Allow the usage of JSON for Elixir 1.18+

.dialyzer_ignore.exs

@@ -1,3 +1,4 @@
 [
-  {"test/support/example_plug_application.ex"}
+  {"test/support/example_plug_application.ex"},
+  {"test/support/test_helpers.ex"}
 ]

README.md

@@ -18,20 +18,34 @@ This is the official Sentry SDK for [Sentry].
 
 ### Install
 
-To use Sentry in your project, add it as a dependency in your `mix.exs` file. Sentry does not install a JSON library nor HTTP client by itself. Sentry will default to trying to use [Jason] for JSON serialization and [Hackney] for HTTP requests, but can be configured to use other ones. To use the default ones, do:
+To use Sentry in your project, add it as a dependency in your `mix.exs` file.
+
+Sentry does not install a JSON library nor an HTTP client by itself. Sentry will default to the [built-in `JSON`](https://hexdocs.pm/elixir/JSON.html) for JSON and [Hackney] for HTTP requests, but can be configured to use other ones. To use the default ones, do:
 
 ```elixir
 defp deps do
   [
     # ...
 
     {:sentry, "~> 10.0"},
-    {:jason, "~> 1.4"},
     {:hackney, "~> 1.19"}
   ]
 end
 ```
 
+> [!WARNING]
+> If you're using an Elixir version before 1.18, the Sentry SDK will default to [Jason] as the JSON library. However, you **must** add it to your dependencies:
+>
+> ```elixir
+> defp deps do
+>   [
+>     # ...
+>     {:sentry, "~> 10.0"},
+>     {:jason, "~> 1.4"}
+>   ]
+> end
+> ```
+
 ### Configuration
 
 Sentry has a range of configuration options, but most applications will have a configuration that looks like the following:
@@ -130,7 +144,6 @@ Thanks to everyone who has contributed to this project so far.
   <img src="https://contributors-img.web.app/image?repo=getsentry/sentry-elixir" />
 </a>
 
-
 ## Getting Help/Support
 
 If you need help setting up or configuring the Elixir SDK (or anything else in the Sentry universe) please head over to the [Sentry Community on Discord](https://discord.com/invite/Ww9hbqr). There is a ton of great people in our Discord community ready to help you!

config/config.exs

@@ -15,4 +15,4 @@ if config_env() == :test do
   config :logger, backends: []
 end
 
-config :phoenix, :json_library, Jason
+config :phoenix, :json_library, if(Code.ensure_loaded?(JSON), do: JSON, else: Jason)

lib/sentry/client.ex

@@ -295,7 +295,7 @@ defmodule Sentry.Client do
 
   defp sanitize_non_jsonable_value(value, json_library) do
     try do
-      json_library.encode(value)
+      Sentry.JSON.encode(value, json_library)
     catch
       _type, _reason -> {:changed, inspect(value)}
     else

lib/sentry/config.ex

@@ -146,14 +146,20 @@ defmodule Sentry.Config do
       environment variable is set, it will be used as the default value.
       """
     ],
+    # TODO: deprecate this once we require Elixir 1.18+, when we can force users to use
+    # the JSON module.
     json_library: [
       type: {:custom, __MODULE__, :__validate_json_library__, []},
-      default: Jason,
       type_doc: "`t:module/0`",
+      default: if(Code.ensure_loaded?(JSON), do: JSON, else: Jason),
       doc: """
       A module that implements the "standard" Elixir JSON behaviour, that is, exports the
-      `encode/1` and `decode/1` functions. If you use the default, make sure to add
-      [`:jason`](https://hex.pm/packages/jason) as a dependency of your application.
+      `encode/1` and `decode/1` functions.
+
+      Defaults to `Jason` if the `JSON` kernel module is not available (it was introduced
+      in Elixir 1.18.0). If you use the default configuration with Elixir version lower than
+      1.18, this option will default to `Jason`, but you will have to add
+      [`:jason`](https://hexa.pm/packages/jason) as a dependency of your application.
       """
     ],
     send_client_reports: [
@@ -693,6 +699,8 @@ defmodule Sentry.Config do
     {:error, "nil is not a valid value for the :json_library option"}
   end
 
+  def __validate_json_library__(JSON), do: {:ok, JSON}
+
   def __validate_json_library__(mod) when is_atom(mod) do
     try do
       with {:ok, %{}} <- mod.decode("{}"),

lib/sentry/envelope.ex

@@ -81,7 +81,7 @@ defmodule Sentry.Envelope do
   end
 
   defp item_to_binary(json_library, %Event{} = event) do
-    case event |> Sentry.Client.render_event() |> json_library.encode() do
+    case event |> Sentry.Client.render_event() |> Sentry.JSON.encode(json_library) do
       {:ok, encoded_event} ->
         header = ~s({"type":"event","length":#{byte_size(encoded_event)}})
         [header, ?\n, encoded_event, ?\n]
@@ -100,13 +100,13 @@ defmodule Sentry.Envelope do
           into: header,
           do: {Atom.to_string(key), value}
 
