How do i pull data from google firebase whenever I want?

I want to pull data from a firebase database that i have made, i know that you can get the data when with the .on('value', snapshot =>{...}), but that wont work because i want to pull data whenever i want without being restricted to the.on('value', snapshot =>{...}) "event"(or whatever it is called)

Thanks in advance!

via PointlessCoder