How to convert coma separate string into json array

Question

Hi i have string like "12,23,45" from database now i have to convert that into json array to send in webapi parameter but when i convert that into array i got result like

 

i have string like "12,23,54" in my database  

 

 

  my result:   ["\"93\",\"94\""]

 

but i need like :   ["93","94"]

 

Please help