How to get data in react component?

Question

Flask

There is a code in flask:

from flask import Flask, jsonify

app = Flask(__name__)

i = [
    {
        'id': 1,
        'title': 'Hello'
    },
    {
        'id': 2,
        'title': 'World'
    }
]

@app.route('/', methods=['GET'])
def get_task():
    return jsonify({'i': i})

if __name__ == '__main__':
    app.run(debug=True)

with an array that I want to display in the component.
actually in react, I use componentDidMount . But I don’t understand what needs to be written here
and the
server is also wounded on the localhost. In package json I put proxy: port number is
that correct?