Why am I getting a blank screen while following React JS? - reactjs

Question

I am following the current tutorial:
Youtube tutorial at 12:51 mins.
I expect to see bunch of posts on my screen but my screen remains blank.
It appears I have followed everything told in the tutorial.
import React, { Component } from 'react';
class Posts extends Component {
constructor(props) {
super(props);
this.state = {
posts: []
}
}
componentWillMount() {
fetch('https://jsonplaceholder.typicode.posts')
.then(res => res.json())
.then(data => this.setState({posts: data}))
}
render() {
const postItems = this.state.posts.map(post => (
<div key={post.id}>
<h3>{post.title}</h3>
<p>{post.body}</p>
</div>
));
return (
<div>
<h1>Posts</h1>
{ postItems }
</div>
);
}
}
export default Posts;
and
import React, { Component } from 'react';
import './App.css';
import Posts from './components/Posts'
class App extends Component {
render() {
return (
<div className="App">
<Posts />
</div>
);
}
}
export default App;
My browser screen remains blank and I do not see any errors on console.
What am I missing ?

Answer 1

Don't know about the tutorial but it looks outdated...
Here is your App.js (parent component):
import React, { Component } from 'react';
import Posts from './Posts';
export default class App extends Component {
state = { posts: [] };
//fetch the posts and store them in the state
componentDidMount() {
fetch('https://jsonplaceholder.typicode.com/posts')
.then(response => response.json())
.then(posts => this.setState({ posts }))
.catch(error => console.log(error));
}
render() {
return (
<div>
{/* pass the state (posts) as props to Posts */}
<Posts posts={this.state.posts} />
</div>
);
}
}
Here is your Posts.js:
import React from 'react';
// No need for a class based comp
// destructure the props and you have all your data
const Posts = ({ posts }) => (
<div>
{posts.map(post => (
<div key={post.id}>
<h3>{post.title}</h3>
<p>{post.body}</p>
<hr />
</div>
))}
</div>
);
export default Posts;
Live Demo: https://jsfiddle.net/ctszdue9/7/

Answer 2

Try putting side effect/ api call inside
componentDidMount() { }
Change URL
https://jsonplaceholder.typicode.posts/
TO
https://jsonplaceholder.typicode.com/posts