using fetch() to call internal API routes within getServerSideProps(). Instead, it suggests transferring the logic from the API route directly into getServerSideProps(). This eliminates an unnecessary extra request since both getServerSideProps() and API routes execute on the server.

Advantages of Extracting API Logic

Separating the fetching logic from the API route allows for its reuse not only within the API route itself but also in getServerSideProps(). This approach simplifies codebase management and enhances flexibility.

Caching Considerations

Caching plays a vital role in enhancing performance. Client-side caching using techniques like SWR is straightforward. However, achieving caching on the server requires different approaches. One technique is to implement the caching logic directly within getServerSideProps(), leveraging server-side cache mechanisms like Redis or Memcached.

Refactor Example

Consider the following example:

// pages/api/user.js
export async function getData() {
  const response = await fetch(/* external API endpoint */);
  const jsonData = await response.json();
  return jsonData;
}

export default async function handler(req, res) {
  const jsonData = await getData();
  res.status(200).json(jsonData);
}

In this instance, the getData() function, which encapsulates the fetching logic, can be utilized both in the API route handler and within getServerSideProps(). This allows for cleaner code and efficient data acquisition.

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