[提交数据Express时追加多个JSON条目-电脑我帮您

[提交数据Express时追加多个JSON条目

目标：

当我提交JSON数据时，无论我提交多少条目，我都希望数据到达JSON文件时能正确格式化。

问题：

到目前为止，当我提交数据时，它没有正确地附加到JSON文件中；例如，它像这样追加：

{
 "name": "Jay Money",
 "photo": "/photo/url",
 "scores": [
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5"
 ]
}{
 "name": "Jay Money",
 "photo": "/photo/url",
 "scores": [
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5"
 ]
}

我希望在我追加提交时看起来像这样：

[{
 "name": "Jay Money",
 "photo": "/photo/url",
 "scores": [
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5"
 ]
},
{
 "name": "Jay Money",
 "photo": "/photo/url",
 "scores": [
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5",
   "5"
 ]
}]

我仍在研究，但没有运气，我只是在寻找指导。

这是我的server.js文件的样子：

// Dependencies
let express = require("express");
let bodyParser = require("body-parser");
let path = require("path");
let fs = require("fs");
// Set the port of our application
// process.env.PORT lets the port be set by Heroku
let PORT = process.env.PORT || 4000;
// Create express app instance.
let app = express();
app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());
// Routes
// TODO Add your routes here
app.get('/', function(req,res){
   res.sendFile('home.html', {root : __dirname + '/app/public'});
});
app.get('/survey', function(req, res){
   res.sendFile('survey.html',{root : __dirname + '/app/public'} )
});
app.post('/surveyResponse', function(req,res){
   let photo = req.body.url;
   let name = req.body.name;
   let travel = req.body.travel;
   let affection = req.body.affection;
   let family = req.body.family;
   let fitness = req.body.fitness;
   let movie = req.body.movie;
   let education = req.body.education;
   let career = req.body.career;
   let marriage = req.body.marriage;
   let children = req.body.children;
   let pets = req.body.pets;
   let sum = 0;
   let person = {
       name: name,
       photo: photo,
       scores: [
           travel,
           affection,
           family,
           fitness,
           movie,
           education,
           career,
           marriage,
           children,
           pets
       ]
   }
   let data = JSON.stringify(person, null ,2);
   fs.appendFileSync('./app/data/friends.json', data);
//finding the sum of all the numbers
   for(i in person.scores){
       sum+=Number(person.scores[i]);
   }
//------------------------------------
   res.send('Your name is ' + name + ' and your score is ' + sum );
});
// Start our server so that it can begin listening to client requests.
app.listen(PORT, function() {
 // Log (server-side) when our server has started
 console.log("Server listening on: http://localhost:" + PORT);
});

这是我用来附加的代码：

let data = JSON.stringify(person, null ,2);
fs.appendFileSync('./app/data/friends.json', data);

编辑：

我知道How to append JSON data to existing JSON file node.js，它不能解决我的问题。当我尝试将代码合并到我的代码中时：

var data = fs.readFileSync('friends.json');
var json = JSON.parse(data);
json.push(...person);

fs.writeFile("friends.json", JSON.stringify(json))

我一直收到以下错误消息：

SyntaxError：JSON输入意外结束

所以我尝试了一个新的变化，该变化从...中删除了json.push，因此它看起来像是json.push(person)。

但是我一直收到相同的错误消息。我假设是因为我的文件为空，这会导致错误。我假设我必须先编写代码，然后再执行下一步。

更新

我发现我觉得自己正处于正确的轨道（Save html-form data in json format in a .json file using node and express with javascript ）上，我似乎无法将其集成到我的代码中。我无法弄清楚为什么总是出现以下错误：

SyntaxError：JSON输入意外结束在JSON.parse（）在fs.readFile（server.js：86：39）在FSReqWrap.readFileAfterClose [完成时]（fs.js：511：3）

这是我正在使用的新代码：

// 1. Read the existing file
    fs.readFile('./app/data/friends.json', (err, data) => {
        if (err && err.code === "ENOENT") {
            // But the file might not yet exist.  If so, just write the object and bail
            return fs.writeFile('./app/data/friends.json', JSON.stringify(person), error => console.error);
        } else if (err) {
            // Some other error
            console.error(err);
        }
        // 2. Otherwise, get its JSON content
        else {
            try {
                const fileData = JSON.parse(data);

                // 3. Append the object you want
                fileData.push(person);

                //4. Write the file back out
                return fs.writeFile('./app/data/friends.json', JSON.stringify(fileData), error => console.error)
            } catch (exception) {
                console.error(exception);
            }
        }
    });

回答如下：

[基本上，我必须重写该函数并创建一个接受所提交信息的newFriend。然后，提交的信息将被推送到当前JSON对象中，然后加入。

       let newFriend = req.body; //STORING INCOMING JSON

       // PUSHING NEW MATCH INTO JSON
       friendsJSON.push(newFriend);
       fs.writeFile(path.join(__dirname + '/../data', 'friends.json'), JSON.stringify(friendsJSON, null, 2), function(err){
           if (err) throw err;
       })