diff --git a/lib/revalidator.js b/lib/revalidator.js
index 1faa25f..08e3f69 100644
--- a/lib/revalidator.js
+++ b/lib/revalidator.js
@@ -26,7 +26,8 @@
   // (<code>{}</code>) in this case.
   //
   function validate(object, schema, options) {
-    options = mixin({}, options, validate.defaults);
+    options = mixin({}, validate.defaults, options);
+  
     var errors = [];
 
     validateObject(object, schema, options, errors);
@@ -76,7 +77,25 @@
        * <em>Default: <code>true</code></em>
        * </p>
        */
-      validateFormatExtensions: true
+      validateFormatExtensions: true,
+      /**
+       * <p>
+       * When {@link #addMissingDefaults} is <code>true</code>,
+       * if property is missing and it has a default value it will be added to the object.
+       * </p><p>
+       * <em>Default: <code>false</code></em>
+       * </p>
+       */
+       addMissingDefaults: false,
+       /**
+       * <p>
+       * When {@link #deleteUnknowProperties} is <code>true</code>,
+       * if property is not declared in schema it is deleted from object.
+       * </p><p>
+       * <em>Default: <code>false</code></em>
+       * </p>
+       */
+       deleteUnknowProperties: false
   };
 
   /**
@@ -193,6 +212,16 @@
       }
     }
 
+    // deleteUnknowProperties
+    if(options.deleteUnknowProperties){
+      props = schema.properties ? Object.keys(schema.properties) : [];
+      props = props.concat(schema.patternProperties ? Object.keys(schema.patternProperties) : []);
+      for (var p in object){
+        if (props.indexOf(p) === -1)
+          delete object[p];
+      }
+    };
+
     // see 5.4
     if (undefined !== schema.additionalProperties) {
       var i, l;
@@ -201,6 +230,7 @@
         return -1 === visitedProps.indexOf(k);
       });
 
+
       // Prevent additional properties; each unvisited property is therefore an error
       if (schema.additionalProperties === false && unvisitedProps.length > 0) {
         for (i = 0, l = unvisitedProps.length; i < l; i++) {
@@ -230,7 +260,12 @@
     }
 
     if (value === undefined) {
-      if (schema.required && schema.type !== 'any') {
+      if(schema.default !== undefined && options.addMissingDefaults){
+        if (typeof schema.default === 'function')
+          object[property] = value = schema.default();
+        else
+          object[property] = value = schema.default;
+      }else if (schema.required && schema.type !== 'any') {
         return error('required', property, undefined, schema, errors);
       } else {
         return;
diff --git a/test/validator-test.js b/test/validator-test.js
index 0d2590d..e6e28eb 100644
--- a/test/validator-test.js
+++ b/test/validator-test.js
@@ -231,7 +231,10 @@ vows.describe('revalidator', {
         category:  { type: 'string' },
         palindrome: {type: 'string', conform: function(val) {
           return val == val.split("").reverse().join(""); }
-        }
+        },
+        printed_at: { type: 'string', default: Date},
+        printed_copies: { type: 'number', default: 100},
+        shipped_copies: { type: 'number', default: function(){return 50}},
       },
       patternProperties: {
         '^_': {
@@ -273,6 +276,37 @@ vows.describe('revalidator', {
           "and an error concerning the 'required' attribute": assertHasError('required'),
           "and the error message defined":                    assertHasErrorMsg('required', "is essential for survival")
         },
+        "and if it has a missing default property": {
+          topic: function (object, schema) {
+            var duble = clone(object);
+            delete duble.printed_copies;
+            delete duble.printed_at;
+            delete duble.shipped_copies;
+            return {
+              valid: revalidator.validate(duble, schema, { addMissingDefaults: true }).valid,
+              target: duble
+            }
+          },
+          "add missing properties to object with default values": function(res){
+            assert.ok(res.valid);
+            assert.equal(res.target.printed_copies, 100);
+            assert.equal(res.target.shipped_copies, 50);
+          }
+        },
+        "and if it has properties not declared in schema":{
+          topic: function(object, schema){
+            var duble = clone(object);
+            duble.not_here = 'ohno';
+            return {
+              valid: revalidator.validate(duble, schema, { deleteUnknowProperties: true }).valid,
+              target: duble
+            }
+          },
+          "it should be removed from object when using strictSchema true": function(res){
+            assert.equal(res.target['not_here'], null);
+            assert.ok(res.valid);
+          }
+        },
         "and if it has a missing non-required property": {
           topic: function (object, schema) {
             object = clone(object);