diff --git a/examples/example.js b/examples/example.js
new file mode 100644
index 0000000..df6e95b
--- /dev/null
+++ b/examples/example.js
@@ -0,0 +1,98 @@
+var Client = require('../index');
+
+//firstly you will need to init client, sandbox mode dont work correctly, it returns some encoded strings (you can ask GUS why)
+//
+
+console.log("_________________________________");
+console.log("_________________________________");
+console.log("_________________________________");
+console.log("");
+console.log("If you think that this package is usefull, please make some donation for http://hospicjumtischnera.org/pl/ NIP: 6762264686")
+console.log("");
+console.log("");
+console.log("http://hospicjumtischnera.org/pl/")
+console.log("NIP: 6762264686")
+console.log("");
+console.log("");
+console.log("_________________________________");
+console.log("_________________________________");
+console.log("_________________________________");
+
+gus = Client.createClient({
+    key: "HERE_PUT_YOUR_PRODUCTION_KEY",
+    disableAsync:true, // if it is true, you will get returned result, and it will waid for end of call
+    captcha: {
+      autofill: false,
+      apiKey: "ANTIGATE_API"
+    }
+});
+// AVAILABLE ADDITIONAL OPTIONS:
+// sandbox: false,  - but it don't work for some time, by default is true
+// autoLogin: false, - if you want to run gis.login(), by yourself
+// sid:"YOUR SESS ID", - if you want to pass your session id
+// captcha: {
+//   autofill: true,
+//   apiKey: "YOUR_ANTIGATE_API_KEY"
+// }
+// if you want to auto resolve captchas.
+
+
+console.log("login GUS sessionID: ", gus.getSessionId());
+
+// If you want to get basic information about NIP, lets:
+var findCompanyByNip = gus.findByNip("6762264686");
+console.log(findCompanyByNip);
+
+
+// If you want to get full report by REGON:
+var companyRegon = findCompanyByNip.response.Regon; // get regon from previous query
+var fullReport = gus.getFullReport(companyRegon);
+
+console.log(companyRegon, fullReport);
+
+
+// You can also:
+// gus.findByMultiRegon([
+//   "NIP",
+//   "NIP2"
+// ]);
+// gus.findByRegony9zn([
+//   "NIP_9chars",
+//   "NIP_9chars"
+// ]);
+// gus.findByRegony14zn([
+//   "NIP_14chars",
+//   "NIP_14chars"
+// ]);
+
+
+//You can use search
+// You need to specify correct search params, one or many of: Krs, Krsy, Nip, Nipy, Regon, Regony14zn, Regony9zn
+// checkout GUS API
+console.log("SEARCH", gus.search({
+	"Nip": "6762264686"
+}));
+
+//You can logout:
+// gus.logout();
+
+
+
+
+//You can get info about session if exists (checkout documentation of GUS API):
+console.log("getInfo", gus.getInfo());
+
+//You can get value:
+console.log("getValue StatusSesji", gus.getValue("StatusSesji"));
+console.log("getValue KomunikatKod", gus.getValue("KomunikatKod"));
+console.log("getValue KomunikatTresc", gus.getValue("KomunikatTresc"));
+
+
+//You can get captcha if exist, and for example show it to Your client to fill
+// it is base64 image, checkout GUS API documentation
+console.log("getCaptcha", gus.getCaptcha());
+
+// You can send captcha result, and if it will be correct, get captcha wont show for this session
+console.log("checkCaptcha", gus.checkCaptcha("123452"));
+console.log("getCaptcha", gus.getCaptcha());
+
diff --git a/lib/service.js b/lib/service.js
index 0a883eb..8a721f4 100644
--- a/lib/service.js
+++ b/lib/service.js
@@ -70,6 +70,9 @@ var Service = function(options, callback) {
     if (!result.error)
       this.sid = result.response.ZalogujResult;
 
+    if(!result.response.ZalogujResult)
+      throw "Problem with login. Please check if you entered correct api key, and if sandbox is defined correctly.";
+
     return result;
   };
   this.Zaloguj = this.login;
@@ -236,7 +239,6 @@ var Service = function(options, callback) {
         result.response = json;
         return result;
       }
-
       var json = xml2json.toJson(firstObject);
       json = JSON.parse(json);
 
diff --git a/package.json b/package.json
index 3a391c6..266e1b0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "node-regon",
-  "version": "0.1.42",
+  "version": "0.1.43",
   "description": "An API for accessing a Polish REGON database",
   "main": "index.js",
   "scripts": {