Write json object to .json file in JavaScript

Question

var proj = {
    Name : "abc",
    Roll no : 123
};

How can I write proj data in JSON format in .json file in javascript?

JSON.stringify(proj) to convert it from Javascript to JSON. It would be worth going through a JSON basics course to teach yourself how to create JSON from scratch though, this is a very basic question. — James Gould
– James Gould, Commented Jul 17, 2017 at 16:09
You've got 2, identical and working, answers that have solved your problem. — James Gould
– James Gould, Commented Jul 17, 2017 at 16:27

Community · Accepted Answer · 2021-01-28 10:16:14Z

19

You can save the json object in file.json file like this.

const FileSystem = require("fs");
 FileSystem.writeFile('file.json', JSON.stringify(proj), (error) => {
    if (error) throw error;
  });

edited Jan 28, 2021 at 10:16

CommunityBot

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answered Dec 2, 2019 at 9:34

Knight Apu

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1 Comment

Valu3 Over a year ago

Should be (err) => { if (err) throw err; }

Quentin · Accepted Answer · 2017-07-17 16:09:06Z

13

JSON.stringify (introduced in ES 5.1) will convert the object into a string of JSON.

var json = JSON.stringify(proj);

JavaScript has no built-in mechanism for writing to a file. You generally need something non-standard provided by the host environment. For example, Node.js has the writeFile method of the File System module.

answered Jul 17, 2017 at 16:09

Quentin

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Comments

nstot · Accepted Answer · 2022-03-23 13:56:05Z

0

Pretty much the same as top answer but slightly simpler version I regularly use to help with debugging (prints out an object at a given point in the code without using a debugger):

require('fs').writeFile('file.json', JSON.stringify(proj), (error) => {
        if (error) {
            throw error;
        }
    });

answered Mar 23, 2022 at 13:56

nstot

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Comments

Jon Diamond · Accepted Answer · 2023-10-01 23:29:53Z

0

One way to get a file in a browser with JS is using a dataUri:

var dataUri = "data:application/json;charset=utf-8;base64," + btoa(JSON.stringify(proj));

<a download="proj.json" href=dataUri>proj.json</a>

cheers,

jD

answered Oct 1, 2023 at 23:29

Jon Diamond

1

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