diff --git a/src/cbor/encoder.cr b/src/cbor/encoder.cr
index 65e5e63..c6d436b 100644
--- a/src/cbor/encoder.cr
+++ b/src/cbor/encoder.cr
@@ -1,3 +1,5 @@
+require "json"
+
 class CBOR::Encoder
   def self.new(io : IO = IO::Memory.new)
     packer = new(io)
@@ -8,6 +10,37 @@ class CBOR::Encoder
   def initialize(@io : IO = IO::Memory.new)
   end
 
+  def write(j : JSON::Any)
+    # Test each possible value of JSON::Any
+    case j
+    when .as_bool?
+      write j.as_bool
+    when .as_i?
+      write j.as_i
+    when .as_i64?
+      write j.as_i64
+    when .as_f?
+      write j.as_f
+    when .as_f32?
+      write j.as_f32
+    when .as_s?
+      write j.as_s
+    when .as_a?
+      write j.as_a
+    when .as_h?
+      write j.as_h
+    else
+      # JSON::Any ".as_bool?" function fails.
+      case j.raw
+      when Bool
+        write j.as_bool
+      when Nil
+      else
+        raise "Unknown kind of JSON: #{j.raw}"
+      end
+    end
+  end
+
   def write(value : Nil | Nil.class, use_undefined : Bool = false)
     write(use_undefined ? SimpleValue::Undefined : SimpleValue::Null)
   end