node js: access json if variable name in string?

Question

I have json object as following

var data = { 
   datetime:{
     time:"9:30 AM",
     date:"24-09-2017"
   }
}

and i have string var element = "data.datetime.time" how to access the time using element .

Answer 1

Split the string (dot as separator), and use Array#reduce to extract the data from the object:

 var data = { datetime:{ time:"9:30 AM", date:"24-09-2017" } } var element = "data.datetime.time"; var result = element.split('.').reduce(function(r, p) { return typeof r === 'object' ? r[p] : null; // if r is an object, return the prop value, if not return null }, { data: data }); console.log(result); 

Answer 2

new Function(`return ${element}`)()

Answer 3

I have just found the answer for this..

simply we can use eval()

var data = {    
      datetime:{
        time:"9:30 AM",
         date:"24-09-2017"    
      } 
   }

var element = "data.datetime.time";

console.log(eval(element));