javascript - 如何使用 fs 在 node.js express 上正确地将数组写入文件？

Question

我正在尝试使用 node.js 和 i've used angular to achive this, you can inspect rest of the code from this question. 在文件中写入一个数组

当我发送一个数组时，文件看起来像这样:[object Object],...

当我在 JSON.stringify(myArr) 中发送我的数组时，它会正确写入文件，但数据会损坏并转换为对象。

json:

[{
  "name"    : "BigTitleLine1",
  "content" : "APP TITLE 1"
}, {
  "name"    : "BigTitleLine2",
  "content" : "APP TITLE 2"
}];

node.js:

var express     = require('express'),
    fs          = require('fs'),
    bodyParser  = require('body-parser'),
    app         = express();

app.use(express.static(__dirname));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.put('/update', function (req, res) {

  console.log(req.body);
  fs.writeFile("./json/test.json", req.body, function(err) {
    res.json({ success: true });
  });
  // this returns true data on console 
  // but it writes [object Object],[object Object] to the file

  var jsonData = JSON.stringify(req.body);
  console.log(jsonData);
  fs.writeFile("./json/test.json", jsonData, function(err) {
    res.json({ success: true });
  });
  // this way writes well but
  // it corrupts data and convert it to object:
  //{"0":{"name":"BigTitleLine1","content":"APP TITLE 1"},"1":{"name":...}}
});

var server = app.listen(3000);

我正在尝试在文件中写入数组。

Answer 1

这应该可以正常工作:

var express     = require('express'),
    fs          = require('fs'),
    bodyParser  = require('body-parser'),
    app         = express();

app.use(express.static(__dirname));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.put('/update', function (req, res) {
  // convert object to array
  var arr = []
  for (var index in req.body){
    arr.push(req.body[index])
  }
  var jsonData = JSON.stringify(arr, null, 2);
  console.log(jsonData);
  fs.writeFile("./json/test.json", jsonData, function(err) {
    res.json({ success: true });
  });
});

var server = app.listen(3000);