This can be done using :
jsondecode('string text');
For more reference:
Sample program:
myStruct=struct();
myStruct.name="Hello";
myStruct.age="21";
myStructString=jsonencode(myStruct);
fprintf("Original structure: \n");
disp(myStruct);
fprintf("Original structure converted to string: \n");
disp(myStructString);
myStruct2=struct();
myStruct2=jsondecode(myStructString);
fprintf("\n\nOriginal structure parsed back from string: \n");
disp(myStruct2);
Output: