src/App.js

import React from 'react';
import ReactFlow from 'reactflow';

import 'reactflow/dist/style.css';

const initialNodes = [
  {
    id: '1',
    type: 'input',
    data: { label: 'Hello' },
    position: { x: 250, y: 0 },
  },
  {
    id: '2',
    data: { label: 'World' },
    position: { x: 250, y: 100 },
  },
];

const initialEdges = [{ id: 'e1-2', source: '1', target: '2' }];

const App = () => {
  return (
    <div style={{ width: '100%', height: '500px' }}>
      <ReactFlow nodes={initialNodes} edges={initialEdges} />
    </div>
  );
};

export default App;