How to display response data array in my React app?

user_17104990 0
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I am trying to create a simple CRUD MERN Application. In this application data is displayed in my console, but I want it in my UI part.

Here is the console log: enter image description here

This is Alluser.js file where I want to display console data which is coming from my backend:

import React, { useEffect, useState } from "react";
import { Link } from "react-router-dom";
import { getUsers } from "./api";

const UserData = () => {
  const [users, setUser] = useState([]);

  useEffect(() => {
    AllUsers();
  }, []);

  const AllUsers = async () => {
    const response = await getUsers();
    console.log(response.data);
    setUser(response.data);
  };

  return (
    <div>
      <div className="container">
        <table className="table table-hover table-bordered mt-3">
          <thead>
            <tr>
              <th scope="col">No</th>
              <th scope="col">Name</th>
              <th scope="col">Email</th>
              <th scope="col">Phone</th>
              <th scope="col">Action</th>
            </tr>
          </thead>
          <tbody>
            {users.map((index,user) => {
              <tr key={index}>
                <th scope="row">{user.id}</th>
                <td>{user.email}</td>
                <td>{user.name}</td>
                <td>{user.phone}</td>
   
              </tr>;
            })}

           
          </tbody>
        </table>
      </div>
    </div>
  );
};

export default UserData;
reactjs express node.js mongodb javascript
3 Answers

It is not displaying, because of your map part, where you are not returning anything. Try this:

  {users.map((user, index) => (
      <tr key={index}>
        <th scope="row">{user.id}</th>
        <td>{user.email}</td>
        <td>{user.name}</td>
        <td>{user.phone}</td>
      </tr>;
  ))}
user_152886410 
{users.map((user,index) => {
              <tr key={index}>
                <th scope="row">{user.id}</th>
                <td>{user.email}</td>
                <td>{user.name}</td>
                <td>{user.phone}</td>
   
              </tr>;
            })}

Map function has 2 parameters which the first is your element

user_175179470

When you are mapping over an array of values, the order of the parameters of the map function should be maintained which is

map((user) => { ... })
map((user, index) => { ... })
map((user, index, array) => { ... })

In your code, you have mentioned the index parameter before the user parameter which will give you undefined when you try to access the user.[anything].

if you change the order of user and index, it should work.

also, some free advice on the code : using the index as the key is not one of the best approaches as mentioned in the official docs, you can read more about it here

user_88747170
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