node.js - Upload blobs with metadata, node -

how go uploading blob metadata azure in node? have:

blobservice.createblockblobfromtext(containername, function(error) {      //what go in here?  }); 

i see there link set blob metadata, can't interpret means.

does know if it's possible set blob metadata in node?

try code. creates blob in blob container using createblockblobfromtext method , sets 2 metadata items blob:

var azure = require('azure'); testblobupload('testcontainer'); function testblobupload(containername) {     var blobservice = azure.createblobservice('usedevelopmentstorage=true'); // error occurred @ line      blobservice.createcontainerifnotexists(containername, {publicaccesslevel : 'blob'}, function(error){         if(!error)         {             console.log("container created successfully.");             blobservice.createblockblobfromtext(containername, 'simplefile.txt', 'sample content', {                 metadata: {                     'a': 'a',                     'b': 'b',                 }}, function(error){                 if(!error) {                     console.log("blob created text successfully.");                 } else {                     console.log("error: "+error);                 }             });         }         else         {             console.log("error: "+error);          }     }); }