How to count the number of of children for a parent in the new firebase version 9 using numChildren()?

This is how it is done in firebase version 8 below

firebase.database().ref('users/'   userId).on('value', (snapData) => {
      console.log(snapData.numChildren())
    })

But in version 9 this isn't working below

   onValue(ref(db, 'users/'), (snapData) => {
      console.log(snapData.numChildren())
    })

Does anyone know how it is done in firebase version 9 numChildren()?

CodePudding user response：

There is no numChildren anymore in v9, but you can get the same value with"

onValue(ref(db, 'users/'), (snapData) => {
  console.log(Object.keys(snapData.val()).length) //