Field code names are automatically generated for fields when they are first dragged into the form of the Kintone App settings. The field codes can be update through the App's settings. Follow the guide in the Help documents to update the Field codes.

Through the App's settings, let's set:

The app parameter is the same as before, pointing to the App ID of the Kintone App we want to get data from. The query parameter, query=order by recordID asc states to retrieve records from the Kintone App in ascending order of the Record Number value. You can check the Kintone API documents for more details on queries.

Let's attach parameters to the end of the API request endpoint in the fetch request.

const response = await fetch(requestEndpoint+parameters, fetchOptions);
    
app.get('/getData', cors(corsOptions), async (req, res) => {
    const fetchOptions = {
        method: 'GET',
        headers:{
            'X-Cybozu-API-Token':process.env.API_TOKEN
    const parameters = "?app=1&query=order by recordID asc";
    const response = await fetch(requestEndpoint+parameters, fetchOptions);
    const jsonResponse = await response.json();
    res.json(jsonResponse);
    
Since we're collecting a list of records from our Kintone App, let's render the response as a list. Note that Kintone's Get Records API responds the list of records as an array of objects. We'll follow the React document's example on how to handle our array to be rendered as a list in our React App.
The first thing we'll do is update the callRestApi function. Let's remove the stringify statement, since in the code the response is easier to handle as JSON format.

//return JSON.stringify(jsonResponse);
    
const arrayOfLists = jsonResponse.records.map(
    record => <li><b>{record.title.value}</b> written by {record.author.value}</li>
return arrayOfLists;
    
Note here that we are referencing our field values in our records by stating record.title.value (the value of the Title field) and record.author.value (the value of the author field).
The resulting array of lists will be returned to the useEffect hook, which will update the apiResponse state using setApiResponse (we don't need to make any changes to the code here). 
In the return statement of the RenderResult function, let's place {apiResponse} between <ul> elements, so we can render the array of lists.

  return(
          <h1>React App</h1>
          <ul>{apiResponse}</ul>
      </div>
    
Aha...there seems to be a warning about "keys" 🗝️🤔
The react.js documents states the following about keys:
Keys help React identify which items have changed, are added, or are removed. Keys should be given to the elements inside the array to give the elements a stable identity
Basically, we need to assign a unique ID to each list we create. Instead of manually creating these keys though, we'll use the unique IDs stored in our Kintone App. The Record number field in Kintone is an auto-incremented field, unique to each record. In our map function, let's add the key attribute to our li element, and assign the value of the Record number field by stating key={record.recordID.value}.

//return JSON.stringify(jsonResponse);
const arrayOfLists = jsonResponse.records.map(
    record => <li key={record.recordID.value}><b>{record.title.value}</b> written by {record.author.value}</li>
return arrayOfLists;
    
require('dotenv').config();
const express = require('express');
const cors = require('cors');
const fetch = require('node-fetch');
const PORT = 5000;
const app = express();
app.use(cors());
const corsOptions = {
    origin: "http://localhost:3000"
const requestEndpoint = "https://{subdomain}.kintone.com/k/v1/records.json";
app.get('/getData', cors(corsOptions), async (req, res) => {
    const fetchOptions = {
        method: 'GET',
        headers:{
            'X-Cybozu-API-Token':process.env.API_TOKEN
    const parameters = "?app=1&query=order by recordID asc";
    const response = await fetch(requestEndpoint+parameters, fetchOptions);
    const jsonResponse = await response.json();
    res.json(jsonResponse);
app.listen(PORT, () => {
    console.log(`Example app listening at http://localhost:${PORT}`);
    
import React, { useState, useEffect } from 'react';
import ReactDOM from 'react-dom';
const restEndpoint = "http://localhost:5000/getData";
const callRestApi = async () => {
    const response = await fetch(restEndpoint);
    const jsonResponse = await response.json();
    console.log(jsonResponse);
    //return JSON.stringify(jsonResponse);
    const arrayOfLists = jsonResponse.records.map(
      record => <li key={record.recordID.value}><b>{record.title.value}</b> written by {record.author.value}</li>
    return arrayOfLists;
function RenderResult() {
  const [apiResponse, setApiResponse] = useState("*** now loading ***");
  useEffect(() => {
      callRestApi().then(
          result => setApiResponse(result));
  },[]);
  return(
          <h1>React App</h1>
          <ul>{apiResponse}</ul>
ReactDOM.render(
    <RenderResult/>,
    document.querySelector('#root')
    
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