How To Fix 'Uncaught TypeError: Cannot read properties of undefined' - JavaScript Debugging

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In this video we talk about how to solve a common JavaScript bug. "Uncaught Typerror: Cannot set properties of null (reading 'innerHTML')". Made by Garrett Hughes

#selftaughtdev #GarrettHughes

[jessicawailes]

Thank you. Seriously, I was trying to figure out this problem, and a glance at the code on your screen showed me exactly what I was doing wrong.

[leoable]

This video just solved my entire life, thanks man! great explanation

[Kushal]

What a great help 👍 keep up the good work

[Codewith_kachi]

Pls can you do a video on how to solve the issue of "cannot read properties of undefined (reading comments)"

[TheTalisman]

Thank you Bro, Your video helped me a lot to remember how to use JavaScript. Thanks a lot man. Please upload more videos with this kind of tips.

[shubhamaggarwal]

Uncaught TypeError: Cannot read properties of undefined (reading 'length') and i have error in this please tell
<InfiniteScroll
dataLength={articles.length}
next={fetchMoreData}
hasMore={articles.length !== totalResults}
loader={<Spinner/>}
>
error in datalength line

[tejasukalkar]

Sir I'm getting error while using react bootsrap's form tag as "Uncaught TypeError: Cannot read properties of undefined (reading 'Group')" why this error despite there is nothing wrong with the code?

[friedasimonetta]

How do you change the color of a certain array (i.e.: [0], [1], [2], etc.)? I tried to use style.color = "insert color here", but I'm getting that error in the browser...

[herikurniawan]

I have problem on manipulation in insertBefore, it's not undefined, but the structure has corrected...can u suggest me to fix this problem ?

[shriyamparashar]

Was stuck with an issue. Your video helped. Thank you man.

[thiagobarcelos]

Morning man, thanks for this video! Help me understand the when we need to use "?" on my code.

[samiarahman]

Uncaught TypeError: Cannot read properties of undefined (reading 'filter')

can you please help me to fix this.

[mehdi]

Thankyou bro that was so helpful for me

[chandrashekharsahu]

PLEASE HELP

App.js:20
TypeError: Cannot read properties of undefined (reading 'params')

import React, {Component} from "react";

export default class Room extends Component {
constructor(props) {
super(props);
this.state = {
votes_to_skip: 2,
guest_can_pause: false,
isHost: false,
};
this.roomCode =
this.getRoomDetails();
}

getRoomDetails() {
fetch("/api/get-room" + "?code=" + this.roomCode)
.then((response) => response.json())
.then((data) => {
this.setState({
votes_to_skip: data.votes_to_skip,
guest_can_pause: data.guest_can_pause,
isHost: data.is_host,
});
});
}

render() {
return (
<div>
<h3>{this.roomCode}</h3>
<p>Votes:
<p>Guest Can Pause:
<p>Host:
</div>
);
}
}

[baidar]

hi i got the same issue could not solve it for past couple of days. here is my code for "Place order "button
const PlaceOrderScreen = {
after_render: async () => {

.addEventListener('click', async () => {

const order = convertCartToOrder();

showLoading();
const data = await createOrder(order);

hideLoading();
if (data.error)
{
showMessage(data.error);
} else {
cleanCart();
console.log(data);
document.location.hash =`/order/${data.order._id}`;

}
});

},

i am getting type error message when i am using it basically says the _id doesnt exist, while using console.log(data) i can see that _id exists. please help

[crashphantom]

Pff right now am trying to fix the same, i'm not a web developer but i thought that the problem were in the data that is getting in the fetch.

[chembetikarunakar]

Type error can not read properties of undefined (reading 'message')

[The_Shubham_Soni]

Uncaught TypeError: Cannot read properties of null (reading 'reduce')

[Twosf]

First of all how did you even get to the screen you started the video on. Didnt help a person that needs step by step.

[amishaarora]

Thankyou so much. I changed my code from location.search to location?.search. and my login page is rendering now. Thanks again for doing the good work and helping.