-    {:ok, header_iodata} = json_library.encode(header)
+    {:ok, header_iodata} = Sentry.JSON.encode(header, json_library)
 
     [header_iodata, ?\n, attachment.data, ?\n]
   end
 
   defp item_to_binary(json_library, %CheckIn{} = check_in) do
-    case check_in |> CheckIn.to_map() |> json_library.encode() do
+    case check_in |> CheckIn.to_map() |> Sentry.JSON.encode(json_library) do
       {:ok, encoded_check_in} ->
         header = ~s({"type":"check_in","length":#{byte_size(encoded_check_in)}})
         [header, ?\n, encoded_check_in, ?\n]
@@ -117,7 +117,7 @@ defmodule Sentry.Envelope do
   end
 
   defp item_to_binary(json_library, %ClientReport{} = client_report) do
-    case client_report |> Map.from_struct() |> json_library.encode() do
+    case client_report |> Map.from_struct() |> Sentry.JSON.encode(json_library) do
       {:ok, encoded_client_report} ->
         header = ~s({"type":"client_report","length":#{byte_size(encoded_client_report)}})
         [header, ?\n, encoded_client_report, ?\n]

lib/sentry/json.ex

@@ -0,0 +1,33 @@
+defmodule Sentry.JSON do
+  @moduledoc false
+
+  @spec encode(term(), module()) :: {:ok, String.t()} | {:error, term()}
+  def encode(data, json_library)
+
+  if Code.ensure_loaded?(JSON) do
+    def encode(data, JSON) do
+      {:ok, JSON.encode!(data)}
+    rescue
+      error -> {:error, error}
+    end
+  end
+
+  def encode(data, json_library) do
+    json_library.encode(data)
+  end
+
+  @spec decode(binary(), module()) :: {:ok, term()} | {:error, term()}
+  def decode(binary, json_library)
+
+  if Code.ensure_loaded?(JSON) do
+    def decode(binary, JSON) do
+      {:ok, JSON.decode!(binary)}
+    rescue
+      error -> {:error, error}
+    end
+  end
+
+  def decode(binary, json_library) do
+    json_library.decode(binary)
+  end
+end

lib/sentry/transport.ex

@@ -95,7 +95,7 @@ defmodule Sentry.Transport do
   defp request(client, endpoint, headers, body) do
     with {:ok, 200, _headers, body} <-
            client_post_and_validate_return_value(client, endpoint, headers, body),
-         {:ok, json} <- Config.json_library().decode(body) do
+         {:ok, json} <- Sentry.JSON.decode(body, Config.json_library()) do
       {:ok, Map.get(json, "id")}
     else
       {:ok, 429, headers, _body} ->

pages/setup-with-plug-and-phoenix.md

@@ -51,7 +51,7 @@ defmodule MyAppWeb.ErrorView do
   def render("500.html", _assigns) do
     case Sentry.get_last_event_id_and_source() do
       {event_id, :plug} when is_binary(event_id) ->
-        opts = Jason.encode!(%{eventId: event_id})
+        opts = JSON.encode!(%{eventId: event_id})
 
         ~E"""
           <script src="https://browser.sentry-cdn.com/5.9.1/bundle.min.js" integrity="sha384-/x1aHz0nKRd6zVUazsV6CbQvjJvr6zQL2CHbQZf3yoLkezyEtZUpqUNnOLW9Nt3v" crossorigin="anonymous"></script>

test/envelope_test.exs

@@ -15,10 +15,10 @@ defmodule Sentry.EnvelopeTest do
       assert {:ok, encoded} = Envelope.to_binary(envelope)
 
       assert [id_line, header_line, event_line] = String.split(encoded, "\n", trim: true)
-      assert Jason.decode!(id_line) == %{"event_id" => event.event_id}
-      assert %{"type" => "event", "length" => _} = Jason.decode!(header_line)
+      assert decode!(id_line) == %{"event_id" => event.event_id}
+      assert %{"type" => "event", "length" => _} = decode!(header_line)
 
-      assert {:ok, decoded_event} = Jason.decode(event_line)
+      decoded_event = decode!(event_line)
       assert decoded_event["event_id"] == event.event_id
       assert decoded_event["breadcrumbs"] == []
       assert decoded_event["environment"] == "test"
@@ -65,29 +65,29 @@ defmodule Sentry.EnvelopeTest do
                "..."
              ] = String.split(encoded, "\n", trim: true)
 
