How to replace string values with numeric inside a json object used in google visualization api column chart

Question

I have this Json string that i use for google chart visualization that needs to be in this exact format and i need to replace every value of "v" that is a number to its numeric value( the value without the ""). I should do some javascript replace function, but i couldn't find a way to move around the json object. Here is and example json string that i should modify :

{"cols":[
{"id":"r","label":"Reason","type":"string"},
{"id":"m","label":"Minutes","type":"number"}
],
"rows":[
{"c":[
     {"v":"Flour - Blower","f":"Flour - Blower"},
     {"v":"7","f":"7"}]},
{"c":[
     {"v":"Whole Line - d","f":"Whole Line - d"},
     {"v":"4","f":"4"}]},
{"c":[
     {"v":"Flour - Pipework","f":"Flour - Pipework"},
     {"v":"3","f":"3"}]},
{"c":[
     {"v":"Horseshoe - Belt","f":"Horseshoe - Belt"},
     {"v":"1","f":"1"}]}
],
"p":null
}

probably i should do something like :

var jsonStr = ...;

for (i in jsonStr.rows) {
   for(j in jsonStr[i].c)
   { 
    if (parseInt(jsonStr[i].c[j].v) != 'NaN') {
        jsonStr.rows[i].c[j].v = parseInt(jsonStr.rows[i].c[j].v);
   }
 }

Answer 1

Since JSON is effectively a string, why not put the entire string through a global string.replace:

jsonStr = JSON.stringify(jsonStr);
jsonStr = jsonStr.replace(/"v":"(\d+)"/g, '"v":$1');

Jsfiddle demo