Question: How to create APIs like ServiceNow ?

I was reading REST API documentation on ServiceNow. They have Table API to perform CRUD Operations on database- Table API
They have created it so nice that we just need to pass the name of table in query params to get the data.
example:
GET/now/table/{tableName}

Similarly they have created this for other operations like GetbyId, Create, Update, Delete.

I was thinking , how this kind of common crud operations can be done in NodeJS using Express and sequelize?
How should I start for this? your guidance is appreciated.