diff --git a/lib/translate-json-object.js b/lib/translate-json-object.js
index f4eea46..6bc8fe1 100644
--- a/lib/translate-json-object.js
+++ b/lib/translate-json-object.js
@@ -1,5 +1,7 @@
 var _ = require('lodash');
 var Promise = require('promise');
+var constant = require('./util/constant');
+var isValidLang = require('./util/valid-lang');
 
 var MISSING_TOKEN_ERROR_MESSAGE = 'Please provide a option.googleApiKey, or option.yandexApiKey (token key) via invoking the [init] method';
 
@@ -15,6 +17,7 @@ function TranslateJSONObject() {
 	// The list of promises that should be resolve prior to returning the full `Object translation`
 	var promises = [];
 	var destObj = {};
+	var serviceType;
 
 	/**
 	 * init - Initialize the setting of your module instance, it takes a setting object
@@ -29,8 +32,10 @@ function TranslateJSONObject() {
 			console.warn(MISSING_TOKEN_ERROR_MESSAGE);
 			return false;
 		} else if (setting.yandexApiKey) {
+			serviceType = constant.YANDEX_NAME;
 			translateSrv = require('./service/yandex.js');
 		} else {
+			serviceType = constant.GOOGLE_NAME;
 			translateSrv = require('./service/google.js');
 		}
 
@@ -54,6 +59,10 @@ function TranslateJSONObject() {
 			return Promise.reject('Please provide a language param [type String] e.g. translate(obj, es)');
 		}
 
+		if(!isValidLang(language, serviceType)) {
+			return Promise.reject(serviceType + ' doesn\'t support the language you specified [' + language + '], please try another language');
+		}
+
 		function recurisveTranslateObject(destObj, srcObj) {
 			// Loop through the entire object collection
 			_.forEach(srcObj, loopHandler);
diff --git a/lib/util/constant.js b/lib/util/constant.js
new file mode 100644
index 0000000..b3d69bb
--- /dev/null
+++ b/lib/util/constant.js
@@ -0,0 +1,4 @@
+module.exports = {
+	GOOGLE_NAME: 'Google',
+	YANDEX_NAME: 'Yandex'
+};
diff --git a/lib/util/valid-lang.js b/lib/util/valid-lang.js
new file mode 100644
index 0000000..af52eea
--- /dev/null
+++ b/lib/util/valid-lang.js
@@ -0,0 +1,15 @@
+var constant = require('./constant');
+
+var google = ['af', 'am', 'ar', 'az', 'be', 'bg', 'bn', 'bs', 'ca', 'ceb', 'co', 'cs', 'cy', 'da', 'de', 'el', 'en', 'eo', 'es', 'et', 'eu', 'fa', 'fi', 'fr', 'fy', 'ga', 'gd', 'gl', 'gu', 'ha', 'haw', 'hi', 'hmn', 'hr', 'ht', 'hu', 'hy', 'id', 'ig', 'is', 'it', 'iw', 'ja', 'jw', 'ka', 'kk', 'km', 'kn', 'ko', 'ku', 'ky', 'la', 'lb', 'lo', 'lt', 'lv', 'ma', 'mg', 'mi', 'mk', 'ml', 'mn', 'mr', 'ms', 'mt', 'my', 'ne', 'nl', 'no', 'ny', 'pl', 'ps', 'pt', 'ro', 'ru', 'sd', 'si', 'sk', 'sl', 'sm', 'sn', 'so', 'sq', 'sr', 'st', 'su', 'sv', 'sw', 'ta', 'te', 'tg', 'th', 'tl', 'tr', 'uk', 'ur', 'uz', 'vi', 'xh', 'yi', 'yo', 'zh-CN', 'zh-TW', 'zu'];
+var yandex = ['af', 'am', 'ar', 'az', 'ba', 'be', 'bg', 'bn', 'bs', 'ca', 'ceb', 'cs', 'cy', 'da', 'de', 'el', 'en', 'eo', 'es', 'et', 'eu', 'fa', 'fi', 'fr', 'ga', 'gd', 'gl', 'gu', 'he', 'hi', 'hr', 'ht', 'hu', 'hy', 'id', 'is', 'it', 'ja', 'jv', 'ka', 'kk', 'km', 'kn', 'ko', 'ky', 'la', 'lb', 'lo', 'lt', 'lv', 'mg', 'mhr', 'mi', 'mk', 'ml', 'mn', 'mr', 'mrj', 'ms', 'mt', 'my', 'ne', 'nl', 'no', 'pa', 'pap', 'pl', 'pt', 'ro', 'ru', 'si', 'sk', 'sl', 'sq', 'sr', 'su', 'sv', 'sw', 'ta', 'te', 'tg', 'th', 'tl', 'tr', 'tt', 'udm', 'uk', 'ur', 'uz', 'vi', 'xh', 'yi', 'zh'];
+
+module.exports = function (lang, service) {
+	switch (service) {
+		case constant.GOOGLE_NAME:
+			return google.indexOf(lang) !== -1;
+		case constant.YANDEX_NAME:
+			return yandex.indexOf(lang) !== -1;
+		default:
+			return false;
+	}
+};