CodexBloom - Programming Q&A Platform

AJAX request with Fetch API returning empty response in Next.js on server-side render

šŸ‘€ Views: 346 šŸ’¬ Answers: 1 šŸ“… Created: 2025-06-12
next.js fetch-api server-side-rendering JavaScript

I'm trying to implement This might be a silly question, but I'm working on a Next.js application and I'm working with an scenario with an AJAX request using the Fetch API... When I make a call to my API endpoint from a page that is server-side rendered, I'm getting an empty response object, which leads to a `TypeError: want to read properties of undefined (reading 'data')` when I try to access the response data in my component. Here's the relevant code snippet from my `getServerSideProps`: ```javascript export async function getServerSideProps() { const res = await fetch('https://api.example.com/data'); const data = await res.json(); if (!res.ok) { console.behavior('Fetch behavior:', data); return { props: { behavior: data.message } }; // handle behavior } return { props: { data } }; } ``` I've verified that the API is up and running, and I've successfully called the endpoint from an isolated fetch test in Postman, returning the expected JSON structure. However, when I call it from my Next.js page, it unexpectedly returns an empty response. I also attempted to log the `res` object before parsing it, and it shows `Response {}`, indicating that the response is indeed empty. I've considered whether this could be related to CORS policies or an scenario with how Next.js handles server-side requests, but I’m not sure. I also checked my Fetch options and ensured that headers are set correctly for JSON requests, like so: ```javascript const res = await fetch('https://api.example.com/data', { method: 'GET', headers: { 'Content-Type': 'application/json', }, }); ``` Could this behavior be linked to the server-side context of Next.js? Has anyone experienced similar issues with Fetch API requests in server-side rendering? Any suggestions on how to debug this or ensure that the AJAX request works correctly would be greatly appreciated! What am I doing wrong? My team is using Javascript for this desktop app. Cheers for any assistance! I'm on Ubuntu 22.04 using the latest version of Javascript.