fetch.js

const fs = require('fs');
const {default: axios} = require('axios');
const args = process.argv.slice(2);
const titleSlug = args[0];

axios
  .post('https://leetcode.cn/graphql/', {
    operationName: 'questionData',
    variables: {
      titleSlug
    },
    query:
      'query questionData($titleSlug: String!) {\n  question(titleSlug: $titleSlug) {\n    questionId\n    questionFrontendId\n    categoryTitle\n    boundTopicId\n    title\n    titleSlug\n    content\n    translatedTitle\n    translatedContent\n    isPaidOnly\n    difficulty\n    likes\n    dislikes\n    isLiked\n    similarQuestions\n    contributors {\n      username\n      profileUrl\n      avatarUrl\n      __typename\n    }\n    langToValidPlayground\n    topicTags {\n      name\n      slug\n      translatedName\n      __typename\n    }\n    companyTagStats\n    codeSnippets {\n      lang\n      langSlug\n      code\n      __typename\n    }\n    stats\n    hints\n    solution {\n      id\n      canSeeDetail\n      __typename\n    }\n    status\n    sampleTestCase\n    metaData\n    judgerAvailable\n    judgeType\n    mysqlSchemas\n    enableRunCode\n    envInfo\n    book {\n      id\n      bookName\n      pressName\n      source\n      shortDescription\n      fullDescription\n      bookImgUrl\n      pressImgUrl\n      productUrl\n      __typename\n    }\n    isSubscribed\n    isDailyQuestion\n    dailyRecordStatus\n    editorType\n    ugcQuestionId\n    style\n    exampleTestcases\n    jsonExampleTestcases\n    __typename\n  }\n}\n'
  })
  .then((res) => {
    const {codeSnippets, questionFrontendId, titleSlug} = res.data.data.question;
    const javascriptCode = codeSnippets.find((o) => o.lang === 'JavaScript').code;
    const fileName = `${questionFrontendId}-${titleSlug}.js`;
    fs.writeFileSync(fileName, javascriptCode);
  });