how to retrive records using jsom based on retrive data

Greetings,

I have to fetch data using  CAML query based on Json

Requirement:

as i retrieve data, want to pass its lookupfield id ( lookup value ) to fetched data from other list ( parent/Master List ).

Solution Required:

How and where to write 1 caml query to fetch data to pass its lookfield value to retrieve further data.

like in sql we use inner join to retrive data between 2 different tables

Thanks