Iterate thru json fetch

I have a new wall I’m against.

I thought I got how it worked for running thru an array and giving a random element. But the code gives me an error in console:

TypeError: Cannot read property 'length' of undefined
    at getRandomKanji (kanjitab.js:40)

This is the code I’m trying to recreate the commented part of the code but for my json array.

var myfetch = fetch("https://kanjialive-api.p.rapidapi.com/api/public/kanji/all", {
	"method": "GET",
	"headers": {
		"x-rapidapi-host": "",
		"x-rapidapi-key": ""
	}
})


var i, x = "";

/** Parse response object
 * returns object parsed from json
 */
const getJsonFromRes = (res) => res.json();


 
/**  Logs some data. 
 * returns undefined
 */
const logData = (data) => console.log(data[2].kanji.character);

/** Ignores its data parameter. Attempts to set an element to an uninitialized variable.
 */
//const accessKanji = (data) => {
//	let chars = data.map(el => el.kanji.character + "<br>").join("");
//	document.getElementById('kanji').innerHTML = chars;
//  }

console.log(x)
// print error to console. returns undefined.
const logError = (err) => console.log(err);

// Example comment for what I want to achieve
  //var myArray = ['January', 'February', 'March']; 
  //var rand = myArray[Math.floor(Math.random() * myArray.length)];
	//console.log(rand);
const getRandomKanji = (data) => {
	let charss = getRandomKanji([Math.floor(Math.random() * data.length)]);
	console.log(charss);
}

myfetch 
  .then(getJsonFromRes) 
  .then(logData) 
  .then(getRandomKanji)
  //.then(accessKanji) 
  .catch(logError);

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