diff --git a/lib/grpc/codec/json.ex b/lib/grpc/codec/json.ex
index d84a75c1..b82b455d 100644
--- a/lib/grpc/codec/json.ex
+++ b/lib/grpc/codec/json.ex
@@ -1,67 +1,73 @@
-defmodule GRPC.Codec.JSON do
-  @moduledoc """
-  JSON Codec for gRPC communication.
+if Code.ensure_loaded?(Jason) do
+  defmodule GRPC.Codec.JSON do
+    @moduledoc """
+    JSON Codec for gRPC communication.
 
-  This module implements the `GRPC.Codec` behaviour, providing encoding and decoding functions
-  for JSON serialization in the context of gRPC communication.
+    This module implements the `GRPC.Codec` behaviour, providing encoding and decoding functions
+    for JSON serialization in the context of gRPC communication.
 
-  ## Behavior Functions
+    ## Behavior Functions
 
-  - `name/0`: Returns the name of the codec, which is "json".
-  - `encode/1`: Encodes a struct using the Protobuf.JSON.encode!/1 function.
-  - `decode/2`: Decodes binary data into a map using the Jason library.
+    - `name/0`: Returns the name of the codec, which is "json".
+    - `encode/1`: Encodes a struct using the Protobuf.JSON.encode!/1 function.
+    - `decode/2`: Decodes binary data into a map using the Jason library.
 
-  This module requires the Jason dependency.
-  """
-  @behaviour GRPC.Codec
+    This module requires the Jason dependency.
+    """
+    @behaviour GRPC.Codec
 
-  def name(), do: "json"
+    def name(), do: "json"
 
-  @doc """
-  Encodes a struct using the Protobuf.JSON.encode!/1 function.
+    @doc """
+    Encodes a struct using the Protobuf.JSON.encode!/1 function.
 
-  ### Parameters:
+    ### Parameters:
 
-  - `struct` - The struct to be encoded.
+    - `struct` - The struct to be encoded.
 
-  ### Returns:
+    ### Returns:
 
-  The encoded binary data.
+    The encoded binary data.
 
-  ### Example:
+    ### Example:
 
-  ```elixir
-  %MyStruct{id: 1, name: "John"} |> GRPC.Codec.JSON.encode()
-  ```
+    ```elixir
+    %MyStruct{id: 1, name: "John"} |> GRPC.Codec.JSON.encode()
+    ```
 
-  """
+    """
 
-  def encode(struct) do
-    Protobuf.JSON.encode!(struct)
-  end
+    def encode(struct) do
+      Protobuf.JSON.encode!(struct)
+    end
 
-  @doc """
-  Decodes binary data into a map using the Jason library.
-  Parameters:
+    @doc """
+    Decodes binary data into a map using the Jason library.
+    Parameters:
 
-      binary - The binary data to be decoded.
-      module - Module to be created.
+        binary - The binary data to be decoded.
+        module - Module to be created.
 
-  Returns:
+    Returns:
 
-  A map representing the decoded data.
+    A map representing the decoded data.
 
-  Raises:
+    Raises:
 
-  Raises an error if the Jason library is not loaded.
+    Raises an error if the Jason library is not loaded.
 
-  Example:
+    Example:
 
-  ```elixir
-  binary_data |> GRPC.Codec.JSON.decode(__MODULE__)
-  ```
-  """
-  def decode(<<>>, _module), do: %{}
+    ```elixir
+    binary_data |> GRPC.Codec.JSON.decode(__MODULE__)
+    ```
+    """
+    def decode(<<>>, _module), do: %{}
 
-  def decode(binary, _module), do: Jason.decode!(binary)
+    def decode(binary, _module), do: Jason.decode!(binary)
+  end
+else
+  defmodule GRPC.Codec.JSON do
+    def decode(_, _), do: raise(ArgumentError, "Module Jason not found")
+  end
 end
diff --git a/lib/grpc/protoc/generator/service.ex b/lib/grpc/protoc/generator/service.ex
index f7aeea10..107e302d 100644
--- a/lib/grpc/protoc/generator/service.ex
+++ b/lib/grpc/protoc/generator/service.ex
@@ -36,7 +36,7 @@ defmodule GRPC.Protoc.Generator.Service do
          methods: methods,
          descriptor_fun_body: descriptor_fun_body,
          version: Util.version(),
-         module_doc?: ctx.include_docs?
+         module_doc?: false
        )
      )}
   end
diff --git a/test/grpc/integration/server_test.exs b/test/grpc/integration/server_test.exs
index 6dd76900..d8041179 100644
--- a/test/grpc/integration/server_test.exs
+++ b/test/grpc/integration/server_test.exs
@@ -377,7 +377,7 @@ defmodule GRPC.Integration.ServerTest do
 
     test "should map grpc error codes to http status" do
       run_server([TranscodeErrorServer], fn port ->
-        for {code_name, status} <- [
+        for {code_name, _status} <- [
               {"cancelled", 400},
               {"unknown", 500},
               {"invalid_argument", 400},
@@ -397,7 +397,7 @@ defmodule GRPC.Integration.ServerTest do
             ] do
           {:ok, conn_pid} = :gun.open(~c"localhost", port)
 
-          stream_ref =
+          _stream_ref =
             :gun.get(
               conn_pid,
               "/v1/messages/#{code_name}",