How to convert a javascript map of array into a json object in javascript?

Question

I have a javascript MAP object which is holding key as a string and value as a javascript array, each array is holding set of strings inside it. I want to convert the map of arrays into a json object in javascript.

Here is the code which i tried

function addRole() {

 var jsonObjectOfMap={};
    subMenuSelectedIdMap.forEach(function(items,key,subMenuSelectedIdMap){
        jsonObjectOfMap[key]=JSON.stringify(items);
    }); 
    alert(JSON.stringify(jsonObjectOfMap));

I am getting the json object as like this {"1004":"[1005,1006,1023]","1007":"[1008,1053]"}

But is this json format object is valid and what i have to do if i want it the format as this: {"1004":["1005","1006","1023"]","1007":["1008","1053"]}

Please help me out

jsonObjectOfMap[key]=items; – JSON.stringify() doesn't need to be called on each individual object. It's usually only necessary to call it once on the root object – JSON.stringify(jsonObjectOfMap). It already behaves recursively and will stringify any (compatible) values contained within. — Jonathan Lonowski
– Jonathan Lonowski, Commented Dec 8, 2016 at 5:06
I tried that way but its giving me like this : {"1004":[1005,1006,1023],"1007":[1008,1053]} — zameer
– zameer, Commented Dec 8, 2016 at 5:30

Jonathan Lonowski · Accepted Answer · 2016-12-08 05:46:26Z

0

If the inner-most values are all numbers and you want them as strings in the end result, you'll have to convert each number individually to a string.

You can do that with another loop over each items using .map() and either calling String() or .toString() for each number:

subMenuSelectedIdMap.forEach(function (items, key, subMenuSelectedIdMap){
    jsonObjectOfMap[key] = items.map(function (item) {
        return String(item); // or `return item.toString();`
    });
});

Optionally, since String() only acknowledges one argument (with the other two that .map() passes being ignored), the loop over items could be shortened to:

jsonObjectOfMap[key] = items.map(String);

edited Dec 8, 2016 at 5:46

answered Dec 8, 2016 at 5:39

Jonathan Lonowski

124k35 gold badges203 silver badges202 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to convert a javascript map of array into a json object in javascript?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related