Convert object's properties and values to array of key value pairs

Question

I'm fairly new to JavaScript and am not sure this is possible to do but basically I would like to take an object and convert it into an array of strings in the format; array[0] = 'prop1=value1'

The reasoning behind this is that I'm having a user enter a list of k=v pairs into a form, later it's written as an object within a json blob. Going from the key value csl to the json object was simple, now I need to go back the other way (I've received the JSON via an ajax call and want to populate a blank form). Is this possible in JavaScript? If not please offer a reasonable work around.

Sample code;

Object in debugger;

 Object
        private_key: "private-key"
        public_key: "public-key"

I need to convert that to;

 "private_key=private-key,public_key=public-key"

Basically I need something like this (pseudo code)

var outputString = '';
foreach (prop in obj)
{
    outputString = outputString + prop.tostring() + '=' + prop.value + ',';
}

Answer 1

You're probably looking for something along the lines of

var obj = {value1: 'prop1', value2: 'prop2', value3: 'prop3'};
var arr = [];
for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
        arr.push(key + '=' + obj[key]);
    }
};
var result = arr.join(',');
alert(result);

Notice that it will work fine if your values are strings; if they're complex objects then you'll need to add more code.

Or you can just use jQuery.param , which does what you want, even for complex types (although it uses the & character as the separator, instead of the comma.

Answer 2

In ES6 you can use Object.entries({object1:1,object2:2}); . The result is: [["object1",1],["object2",2]]

Answer 3

var array = [];
for (k in o)
{
    if (o.hasOwnProperty(k))
    {
        array.push(k+"="+o[k]);
    }
}

You can then join the array for your final string.

Answer 4

var object = {
    private_key: "private-key",
    public_key: "public-key"
};

var array = [];
for (var prop in object)
    array.push(prop + "=" + object[prop]);
return array.join(','); // "private_key=private-key,public_key=public-key"

Notice the order is not guaranteed.

Answer 5

 obj = { private_key: "private-key", public_key: "public-key" } str = JSON.stringify(obj).replace(/[{}]/g, '').replace(/"/g, '').replace(/:/g, '='); console.log("Using JSON.stringify:\\n", str); str = Object.keys(obj).map((key) => `${key}=${obj[key]}`).join(',') console.log("Using ES6 keys/map:\\n", str); str = jQuery.param(obj).replace(/&/g,','); console.log("Using jQuery.param:\\n", str);

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer 6

var obj =[
            {'2018-05-07':1},
            {'2018-05-08':3},
            {'2018-05-09':2}
        ];

        for(var i of obj) {
            var key = Object.keys(i).toString();
            console.log(i,'=',i[key]);
        }

Result

:

Answer 7

1-liner:

Object.entries(yourObj).map(e => ({ name: e[0], value: e[1] }));

Example use:

let yourObj = { foo: "bar", baz: "bas" };

// turn object properties into array entries
let array = Object.entries(yourObj).map(e => ({ name: e[0], value: e[1] }));

// returns
array = [
  { name: "foo", value: "bar" },
  { name: "baz", value: "bas" },
]
// loop over it
for (let prop of array) {
  console.log(prop.name, "=", prop.value);
}
// shows
foo = bar
baz = bas

Alternatively, create string in the format you wanted:

Object.entries(yourObj).map(e => e[0] + "=" + e[1]).join(",");
"foo=bar,baz=bas"