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Retrieve documents

import React, { useEffect } from 'react';
import logo from './logo.svg';
import databaseRef from './firebase/firebaseClient';
import './App.css';

function App() {
  useEffect(() => {
    async function fetchProjects() {
      const snapshot = await databaseRef.child('projects').once('value');
      console.log(snapshot.val());
    }
    fetchProjects();
  });
  return (
    <div className="App">
      <header className="App-header">
        <img src={logo} className="App-logo" alt="logo" />
        
        <p>
          Edit
          <code> src/App.js </code>
          and save to reload.
        </p>
        <a
          className="App-link"
          href="https://reactjs.org"
          target="_blank"
          rel="noopener noreferrer"
        >
          Learn React
        </a>
      </header>
    </div>
  );
}

export default App;

Update document

databaseRef.ref('users/1234').set({
  firstName,
  lastName,
  email,
});

Add document

databaseRef.child('users').push({
  firstName,
  lastName,
  email,
});