JSON array-like object, add item

Question

I have a JSON file which contains:

[{"id":1,"first_name":"Judith","email":"[email protected]"},
{"id":2,"first_name":"Sarah","email":"[email protected]"},
{"id":3,"first_name":"Dorothy","email":"[email protected]"},
{"id":4,"first_name":"Christine","email":"[email protected]"},
{"id":5,"first_name":"Theresa","email":"[email protected]"},
{"id":6,"first_name":"Rebecca","email":"[email protected]"},
{"id":7,"first_name":"Chris","email":"[email protected]"},
{"id":8,"first_name":"Howard","email":"[email protected]"},
{"id":9,"first_name":"Sara","email":"[email protected]"},
{"id":10,"first_name":"Lois","email":"[email protected]"},
{"id":11,"first_name":"Jeffrey","email":"[email protected]"},
{"id":12,"first_name":"Teresa","email":"[email protected]"},
{"id":13,"first_name":"Susan","email":"[email protected]"},
{"id":14,"first_name":"Richard","email":"[email protected]"},
{"id":15,"first_name":"Ronald","email":"[email protected]"}]

I want to add one more element to it but I can't figure it out how. I have the following node code:

var jsonfile = require('jsonfile');
var util = require('util');

var file = 'data.json';
var jsonObj = {};
jsonfile.readFile(file, function(err, obj) {
    jsonObj = obj;

    new_obj = {"id":16,"first_name":"Florin","email":"[email protected]"};
    //jsonObj.push(new_obj)
    console.log(typeof jsonObj);

    /*jsonfile.writeFile(file, jsonObj, function (err) {
      console.error(err)
    })*/
});

I've tried to use push method, but obviously is not working because it is an object not an array, even if it looks as an array. Which would be a good way to add another row at the end of the object (or array - I'm confused)?

Possible duplicate of Convert String to Array of JSON Objects (Node.js) — Nir Levy
– Nir Levy, Commented Feb 1, 2016 at 21:14

sg.cc · Accepted Answer · 2016-02-01 21:12:42Z

3

I believe you're forgetting to parse JSON. After reading the file, your code should be:

jsonObj = JSON.parse(obj);

instead of straight assignment.

answered Feb 1, 2016 at 21:12

sg.cc

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1 Comment

Florin Pop Over a year ago

undefined:1 [object Object],[object Object],[object Object],[object Object],[object Object ^ SyntaxError: Unexpected token o at Object.parse (native) at /home/florin17/Desktop/Work/Express/server/app.js:10:20 at /home/florin17/Desktop/Work/Express/server/node_modules/jsonfile/index.js:20:5 at fs.js:268:14 at Object.oncomplete (fs.js:107:15)

pratikpawar · Accepted Answer · 2016-02-01 21:35:02Z

1

Declare the variable

 var new_obj = {"id":16,"first_name":"Florin","email":"[email protected]"};

And then use push() as you have done already. Give it a try. It will work only if obj is json object as you mentioned in question.

edited Feb 1, 2016 at 21:35

answered Feb 1, 2016 at 21:27

pratikpawar

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