Use SOAP module on NodeJS to consume salesforce WSDL

NodeJS SOAP modulo with SF

function test(callback){
soap.createClient('./partner.wsdl', function(err, client) {
	console.log('\t\tLogging in on Salesforce...');
		client.login({username: C.SF.Username,password: C.SF.Password},function(err,result,raw){
      		console.log('\t\tDone.');

   			if(err){
		    	console.log(error);
    			return callback(error);
		    }

			var sheader = {SessionHeader:{sessionId: result.result.sessionId}};
			client.addSoapHeader(sheader,"","tns","");
		    client.setEndpoint(result.result.serverUrl);
		    console.log('\t\tQuerying attachment...');
		    client.query({queryString:'Select id,name,body,contentType From Attachment limit 1'},function(err,result2,raw){
		    	console.log('\t\tDone.');
			    if(err){
			      console.log(error);
    				return callback(error);
			    }
			    if(result2){
			      //console.log(result2.result.records[0]);
			      return callback(null,result2);
			    }
			});
		 });
	});
}