2 files changed, 25 insertions, 3 deletions
diff --git a/src/main/scala/cc/spray/json/JsValue.scala b/src/main/scala/cc/spray/json/JsValue.scala
index 86dbb06..e4ab734 100644
--- a/src/main/scala/cc/spray/json/JsValue.scala
+++ b/src/main/scala/cc/spray/json/JsValue.scala
@@ -110,7 +110,11 @@ case class JsNumber(value: BigDecimal) extends JsValue
 object JsNumber {
   def apply(n: Int) = new JsNumber(BigDecimal(n))
   def apply(n: Long) = new JsNumber(BigDecimal(n))
-  def apply(n: Double) = new JsNumber(BigDecimal(n))
+  def apply(n: Double) = n match {
+    case n if n.isNaN      => JsNull
+    case n if n.isInfinity => JsNull
+    case _                 => new JsNumber(BigDecimal(n))
+  }
   def apply(n: BigInt) = new JsNumber(BigDecimal(n))
   def apply(n: String) = new JsNumber(BigDecimal(n))
 }
@@ -135,4 +139,4 @@ case object JsFalse extends JsBoolean {
 /**
   * The representation for JSON null.
  */
-case object JsNull extends JsValue
-\ No newline at end of file
+case object JsNull extends JsValue
diff --git a/src/test/scala/cc/spray/json/BasicFormatsSpec.scala b/src/test/scala/cc/spray/json/BasicFormatsSpec.scala
index fcae4bb..7f74e37 100644
--- a/src/test/scala/cc/spray/json/BasicFormatsSpec.scala
+++ b/src/test/scala/cc/spray/json/BasicFormatsSpec.scala
@@ -26,6 +26,15 @@ class BasicFormatsSpec extends Specification with DefaultJsonProtocol {
     "convert a Float to a JsNumber" in {
       4.2f.toJson mustEqual JsNumber(4.2f)
     }
+    "convert a Float.NaN to a JsNull" in {
+      Float.NaN.toJson mustEqual JsNull
+    }
+    "convert a Float.PositiveInfinity to a JsNull" in {
+      Float.PositiveInfinity.toJson mustEqual JsNull
+    }
+    "convert a Float.NegativeInfinity to a JsNull" in {
+      Float.NegativeInfinity.toJson mustEqual JsNull
+    }
     "convert a JsNumber to a Float" in {
       JsNumber(4.2f).fromJson[Float] mustEqual 4.2f 
     }
@@ -35,6 +44,15 @@ class BasicFormatsSpec extends Specification with DefaultJsonProtocol {
     "convert a Double to a JsNumber" in {
       4.2.toJson mustEqual JsNumber(4.2)
     }
+    "convert a Double.NaN to a JsNull" in {
+      Double.NaN.toJson mustEqual JsNull
+    }
+    "convert a Double.PositiveInfinity to a JsNull" in {
+      Double.PositiveInfinity.toJson mustEqual JsNull
+    }
+    "convert a Double.NegativeInfinity to a JsNull" in {
+      Double.NegativeInfinity.toJson mustEqual JsNull
+    }
     "convert a JsNumber to a Double" in {
       JsNumber(4.2).fromJson[Double] mustEqual 4.2 
     }
@@ -119,4 +137,4 @@ class BasicFormatsSpec extends Specification with DefaultJsonProtocol {
     }
   }
   
-}
-\ No newline at end of file
+}