faqPage

// Define the class for your questions and answers here.
// They should be marked up in a consistent manner.
var parentClass   = 'faq_block'
var questionClass = 'faq_question';
var answerClass   = 'faq_answer';

// Output schema to console. Set to `false` if adding via tag manager.
var logOutput     = true;

(function(){

    var parent = document.querySelector('.' + parentClass.replace('.', ''))

    // Build Data
    var questions = Array.from(parent.querySelectorAll('.' + questionClass.replace('.', ''))).map(function(e){return e.textContent});
    var answers = Array.from(parent.querySelectorAll('.' + answerClass.replace('.', ''))).map(function(e){return e.textContent});

    if (questions.length && answers.length){

        var data = {
          "@context": "https://schema.org",
          "@type": "FAQPage",
          "mainEntity": []
        };

        buildItem = (q,a) => {

            var item = {
                "@type": "Question",
                "name": null ,
                "acceptedAnswer": {
                  "@type": "Answer",
                  "text":null }
                };

            item['name'] = q;
            item['acceptedAnswer']['text'] = a;

            return item;
        }

        console.assert(questions.length == answers.length, {questions: questions.length, answers: answers.length, errorMsg: "Questions and Answers are not the same lengths"});

        data['mainEntity'] = questions.map(function(q,i){return buildItem(q,answers[i])});

        var script = document.createElement('script');
        script.type = "application/ld+json";
        script.innerHTML = JSON.stringify(data);
        document.getElementsByTagName('head')[0].appendChild(script);

        if (logOutput){
            console.log(script.outerHTML);
        }

    }

})(document);