How to set class and export correctly in javascript and Node.js

Question

I use node.js and I loaded js file in ejs

When main.js will be loaded,script will be functioned. while then,

    <script type="text/javascript" src=../javascripts/functions.js></script>
    <script type="text/javascript" src=../javascripts/quiz.js></script>
    <script type="text/javascript" src=../javascripts/main.js></script>

I have some issues like Uncaught ReferenceError: module is not defined in quiz.js

How to set export correctly?

I'd like to export quiz class correctly. Is this issue comes from ES6 ?

If someone has opinion,please let me know.

Thanks

quiz.js

class Quiz {
  
    constructor(quizData){
        this._quizzes = quizData.results;
        this._correctAnswersNum = 0;
    }
 
    getQuestion(index){
        return this._quizzes[index-1].question;
    }
    
}

module.exports = Quiz;

main.js

(()=>{
      const url = "/quiz-data";

      fetch(url)
      .then(response => response.json())
      .then(json => {
        const quiz = new Quiz(json);
        console.log("json",json);
        console.log("quiz",quiz);
        displayQuiz(quiz,1);
      });
})();

Answer 1

Client-side JS does not support Node.js style CommonJS modules .

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If you want to use modules client-side, then write ES6 modules .

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If you just want to use shared globals, then write the code as you have it now only without the module.exports line.