I have a mongoDB which contains items in a shop. Using React, I want to render item cards based on each entry in the database. For that matter, I am using Axios for sending a GET request for my server that will handle pulling the data from the database.

My React code is this:

import React, { useEffect, useState } from 'react';
import axios from "axios";

function App() {
const [items, setItems] = useState([{}]);
useEffect(() => {
    axios.get('/item').then(res => {
       (res.data).forEach(entry => {
           setItems(prevItems => {
               return [...prevItems, entry];
           })
       });
    }).catch(err => console.log(err));
})

return (
    ...
)
}

I'm having success getting the data, but in my Chrome console I get non-stop ERR_INSUFFICIENT_RESOURCES errors which eventually leads to Chrome crashes. Why is this error happening? I am using useEffect() since the React docs says it is the equivalent to ponentDidMount() in functional ponents. What alternative can I use?

Edit: When I remove the useEffect(), the errors keep ing and using the React dev tools I see that in items I have 80 entries which means the request is triggered 10+ times and I don't understand how.

Thanks!

I have a mongoDB which contains items in a shop. Using React, I want to render item cards based on each entry in the database. For that matter, I am using Axios for sending a GET request for my server that will handle pulling the data from the database.

My React code is this:

import React, { useEffect, useState } from 'react';
import axios from "axios";

function App() {
const [items, setItems] = useState([{}]);
useEffect(() => {
    axios.get('/item').then(res => {
       (res.data).forEach(entry => {
           setItems(prevItems => {
               return [...prevItems, entry];
           })
       });
    }).catch(err => console.log(err));
})

return (
    ...
)
}

I'm having success getting the data, but in my Chrome console I get non-stop ERR_INSUFFICIENT_RESOURCES errors which eventually leads to Chrome crashes. Why is this error happening? I am using useEffect() since the React docs says it is the equivalent to ponentDidMount() in functional ponents. What alternative can I use?

Edit: When I remove the useEffect(), the errors keep ing and using the React dev tools I see that in items I have 80 entries which means the request is triggered 10+ times and I don't understand how.

Thanks!

• javascript
• reactjs
• axios

• You make the request after every render – zb22 Commented Dec 2, 2020 at 18:36
• @zb22 But even if I remove the useEffect() it still stays the same – Ziv Aviv Commented Dec 2, 2020 at 18:37
• see my updated answer – zb22 Commented Dec 2, 2020 at 18:43

1 Answer 1

You make the request after every render. add [] as second argument of useEffect() in order to make the request once after first render.

const [items, setItems] = useState([{}]);
useEffect(() => {
    axios.get('/item').then(res => {
       setItems(res.data)
    }).catch(err => console.log(err));
}, [])