I have following database hierarchy in my Firebase application.
I know about query parameters in REST API, but how can I get group1 and group2 by single http request?
The only way to get multiple nodes in a REST request is by having a query that matches the nodes you are looking for. Since Firebase Database queries don't have a
WHERE key IN (a,b,c) type operation, the query will have to match some property value/range.
In your specific example you could order by key and limit to the first 2 results:
But in general if you want to retrieve a set of N children through the Firebase API, it will require N calls.