diff --git a/index.js b/index.js
index 30dd415..9ac1682 100644
--- a/index.js
+++ b/index.js
@@ -38,60 +38,7 @@ var reader = transit.reader('json', {
   }
 });
 
-var writer = transit.writer('json', {
-  handlers: transit.map([
-    Immutable.Map, transit.makeWriteHandler({
-      tag: function() {
-        return 'iM';
-      },
-      rep: function(m) {
-        var i = 0, a = new Array(2 * m.size);
-        m.forEach(function(v, k) {
-          a[i++] = k;
-          a[i++] = v;
-        });
-        return a;
-      }
-    }),
-    Immutable.OrderedMap, transit.makeWriteHandler({
-      tag: function() {
-        return 'iOM';
-      },
-      rep: function(m) {
-        var i = 0, a = new Array(2 * m.size);
-        m.forEach(function(v, k) {
-          a[i++] = k;
-          a[i++] = v;
-        });
-        return a;
-      }
-    }),
-    Immutable.List, transit.makeWriteHandler({
-      tag: function() {
-        return "iL";
-      },
-      rep: function(v) {
-        return v.toArray();
-      }
-    }),
-    Immutable.Set, transit.makeWriteHandler({
-      tag: function() {
-        return "iS";
-      },
-      rep: function(v) {
-        return v.toArray();
-      }
-    }),
-    Function, transit.makeWriteHandler({
-      tag: function() {
-        return '_';
-      },
-      rep: function() {
-        return null;
-      }
-    })
-  ])
-});
+var writer = createWriter(false);
 
 exports.toJSON = toJSON;
 function toJSON(data) {
@@ -102,3 +49,83 @@ exports.fromJSON = fromJSON;
 function fromJSON(data) {
   return reader.read(data);
 }
+
+function withFilter(predicate) {
+  var filteredWriter = createWriter(predicate);
+  return {
+    toJSON: function(data) {
+      return filteredWriter.write(data);
+    },
+    fromJSON: fromJSON
+  }
+}
+exports.withFilter = withFilter;
+
+function createWriter(predicate) {
+  return transit.writer('json', {
+      handlers: transit.map([
+        Immutable.Map, transit.makeWriteHandler({
+          tag: function() {
+            return 'iM';
+          },
+          rep: function(m) {
+            var i = 0, a = new Array(2 * m.size);
+            if (predicate) {
+              m = m.filter(predicate);
+            }
+            m.forEach(function(v, k) {
+              a[i++] = k;
+              a[i++] = v;
+            });
+            return a;
+          }
+        }),
+        Immutable.OrderedMap, transit.makeWriteHandler({
+          tag: function() {
+            return 'iOM';
+          },
+          rep: function(m) {
+            var i = 0, a = new Array(2 * m.size);
+            if (predicate) {
+              m = m.filter(predicate);
+            }
+            m.forEach(function(v, k) {
+              a[i++] = k;
+              a[i++] = v;
+            });
+            return a;
+          }
+        }),
+        Immutable.List, transit.makeWriteHandler({
+          tag: function() {
+            return "iL";
+          },
+          rep: function(v) {
+            if (predicate) {
+              v = v.filter(predicate);
+            }
+            return v.toArray();
+          }
+        }),
+        Immutable.Set, transit.makeWriteHandler({
+          tag: function() {
+            return "iS";
+          },
+          rep: function(v) {
+            if (predicate) {
+              v = v.filter(predicate);
+            }
+            return v.toArray();
+          }
+        }),
+        Function, transit.makeWriteHandler({
+          tag: function() {
+            return '_';
+          },
+          rep: function() {
+            return null;
+          }
+        })
+      ])
+    });
+}
\ No newline at end of file
diff --git a/test/test.js b/test/test.js
index 84c4a8b..c753ba5 100644
--- a/test/test.js
+++ b/test/test.js
@@ -101,4 +101,38 @@ describe('transit', function() {
     var result = transit.fromJSON(transit.toJSON(input));
     expect(result.get('a')).to.eql(null);
   });
+  describe('Using createWriter factory', function(){
+    it('should ignore if predicate is false', function() {
+      var input = Immutable.Map({ a: 'foo', _b: 'bar', c: Immutable.Map({d: 'deep', _e: 'hide'})});
+      var filter = transit.withFilter(function(val, key) { return key[0] !== '_'});
+      var result = filter.fromJSON(filter.toJSON(input));
+      expect(result.get('a')).to.eql('foo');
+      expect(result.get('_b')).to.be.undefined;
+      expect(result.getIn(['c', 'd'])).to.eql('deep');
+      expect(result.getIn(['c', '_e'])).to.be.undefined;
+
+      input = Immutable.OrderedMap().set('a', 'baz').set('_b', 'bar').set('c', Immutable.OrderedMap({d: 'deep', _e: 'hide'}));
+      result = filter.fromJSON(filter.toJSON(input));
+      expect(result.get('a')).to.eql('baz');
+      expect(result.get('_b')).to.be.undefined;
+      expect(result.getIn(['c', 'd'])).to.eql('deep');
+      expect(result.getIn(['c', '_e'])).to.be.undefined;
+
+      input = Immutable.OrderedMap().set('a', 'baz').set('_b', 'bar').set('c', Immutable.Map({d: 'deep', _e: 'hide'}));
+      result = filter.fromJSON(filter.toJSON(input));
+      expect(result.get('a')).to.eql('baz');
+      expect(result.get('_b')).to.be.undefined;
+      expect(result.getIn(['c', 'd'])).to.eql('deep');
+      expect(result.getIn(['c', '_e'])).to.be.undefined;
+
+      input = Immutable.Set.of(1, 2, 3, 3, 'a')
+      filter = transit.withFilter(function(val, key) { return typeof val === 'number'});
+      result = filter.fromJSON(filter.toJSON(input));
+      expect(result.includes('a')).to.be.false;
+
+      input = Immutable.List.of(1, 2, 3, 3, 'a')
+      result = filter.fromJSON(filter.toJSON(input));
+      expect(result.includes('a')).to.be.false;
+    });
+  });
 });