React 18: How to Properly Handle SSR with Dynamic Client-Side State Updates?
I'm refactoring my project and Quick question that's been bugging me - This might be a silly question, but I'm currently working on a React 18 application that utilizes server-side rendering (SSR) with Next.js... Everything is functioning well until I try to update the state dynamically on the client side after the initial render. I've implemented a simple form component that fetches the initial data from an API during SSR, but when the user submits the form to update the state, it seems that the changes don’t reflect correctly. The state updates on the client, but they don't match the server-rendered content, leading to hydration issues. I'm getting the following warning in the console: ``` Warning: Expected server HTML to contain a matching <div> in <div>. To resolve this, make sure the client-side rendered content matches the server-rendered content. ``` Here's an example of my code: ```jsx // pages/index.js import { useEffect, useState } from 'react'; export default function Home({ initialData }) { const [data, setData] = useState(initialData); const handleSubmit = (event) => { event.preventDefault(); const newData = event.target.elements.inputValue.value; setData(newData); }; return ( <div> <form onSubmit={handleSubmit}> <input type="text" name="inputValue" /> <button type="submit">Update</button> </form> <div>{data}</div> </div> ); } export async function getServerSideProps() { const res = await fetch('https://api.example.com/data'); const initialData = await res.json(); return { props: { initialData } }; } ``` I’ve tried wrapping the state update in `useEffect` with a dependency on the initial data, but that didn’t help. I also made sure to check that the initial value fetched from the API is the same as what the user inputs. Any suggestions on how to handle this correctly, considering SSR and dynamic updates? I really want to avoid hydration issues and keep the state consistent between the server and client. For context: I'm using Javascript on Ubuntu. Has anyone else encountered this? For context: I'm using Javascript on Linux. What's the best practice here? I'm working on a service that needs to handle this. Any pointers in the right direction?