Pagination data firebase in nodejs

I use nodejs to create api and I want to pagination data.

Here is my data:

    "c4ca4238a0b923820dcc509awgaga5849baddclose": {
       "_key": "c4ca4238a0b923820dcc509awgaga5849b",
       "content": "Bla ba bla",
       "create_at": 1492800440,
       "title": "First question"
    }

I update _key to can use startAt, but not want show it on parram like: '?key=blabla', expectations is '?page=2&limit=10'

Someone can help me ?

via Vu Le Hoang