Convert strings like document.cookie to objects

Question

I have a line similar to document.cookie:

var str = 'foo=bar, baz=quux';

Converting it to an array is very simple:

str = str.split(', ');
for (var i = 0; i < str.length; i++) {
    str[i].split('=');
}

It produces something like this:

[['foo', 'bar'], ['baz', 'quux']]

Converting to an object (which would be more appropriate in this case) is more complicated.

str = JSON.parse('{' + str.replace('=', ':') + '}');

This creates an object that is invalid:

{foo: bar, baz: quux}

I need an object like this:

{'foo': 'bar', 'baz': 'quux'}

Note . I used single quotes in my examples, but when publishing code, if you use JSON.parse(), remember that double quotes are needed for single quotes.

---

Update

Thanks to everyone. Here is the function that I will use (for future use):

function str_obj(str) {
    str = str.split(', ');
    var result = {};
    for (var i = 0; i < str.length; i++) {
        var cur = str[i].split('=');
        result[cur[0]] = cur[1];
    }
    return result;
}

Answer 1

JSON.parse ?

str = str.split(', ');
var result = {};
for (var i = 0; i < str.length; i++) {
    var cur = str[i].split('=');
    result[cur[0]] = cur[1];
}

, .

Answer 2

a, :

[['foo', 'bar'], ['baz', 'quux']]

:

var obj = {};
for (var i = 0; i < a.length; ++i) {
   var tmp = a[i];
   obj[tmp[0]] = tmp[1];
}

Answer 3

, :

var obj = {};
str = str.split(', ');
for (var i = 0; i < str.length; i++) {
    var tmp = str[i].split('=');
    obj[tmp[0]] = tmp[1];
}

, , JSON :

var jsonString = JSON.stringify(obj);

Answer 4

note: document.cookie( ) ()...

reduce:

var str = 'foo=bar; baz=quux';
var obj = str.split(/[;] */).reduce(function(result, pairStr) {
  var arr = pairStr.split('=');
  if (arr.length === 2) { result[arr[0]] = arr[1]; }
  return result;
}, {});

Answer 5

John Resig " " :

var str = 'foo=bar, baz=quux',
    arr = [],
    res = '{';

str.replace(/([^\s,=]+)=([^,]+)(?=,|$)/g, function ($0, key, value) { 
    arr.push('"' + key + '":"' + value + '"');
});

res += arr.join(",") + "}";

alert(res);

: http://jsfiddle.net/cm6MT/.

JSON. , exec() match().

</" > , , JSON, . :

var str = 'foo=bar, baz=quux',
    res = {};

str.replace(/([^\s,=]+)=([^,]+)(?=,|$)/g, function ($0, key, value) { 
    res[key] = value;
});
console.log(res.foo);
//-> "bar"

2: http://jsfiddle.net/cm6MT/1/

Answer 6

, , =

var text = 'foo=bar, baz=quux',
    pattern = new RegExp(/\b([^=,]+)=([^=,]+)\b/g),
    obj = {};

while (match = pattern.exec(text)) obj[match[1]] = match[2];

console.dir(obj);

Answer 7

, / , .

function stringToObject(str, delimiter) {
    var result = {};
    if (str && str.length > 0) {
        str = str.split(delimiter || ',');
        for (var i = 0; i < str.length; i++) {
            var cur = str[i].split('=');
            result[cur[0]] = cur[1];
        }
    }
    return result;
}

Answer 8

cookie (IE9 +):

document.cookie.split('; ').reduce(function(result, v, i, a) { var k = v.split('='); result[k[0]] = k[1]; return result; }, {})