Should You Use `fetch()` for Internal API Calls in `getServerSideProps` (Next.js)?

Internal API Fetch with getServerSideProps? (Next.js)

In Next.js, the getServerSideProps function allows you to fetch data from the server before rendering a page, making it suitable for SEO. However, the official documentation advises against using fetch() to call internal API routes within getServerSideProps.

Reason for Avoidance

Calling an internal API route from getServerSideProps is redundant because both run on the server. Instead, the logic from the API route should be directly implemented in getServerSideProps to avoid unnecessary HTTP requests.

Alternative Approach

To utilize the logic from an API route in getServerSideProps:

• Extract the fetching logic (e.g., database access or external API calls) into a separate function that can be shared by both the API route and getServerSideProps.
• In the API route, call this shared function to fetch and return the data.
• In getServerSideProps, call the same shared function to fetch the data directly from the server.

Example

pages/api/user.js (API route with shared logic)

import { getData } from "./userData";

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

pages/home.js (getServerSideProps using shared logic)

import { getData } from "./api/user";

export async function getServerSideProps(context) {
  const data = await getData();
  // ... other operations ...
}

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