如何在 Javascript 中从 POST 请求中读取 JSON 值答案

【问题标题】：How to read JSON values from POST Request in Javascript如何在 Javascript 中从 POST 请求中读取 JSON 值
【发布时间】：2018-06-20 02:46:29
【问题描述】：

如何从客户端发送的 POST 请求中读取值？我在 Swift 中从客户端发送POST 请求，如下所示：

    let data = [ "tokenId": "tokenId-12345",
                 "title": "Congrats! You have a new follower.",
                 "body" : " John Doe is now following you.",
                 "photoUrl" : "url" ]

    let body = try! JSONSerialization.data(withJSONObject: data, options: .sortedKeys)
    request.httpBody = body
    URLSession.shared.dataTask(with: request) { (data, response, error) in
        // handle response.
    }

在后端我需要从请求中获取值，所以我可以发送推送通知。

 const functions = require('firebase-functions');
 const admin = require('firebase-admin');
 var serviceAccount = require("./service-account.json");
 admin.initializeApp(functions.config().firebase);

 exports.isMutual = functions.https.onRequest((request, response) => {

    if (request.params) {

        // get values. This doesn't work..
        var title = request.params.title;
        var body = request.params.body;
        var icon = request.params.photoUrl;

        const payload = {
            notification: {
              title:title,
              body: body,
              icon: icon
            }
          };

        response.send(payload);
        console.log(payload);
    }

   });

【问题讨论】：

var title = request.body.title; var body = request.body.body; var icon = request.body.photoUrl; 更多信息：firebase.google.com/docs/functions/…
@Peter 不工作。日志显示：{ notification: { title: undefined, body: undefined, icon: undefined } }。这可能是什么原因？
console.log 与 request.body 是什么关系？
日志显示：{ '{"body":" John Doe is now following you.","photoUrl":"url","title":"Congrats! You have a new follower.","tokenId":"tokenId-12345"}': '' }
哦，我看到整个帖子消息是对象的键。试试这个：var body = JSON.parse(Object.keys(request.body)[0]); console.log(body) - 这是一个丑陋且快速的解决方案，不要在生产中使用它，只是尝试找出正文解析器出了什么问题）

标签： javascript ios json node.js swift

【解决方案1】：

要使用request.query.myKey，请将URLQueryItem's 添加到客户端的url，而不是将字典添加到urlRequest body。

   var urlComponents: URLComponents {
            var components = URLComponents(string: urlString)!
            let tokenIdQueryItem = URLQueryItem(name: "TokenId", value: "tokenId-12345")
            let titleQueryItem = URLQueryItem(name: "title", value: "Congrats! You have a new follower.")
            let bodyQueryItem = URLQueryItem(name: "body", value: "John Doe is now following you")
            let photoUrlQueryItem  = URLQueryItem(name: "photoUrl", value: "photoUrl...")
            components.queryItems = [tokenIdQueryItem, titleQueryItem, bodyQueryItem, photoUrlQueryItem]
            return components
        }

   var request = URLRequest(url: urlComponents.url!)

【讨论】：

【解决方案2】：

使用query

    var title = request.query.title;
    var body = request.query.body;
    var icon = request.query.photoUrl;

另外，删除if (request.params)

做

 if(title && body && icon){ 
     // do something
 }

【讨论】：

不走运。日志：{ notification: { title: undefined, body: undefined, icon: undefined } }。在测试之前我已经删除了if (request.params)。
你能从网络浏览器试试吗？
我不久前做过 Firebase 功能。 github.com/huyvanvo94/university-library-mobile-app/blob/master/…
我最终从彼得那里得到了可行的解决方案。感谢分享！
在客户端你的数据结构和我的一样吗？只是键/值对？