npx create-react-app todoreact

import React,{useState,useEffect} from 'react';
import './App.css';

function App() {
  const [data,setData]=useState([]);
  const [newName,setNewName]=useState([]);
  const getData=()=>{
    fetch('/api'
    ,{
      headers : {
        'Content-Type': 'application/json',
        'Accept': 'application/json'
       }
    }
    )
      .then(function(response){
        return response.json();
      })
      .then(function(myJson) {
        setData(myJson)
      });
  }
  useEffect(()=>{
    getData()
  },[])

  const addItem= async () => {
    const rawResponse = await fetch('/api/add/', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
      },

    body: JSON.stringify({"name": newName})
    });
    const content = await rawResponse;

    console.log(content);
    getData()
  }




  return (
    <div className="App">
     {
       data && data.length>0 && data.map((item)=><p>{item.id}{item.priority}{item.name}<button>raise priority</button></p>)
     }
    <input type='text' value={newName} onChange={(e) => (setNewName(e.target.value))} />
    <button onClick={addItem} >add item</button>
    </div>
  );
}

export default App;