How to convert JSON to CREATE TABLE command?

Question

PostgreSQL

The task is this: there is a JSON with a table structure, for example {"name":"tab1", "col":[{"name": "id", "type": "serial"},{"name": ... , "type": ...}]}. There are related tables (parent.id -> child.parent_id).
You need to convert this to a CREATE TABLE SQL command.
PostgreSQL is planned as a database.
Is there a ready made library for Node.js?