retrieve entry data per post id

Post.js

import React from 'react';
import { createClient } from 'contentful';

class Post extends React.Component {
  constructor(props) {
    super(props);

    this.state = {
      data: null
    };
  }

  componentWillMount() {
    const client = createClient({
      space: process.env.REACT_APP_SPACE_ID,
      accessToken: process.env.REACT_APP_ACCESS_TOKEN
    });

    client
      .getEntry(this.props.match.params.id)
      .then(response => {
        this.setState({
          data: response.fields
        });
      })
      .catch(console.error);
  }

  render() {
    console.log(this.state.data);
    return <p>Post</p>;
  }
}

export default Post;