How can we Post Three components data(form page) into the database?

Q: How can we Post Three components data(form page data) into the database?

Totally, we have 4 components.

First one is "Loc"

second is "Det"

third one is "Pam"

and 4 th one is "Pub" .

we have to carry the all 3 components data in 4 th component (Pub=Loc+Det+Pam)

and when we click "submit" button in particular "pub" page in browser , total 3 components data will be store in database in

JSON format

{

"loc" : { },

"det" : { },

"pam" : { }

}

by using API (post method)

(Here I confirmed that single component data is storing in database by using API post method with key like==>

{

"loc" : { }

}

but coming to 3 components how it is possible?