接下来如何解决 React Hydration 错误

Question

I keep getting an error saying "Hydration failed because the initial UI does not match what was rendered on the server."

I have no idea what is causing the error so I was hoping someone else may know what is wrong. I think I narrowed down where the error is happening and posted the code below of where I think it breaks. If any more code is needed let me know.

Thanks in advance for all the help.

import React, { useEffect } from "react";
import styles from "../../styles/Home.module.css";
import Coin from "../Coin/Coin";

type CoinListProps = {
  coins: any;
};

const CoinList = ({ coins }: CoinListProps) => {
  useEffect(() => {
    console.log(coins);
  }, []);

  return (
    <div className={styles.coinList}>
      <table>
        <tr>
          <th>Coin</th>
          <th>Price</th>
          <th>24h</th>
        </tr>
        {coins.map((coin: any, index: any) => (
          <Coin key={index} coin={coin} />
        ))}
      </table>
    </div>
  );
};

export default CoinList;

Answer 1

I think you probably missed tbody in table, that will cause this error in nextjs. Try

      <table>
       <tbody>
        <tr>
          <th>Coin</th>
          <th>Price</th>
          <th>24h</th>
        </tr>
        {coins.map((coin: any, index: any) => (
          <Coin key={index} coin={coin} />
        ))}
        </tbody>
      </table>

Answer 2

If you want to suppress a hydration warning on a given component, you can pass the suppressHydrationWarning prop to it.

This signals to React that the component's content may be different once the page is re-rendered on the client-side and to ignore the error.

<Coin key={index} coin={coin} suppressHydrationWarning />

See Suppress Hydration Warning (React Docs) :

If you set suppressHydrationWarning to true, React will not warn you about mismatches in the attributes and the content of that element. It only works one level deep, and is intended to be used as an escape hatch. Don't overuse it. You can read more about hydration in the ReactDOM.hydrateRoot() documentation.