Check if array contains string in node.js

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Node.js

I try to write a code that will create a file with an amount of unique random jokes using this npm and Environment Variables in an env file. I get a file with random jokes but I can't filter them to be unique.

here is my code:

let oneLinerJoke = require("one-liner-joke");
require("dotenv").config();
let fs = require("fs");
var getRandomJokeWithTag = oneLinerJoke.getRandomJokeWithTag(
  `${process.env.JOKE_SUBJECT}`
);

let arrayJokes = [];
let i = 0;
let counter = 0;
let amount = parseInt(`${process.env.JOKE_AMOUNT}`);
while (i < amount) {
  let joke = oneLinerJoke.getRandomJokeWithTag(process.env.JOKE_SUBJECT);
  if (!arrayJokes.includes(joke.body)) {
    arrayJokes.push(joke.body + "\n");
    i++;
  }
}
const createFile = fs.writeFile("/created_files/jokes.txt",
  arrayJokes.toString().replace(/,/g, ""),(err) => {
    if (err) throw err;
    console.log("The file has been saved!");
  }
);

What I have tried:

I tried in my code using includes but it doesn't seem to work