upload image into firebase and get image url from firebase in reactJs

// firebase object from your configurable data      

var storageRef = firebase.storage().ref('/images/'+ url.name);

      var uploadTask = storageRef.put(url);

      uploadTask.on('state_changed', function(snapshot){ 

        var progress =  

         (snapshot.bytesTransferred / snapshot.totalBytes) * 100; 

          switch (snapshot.state) { 

            case firebase.storage.TaskState.PAUSED: 

              console.log('Upload is paused'); 

              break; 

            case firebase.storage.TaskState.RUNNING: 

              console.log('Upload is running'); 

              break; 

          } 

      }, function(error) {console.log(error); 

      }, function() { 

           uploadTask.snapshot.ref.getDownloadURL().then( 

            function(downloadURL) { 

            console.log('File available at', downloadURL); 

        }); 

      });