how to handle json and write to a file in node.js

Question

Now I have code like this api call, the social network vk.com:

// Setup
var fs = require('fs');
var VK = require('vksdk');

var vk = new VK({
    'appId': ********,
    'appSecret': '*****************',
    'language': 'ru'
});


vk.oldRequest("photos.get", {
    owner_id: "-28445240",
    album_id: "wall",
    rev: "1",
    extended: "1",
    version: "5.40",
}, function (data) {
    console.log(data);
});

In the console output json. How to write it to a file.

Well, did you try `fs.writeFile(filename, data, [encoding], [callback])` ? — adeneo, Dec 06 '15 at 18:54
http://stackoverflow.com/questions/5726729/how-to-parse-json-using-node-js — wuno, Dec 06 '15 at 18:54

score 0 · Answer 1 · answered Dec 06 '15 at 19:20

0

You need to give JSON.stringify(anyObject) to fs.writeFile in order to save an object to a file, otherwise, you will get the string [object Object] (the result of Object.prototype.toString())

answered Dec 06 '15 at 19:20

axelduch

10,769
2
31
50

score 0 · Answer 2 · answered Dec 06 '15 at 19:22

You need to do two things:

Convert the object to a JSON string with JSON.stringify. You got [object Object] because that's how JS coerces objects to strings.
Write it to a file with fs.writeFile.

var fs = require('fs');
fs.writeFile("data.json", JSON.stringify(data, null, 2), function(err) {
    if(err) { return console.log(err); }
});

how to handle json and write to a file in node.js

2 Answers2