无法显示 ReactJS 中的数据。错误：对象作为 React 子项无效。 如果您打算呈现子集合，请改用数组

Question

I'm trying to displaying data from my backend, but I'm getting error: Error: Objects are not valid as a React child (found: object with keys {id, price, descr, link, sqf}). If you meant to render a collection of children, use an array instead.

I've been searching for solution and I came across.map but it doesn't work throws again an error.

import React, { useState, useEffect } from 'react';
import ArticleService from '../services/articles';

const Dashboard = () => {
  const [content, setContent] = useState('');

  useEffect(() => {
    ArticleService.articles().then(
      (response) => {
        setContent(response.data);
      },
      (error) => {
        const _content =
          (error.response &&
            error.response.data &&
            error.response.data.message) ||
          error.message ||
          error.toString();

        setContent(_content);
      }
    );
  }, []);

  console.log(content);
  return (
    <div className='container'>
      <h3>{content}</h3>
    </div>
  );
};

export default Dashboard;

console.log of content looks like this:

As you can see, I get content regularly I just can't display it on dashboard page. When I try {content.price} it removes an error but still doesn't show nothing. Any solutions???

Answer 1

According to your log, content is an array of objects so you want to map the array to valid JSX, for example if you want to render in a div element:

<div className="container">
  <h3>
    {content?.map((item) => (
      <div key={item.id}>
        <div>{item.price}</div>
        <div>{item.descr}</div>
      </div>
    ))}
  </h3>
</div>

In addition, the initial state should be an empty array: useState([]) to match the expected data:

const Dashboard = () => {
  const [content, setContent] = useState([]);
  ...
};