TypeError: how to read property 'map' of undefined in Next.js with API data fetch
I'm optimizing some code but Does anyone know how to I've looked through the documentation and I'm still confused about Hey everyone, I'm running into an issue that's driving me crazy... I'm working with a `TypeError: want to read property 'map' of undefined` when trying to render a list of items fetched from my API in a Next.js application. I am using Next.js v12.1 for this project and fetching data using `getServerSideProps`. I expect the component to render a list of items from the API response, but it seems the data is not being passed correctly to my component. Here’s the relevant part of my code in the page component: ```javascript import React from 'react'; const MyPage = ({ items }) => { return ( <div> <h1>Item List</h1> <ul> {items.map(item => ( <li key={item.id}>{item.name}</li> ))} </ul> </div> ); }; export async function getServerSideProps() { const res = await fetch('https://api.example.com/items'); const data = await res.json(); return { props: { items: data.items } }; } export default MyPage; ``` From what I can tell, the scenario arises because `data.items` can sometimes be undefined if the API response does not contain the expected structure. I have tried adding a check before the `map` function to ensure `items` is defined: ```javascript {items && items.map(item => ( <li key={item.id}>{item.name}</li> ))} ``` However, that only suppresses the behavior without rendering anything. I’ve also added a console log to check what `data` contains right before returning it: ```javascript console.log(data); ``` This outputs the entire API response, but I’m still unclear why `data.items` is sometimes undefined. Can someone help clarify this behavior, or suggest a better way to handle the API response so that I can safely map over the items? Any insights would be greatly appreciated! My development environment is Windows. For context: I'm using Javascript on Linux. I'm using Javascript LTS in this project. What are your experiences with this? The stack includes Javascript and several other technologies. What would be the recommended way to handle this? Thanks, I really appreciate it!