This is an example for Geofire and Firebase

sample_geo_fire_and_firebase.js

const { user, profiles } = this.state
    const swipedProfiles = await this.getSwiped(uid)
    const geoFireRef = new GeoFire(firebase.database().ref('geoData'))
    const userLocation = [user.geolocation.latitude, user.geolocation.longitude]
    const geoQuery = geoFireRef.query({
      center: userLocation,
      radius: distance
    })
    geoQuery.on('key_entered', async (uid, location, distance) => {
      log(uid + ' at ' + location + ' is ' + distance + 'km from the center')
      const user = await FirebaseUsers.getOnce(null, uid)

      let isExist = false
      profiles.each((profile) => {
        if (profile.uid === user.uid) isExist = true
      })

      if (isExist) return

      const profiles = [...this.state.profiles, user.val()]
      const filtered = SearchFilter(profiles, this.state.user, swipedProfiles) || []
      this.setState({ profiles: filtered, isEmpty: filtered.length === 0 })
    })