Is it correct to pass json as string

Question

I have doubt is it correct/acceptable technique to pass json as string parameter to the API? Is there any implication while passing json as string variable to the API method?

 

i mean normally json will be like this {"blkHouseNo":"11","streetName":"Beach ROAD","postalCode":"123456","storeyNo":"22","unitNo":"2",} but I want to pass as {"PayLoad":"{\"blkHouseNo\":\"183\",\"streetName\":\"Beach ROAD\",\"postalCode\":\"123456\",\"storeyNo\":\"22\",\"unitNo\":\"2\"}"} is it right way ?

 

Currently Any API's following this approach? just asking for prof for the concept to convey to the higher management