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
– adeneo, Commented Dec 6, 2015 at 18:54

a-d · Accepted Answer · 2015-12-06 19:20:29Z

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 6, 2015 at 19:20

a-d

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Kristján · Accepted Answer · 2015-12-06 19:22:29Z

0

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); }
});

answered Dec 6, 2015 at 19:22

Kristján

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