memrise-export.js

// https://www.memrise.com/course/199109/250-most-important-adjectives-japanese/

(() => {

    function getWords(courseId, level) {
        const url = `https://www.memrise.com/ajax/session/?course_id=${courseId}&level_index=${level}&session_slug=preview`
        // console.log('Fetching words from ' + url)

        return fetch(url, {
                credentials: 'same-origin'
            })
            // parse response
            .then(res => {
                return res.status === 200 ?
                    res.json()
                    // map results
                    .then(data => {
                        // console.log(data.learnables)

                        let array = [];
                        for (let item of data.learnables) {
                            // console.log(item);
                            let kana = item.item.value
                            let english = item.definition.value
                            let kanji = item.confused_answers[0] ? item.confused_answers[0].value : "";

                            if(kanji != "") {
                                array.push(kanji + "\n\n(" + kana + ");;;" + english + ";;;;");
                            } else {
                                array.push(kana + ";;;" + english + ";;;;");
                            }
                        }
                        
                        return array.join("");
                    }) :
                    []
            })
            .catch(err => {
                console.error(err)
                return []
            })
    }

    // fetch
    const start = 1
    const courseId = location.href.slice(30).match(/\d+/)[0]
    let final = "";
    getWords(courseId, 1)
        .then(words => {
            final = final + words;
            return getWords(courseId, 2)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 3)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 4)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 5)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 6)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 7)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 8)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 9)
        })
        .then(words => {
            final = final + words;
            return getWords(courseId, 10)
        })
        .then(words => {
            final = final + words;
            console.log(final);
        })

})()