Get the smallest story from ReadLang.com for your current language

get_smallest_story.js

await fetch(`https://readlang.com/api/books?language=${lang}&firstLanguage=en&categories=Fiction|Non-Fiction|Conversation|Other&filter[metrics_CEF]=${level}&public=true`, {
    "credentials": "include",
    "headers": {
        "Accept": "application/json, text/javascript, */*; q=0.01",
        "X-Requested-With": "XMLHttpRequest",
    },
    "referrer": "https://readlang.com/ja/library",
    "method": "GET",
    "mode": "cors"
})
    .then(res => res.json())
    .then(books =>
        books.filter(book => !book.userBook?.tags?.includes('completed'))
            .sort((a, b) => a.totalWords - b.totalWords)
            .map(book => `https://readlang.com/library/${book._id}`)[0]
    );