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diff --git a/shared/src/main/scala/spray/json/AdditionalFormats.scala b/shared/src/main/scala/spray/json/AdditionalFormats.scala
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+/*
+ * Original implementation (C) 2009-2011 Debasish Ghosh
+ * Adapted and extended in 2011 by Mathias Doenitz
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package spray.json
+
+/**
+  * Provides additional JsonFormats and helpers
+ */
+trait AdditionalFormats {
+
+  implicit object JsValueFormat extends JsonFormat[JsValue] {
+    def write(value: JsValue) = value
+    def read(value: JsValue) = value
+  }
+
+  implicit object RootJsObjectFormat extends RootJsonFormat[JsObject] {
+    def write(value: JsObject) = value
+    def read(value: JsValue) = value.asJsObject
+  }
+
+  implicit object RootJsArrayFormat extends RootJsonFormat[JsArray] {
+    def write(value: JsArray) = value
+    def read(value: JsValue) = value match {
+      case x: JsArray => x
+      case _ => deserializationError("JSON array expected")
+    }
+  }
+
+  /**
+   * Constructs a JsonFormat from its two parts, JsonReader and JsonWriter.
+   */
+  def jsonFormat[T](reader: JsonReader[T], writer: JsonWriter[T]) = new JsonFormat[T] {
+    def write(obj: T) = writer.write(obj)
+    def read(json: JsValue) = reader.read(json)
+  }
+
+  /**
+   * Constructs a RootJsonFormat from its two parts, RootJsonReader and RootJsonWriter.
+   */
+  def rootJsonFormat[T](reader: RootJsonReader[T], writer: RootJsonWriter[T]) =
+    rootFormat(jsonFormat(reader, writer))
+
+  /**
+   * Turns a JsonWriter into a JsonFormat that throws an UnsupportedOperationException for reads.
+   */
+  def lift[T](writer :JsonWriter[T]) = new JsonFormat[T] {
+    def write(obj: T): JsValue = writer.write(obj)
+    def read(value: JsValue) =
+      throw new UnsupportedOperationException("JsonReader implementation missing")
+  }
+
+  /**
+   * Turns a RootJsonWriter into a RootJsonFormat that throws an UnsupportedOperationException for reads.
+   */
+  def lift[T](writer :RootJsonWriter[T]): RootJsonFormat[T] =
+    rootFormat(lift(writer :JsonWriter[T]))
+
+  /**
+   * Turns a JsonReader into a JsonFormat that throws an UnsupportedOperationException for writes.
+   */
+  def lift[T <: AnyRef](reader :JsonReader[T]) = new JsonFormat[T] {
+    def write(obj: T): JsValue =
+      throw new UnsupportedOperationException("No JsonWriter[" + obj.getClass + "] available")
+    def read(value: JsValue) = reader.read(value)
+  }
+
+  /**
+   * Turns a RootJsonReader into a RootJsonFormat that throws an UnsupportedOperationException for writes.
+   */
+  def lift[T <: AnyRef](reader :RootJsonReader[T]): RootJsonFormat[T] =
+    rootFormat(lift(reader :JsonReader[T]))
+
+  /**
+   * Lazy wrapper around serialization. Useful when you want to serialize (mutually) recursive structures.
+   */
+  def lazyFormat[T](format: => JsonFormat[T]) = new JsonFormat[T] {
+    lazy val delegate = format;
+    def write(x: T) = delegate.write(x);
+    def read(value: JsValue) = delegate.read(value);
+  }
+
+  /**
+   * Explicitly turns a JsonFormat into a RootJsonFormat.
+   */
+  def rootFormat[T](format: JsonFormat[T]) = new RootJsonFormat[T] {
+    def write(obj: T) = format.write(obj)
+    def read(json: JsValue) = format.read(json)
+  }
+
+  /**
+   * Wraps an existing JsonReader with Exception protection.
+   */
+  def safeReader[A :JsonReader] = new JsonReader[Either[Exception, A]] {
+    def read(json: JsValue) = {
+      try {
+        Right(json.convertTo[A])
+      } catch {
+        case e: Exception => Left(e)
+      }
+    }
+  }
+
+}
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