diff --git a/spec/KiwiSpec.js b/spec/KiwiSpec.js
index b0e115b..0d5c8b4 100644
--- a/spec/KiwiSpec.js
+++ b/spec/KiwiSpec.js
@@ -1,53 +1,75 @@
-describe('Kiwi.compose', function() {
-    it('should return the empty string when input is empty',function() {
-        var input = "";
-        expect(Kiwi.compose(input)).toEqual(input);
-    });
+describe('Kiwi.compose - %', function() {
+	it('should return the empty string when input is empty',function() {
+		var input = "";
+		expect(Kiwi.compose(input)).toEqual(input);
+	});
 
-    it('should return the input string when array is null',function() {
-        var input = "text without interpolation";
-        expect(Kiwi.compose(input)).toEqual(input);
-    });
+	it('should return the input string when array is null',function() {
+		var input = "text without interpolation";
+		expect(Kiwi.compose(input)).toEqual(input);
+	});
 
-    it('should return replace %s with text', function() {
-        var input = "There are % apples";
-        var result = "There are five apples";
-        expect(Kiwi.compose(input, ["five"])).toEqual(result);
-    });
+	it('should return replace %s with text', function() {
+		var input = "There are % apples";
+		var result = "There are five apples";
+		expect(Kiwi.compose(input, ["five"])).toEqual(result);
+	});
 
-    it('should return replace % with text when % is last', function() {
-        var input = "There are five %";
-        var result = "There are five apples";
-        expect(Kiwi.compose(input, ["apples"])).toEqual(result);
-    });
+	it('should return replace % with text when % is last', function() {
+		var input = "There are five %";
+		var result = "There are five apples";
+		expect(Kiwi.compose(input, ["apples"])).toEqual(result);
+	});
 
-    it('should return replace % when input is %', function() {
-        var input = "%";
-        var result = "There are five apples";
-        expect(Kiwi.compose(input, [result])).toEqual(result);
-    });
+	it('should return replace % when input is %', function() {
+		var input = "%";
+		var result = "There are five apples";
+		expect(Kiwi.compose(input, [result])).toEqual(result);
+	});
 
-    it('should return replace 2 %s when input has 2 %s', function() {
-        var input = "There are % %";
-        var result = "There are five apples";
-        expect(Kiwi.compose(input, ["five", "apples"])).toEqual(result);
-    });
+	it('should return replace 2 %s when input has 2 %s', function() {
+		var input = "There are % %";
+		var result = "There are five apples";
+		expect(Kiwi.compose(input, ["five", "apples"])).toEqual(result);
+	});
 
-    it('should return replace 2 %s when input has 2 %s', function() {
-        var input = "% are % apples";
-        var result = "There are five apples";
-        expect(Kiwi.compose(input, ["There", "five"])).toEqual(result);
-    });
+	it('should return replace 2 %s when input has 2 %s', function() {
+		var input = "% are % apples";
+		var result = "There are five apples";
+		expect(Kiwi.compose(input, ["There", "five"])).toEqual(result);
+	});
 
-    it('should return escaped %', function() {
-        var input = "The % is 2.3`%";
-        var result = "The rate is 2.3%";
-        expect(Kiwi.compose(input, ["rate"])).toEqual(result);
-    });
+	it('should return escaped %', function() {
+		var input = "The % is 2.3`%";
+		var result = "The rate is 2.3%";
+		expect(Kiwi.compose(input, ["rate"])).toEqual(result);
+	});
 
-    it('should use an empty string when size of the array less fits the placeholders.', function() {
-        var input = "The quick brown % jumps % the lazy %.";
-        var result = "The quick brown fox jumps over the lazy .";
-        expect(Kiwi.compose(input, ["fox", "over"])).toEqual(result);
-    });
+	it('should use an empty string when size of the array less fits the placeholders.', function() {
+		var input = "The quick brown % jumps % the lazy %.";
+		var result = "The quick brown fox jumps over the lazy .";
+		expect(Kiwi.compose(input, ["fox", "over"])).toEqual(result);
+	});
+});
+
+describe('Kiwi.compose - %{}', function() {
+	it('should replace the variable defined in %{}',function() {
+		var input = "The quick brown %{f} jumps over the lazy %{d}.";
+		var dic = {"f": "fox", "d": "dog"};
+		var output = "The quick brown fox jumps over the lazy dog.";
+		expect(Kiwi.compose(input, dic)).toEqual(output);
+	});
+
+	it('should throw a syntax error.',function() {
+		var input = "The quick brown %{f jumps over the lazy dog.";
+		var dic = {"f": "fox", "d": "dog"};
+		expect(function(){Kiwi.compose(input, dic)}).toThrow(Error("Syntax error."));
+	});
+
+	it('should ignore when the variable is not available',function() {
+		var input = "The quick brown %{f} jumps over the lazy dog.";
+		var dic = {"d": "dog"};
+		var output = "The quick brown  jumps over the lazy dog.";
+		expect(Kiwi.compose(input, dic)).toEqual(output);
+	});
 });
\ No newline at end of file
diff --git a/src/Kiwi.js b/src/Kiwi.js
index 46142fc..9eccd76 100644
--- a/src/Kiwi.js
+++ b/src/Kiwi.js
@@ -1,9 +1,7 @@
 var Kiwi = (function ($) {
 	var TRANSPOSE_CHAR = '%';
 
-	var interpolate = function(text, array){
-		if(array === undefined) return text;
-
+	var interpolate_general = function(text, array){
 		var stringToReturn = ""
 		 	,length = text.length
 		 	,index = 0
@@ -31,6 +29,59 @@ var Kiwi = (function ($) {
 			}
 		}
 		return stringToReturn;
+	}
+
+	var get_key_length = function(text, index){
+		var length = text.length;
+
+		var key = "";
+
+		var i = index;
+		while(i < length && text[i] !== '}'){
+			key += text[i];
+			i++;
+		}
+
+		if(text[i] === '}') key += '}';
+		else throw Error("Syntax error.");
+
+		return [key.slice(2, key.length - 1), key.length];
+	} 
+
+	var interpolate_key_value = function(text, json){
+		var stringToReturn = ""
+		 	,length = text.length
+		 	,index = 0;
+
+		for(var i = 0; i < length; i++){
+			var currentChar = text[i];
+			var nextChar = null;
+			if(i + 1 < length) nextChar = text[i+1];
+
+			if(currentChar === '%' && nextChar === '{'){
+				var result = get_key_length(text, i);
+				var key = result[0];
+				var key_length = result[1];
+
+				stringToReturn += (json[key] === undefined ? "" : json[key]);
+				i += key_length - 1 ;
+
+			}else{
+				stringToReturn += currentChar;
+			}
+		}
+
+		return stringToReturn;
+	}
+
+	var interpolate = function(text, input){
+		if(input === undefined) return text;
+
+		if(Object.prototype.toString.call(input) === "[object Array]"){
+			return interpolate_general(text, input);
+		}else{
+			return interpolate_key_value(text, input);
+		}
 	};
 
 	return {