NodeJS - 如何获得 URL 的响应？

Question

我有一个网址。当我在浏览器中访问该地址时，它会显示一个 json 文件。我需要在 NodeJs 中获取那个 json 文件。

我该怎么做？

编辑：这是我当前的代码：

const got = require('got');   

var url = "https://www.instagram.com/p/CFcyO54Hc7k/?__a=1";  

got(url).json().then(result => {     
    console.log(result); 
}).catch(err => {     
    console.log(err); 
});

这是我得到的结果：

Promise { <pending> }
Hint: hit control+c anytime to enter REPL.
RequestError: Unexpected token < in JSON at position 0 in "https://www.instagram.com/accounts/login/?next=/p/CFcyO54Hc7k/%3F__a%3D1"
    at Object.parseBody [as default] (/home/runner/VengefulUltimateSdk/node_modules/got/dist/source/as-promise/parse-body.js:22:15)
    at /home/runner/VengefulUltimateSdk/node_modules/got/dist/source/as-promise/index.js:157:40
    at JSON.parse (<anonymous>)
    at parseJson (/home/runner/VengefulUltimateSdk/node_modules/got/dist/source/index.js:118:35)
    at Object.parseBody [as default] (/home/runner/VengefulUltimateSdk/node_modules/got/dist/source/as-promise/parse-body.js:11:48)
    at /home/runner/VengefulUltimateSdk/node_modules/got/dist/source/as-promise/index.js:157:40
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  name: 'ParseError',
  code: undefined,
  timings: {
    start: 1601274389096,
    socket: 1601274389096,
    lookup: 1601274389106,
    connect: 1601274389117,
    secureConnect: 1601274389128,
    upload: 1601274389128,
    response: 1601274389467,
    end: 1601274389511,
    error: undefined,
    abort: undefined,
    phases: {
      wait: 0,
      dns: 10,
      tcp: 11,
      tls: 11,
      request: 0,
      firstByte: 339,
      download: 44,
      total: 415
    }
  }
}

我的节点版本是12.16.1

Answer 1

如果您想将其作为 json 获取，您可以使用 fetch api (https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API)，然后在 Promise 中您可以将 json 作为 js 代码中的对象读取。

fetch('http://server/file.json').then(resp=>resp.json()).then(data=>{do something with data});

Answer 2

你可以在 NodeJS 中使用 axios。

axios.get('https://someapiendpoint.domain.com/v1/api')
  .then((response) => {
    console.log(response.data);
  });

Answer 3

您可以自己解析 JSON，也可以获取一个用于发出 Http 请求的库，该库会自动为您解析 JSON。 here 有很多库可供选择。我最喜欢的是got()，它可以让你解析JSON，并添加一个简单的.json()，这样你得到的解析值就是一个Javascript对象。

const got = require('got');

got("https://www.instagram.com/p/CFcyO54Hc7k/?__a=1").json().then(result => {
    console.log(result);
}).catch(err => {
    console.log(err);
});

当我使用您的 instagram URL 运行上述代码时，我得到了这个 Javascript 对象：

{
  graphql: {
    shortcode_media: {
      __typename: 'GraphSidecar',
      id: '2404017227651993316',
      shortcode: 'CFcyO54Hc7k',
      dimensions: [Object],
      gating_info: null,
      fact_check_overall_rating: null,
      fact_check_information: null,
      sensitivity_friction_info: null,
      media_overlay_info: null,
      media_preview: null,
      display_url: 'https://scontent-sjc3-1.cdninstagram.com/v/t51.2885-15/e35/119980944_890957481429986_8757958615208227911_n.jpg?_nc_ht=scontent-sjc3-1.cdninstagram.com&_nc_cat=102&_nc_ohc=w7zBW_FdRNgAX9BYknl&_nc_tp=18&oh=11424efc118b55180e4d3302d75181ca&oe=5F99EB23',
      display_resources: [Array],
      is_video: false,
      tracking_token: 'eyJ2ZXJzaW9uIjo1LCJwYXlsb2FkIjp7ImlzX2FuYWx5dGljc190cmFja2VkIjp0cnVlLCJ1dWlkIjoiZGIyMzdkMzgzYWVhNDY5YmI0ZWVkZWI4YzlhZDY0YWUyNDA0MDE3MjI3NjUxOTkzMzE2In0sInNpZ25hdHVyZSI6IiJ9',
      edge_media_to_tagged_user: [Object],
      edge_media_to_caption: [Object],
      caption_is_edited: false,
      has_ranked_comments: false,
      edge_media_to_parent_comment: [Object],
      edge_media_to_hoisted_comment: [Object],
      edge_media_preview_comment: [Object],
      comments_disabled: false,
      commenting_disabled_for_viewer: false,
      taken_at_timestamp: 1600801207,
      edge_media_preview_like: [Object],
      edge_media_to_sponsor_user: [Object],
      location: null,
      viewer_has_liked: false,
      viewer_has_saved: false,
      viewer_has_saved_to_collection: false,
      viewer_in_photo_of_you: false,
      viewer_can_reshare: true,
      owner: [Object],
      is_ad: false,
      edge_web_media_to_related_media: [Object],
      edge_sidecar_to_children: [Object],
      edge_related_profiles: [Object]
    }
  }
}

---

如果您想修改现有代码，那么您可能需要使用JSON.parse()。您必须将现有代码添加到您的问题中，以便我们提供帮助。