-      assert %{"event_id" => _} = Jason.decode!(id_line)
+      assert %{"event_id" => _} = decode!(id_line)
 
-      assert Jason.decode!(attachment1_header) == %{
+      assert decode!(attachment1_header) == %{
                "type" => "attachment",
                "length" => 3,
                "filename" => "example.dat"
              }
 
-      assert Jason.decode!(attachment2_header) == %{
+      assert decode!(attachment2_header) == %{
                "type" => "attachment",
                "length" => 6,
                "filename" => "example.txt",
                "content_type" => "text/plain"
              }
 
-      assert Jason.decode!(attachment3_header) == %{
+      assert decode!(attachment3_header) == %{
                "type" => "attachment",
                "length" => 2,
                "filename" => "example.json",
                "content_type" => "application/json"
              }
 
-      assert Jason.decode!(attachment4_header) == %{
+      assert decode!(attachment4_header) == %{
                "type" => "attachment",
                "length" => 3,
                "filename" => "dump",
@@ -105,10 +105,10 @@ defmodule Sentry.EnvelopeTest do
       assert {:ok, encoded} = Envelope.to_binary(envelope)
 
       assert [id_line, header_line, event_line] = String.split(encoded, "\n", trim: true)
-      assert %{"event_id" => _} = Jason.decode!(id_line)
-      assert %{"type" => "check_in", "length" => _} = Jason.decode!(header_line)
+      assert %{"event_id" => _} = decode!(id_line)
+      assert %{"type" => "check_in", "length" => _} = decode!(header_line)
 
-      assert {:ok, decoded_check_in} = Jason.decode(event_line)
+      decoded_check_in = decode!(event_line)
       assert decoded_check_in["check_in_id"] == check_in_id
       assert decoded_check_in["monitor_slug"] == "test"
       assert decoded_check_in["status"] == "ok"
@@ -128,10 +128,10 @@ defmodule Sentry.EnvelopeTest do
     assert {:ok, encoded} = Envelope.to_binary(envelope)
 
     assert [id_line, header_line, event_line] = String.split(encoded, "\n", trim: true)
-    assert %{"event_id" => _} = Jason.decode!(id_line)
-    assert %{"type" => "client_report", "length" => _} = Jason.decode!(header_line)
+    assert %{"event_id" => _} = decode!(id_line)
+    assert %{"type" => "client_report", "length" => _} = decode!(header_line)
 
-    assert {:ok, decoded_client_report} = Jason.decode(event_line)
+    decoded_client_report = decode!(event_line)
     assert decoded_client_report["timestamp"] == client_report.timestamp
 
     assert decoded_client_report["discarded_events"] == [

test/plug_capture_test.exs

@@ -29,7 +29,9 @@ defmodule Sentry.PlugCaptureTest do
     use Phoenix.Endpoint, otp_app: :sentry
     use Plug.Debugger, otp_app: :sentry
 
-    plug Plug.Parsers, parsers: [:json], pass: ["*/*"], json_decoder: Jason
+    json_mod = if Code.ensure_loaded?(JSON), do: JSON, else: Jason
+
+    plug Plug.Parsers, parsers: [:json], pass: ["*/*"], json_decoder: json_mod
     plug Sentry.PlugContext
     plug PhoenixRouter
   end
@@ -45,7 +47,9 @@ defmodule Sentry.PlugCaptureTest do
     use Phoenix.Endpoint, otp_app: :sentry
     use Plug.Debugger, otp_app: :sentry
 
-    plug Plug.Parsers, parsers: [:json], pass: ["*/*"], json_decoder: Jason
+    json_mod = if Code.ensure_loaded?(JSON), do: JSON, else: Jason
+
+    plug Plug.Parsers, parsers: [:json], pass: ["*/*"], json_decoder: json_mod
     plug Sentry.PlugContext
     plug PhoenixRouter
   end

test/sentry/config_test.exs

@@ -161,7 +161,11 @@ defmodule Sentry.ConfigTest do
       assert Config.validate!(json_library: Jason)[:json_library] == Jason
 
       # Default
-      assert Config.validate!([])[:json_library] == Jason
+      if Version.match?(System.version(), "~> 1.18") do
+        assert Config.validate!([])[:json_library] == JSON
+      else
+        assert Config.validate!([])[:json_library] == Jason
+      end
 
       assert_raise ArgumentError, ~r/invalid value for :json_library option/, fn ->
         Config.validate!(json_library: Atom)

test/sentry/json_test.exs

@@ -0,0 +1,32 @@
+defmodule Sentry.JSONTest do
+  use ExUnit.Case, async: true
+
+  json_modules =
+    if Code.ensure_loaded?(JSON) do
+      [JSON, Jason]
+    else
+      [Jason]
+    end
+
+  for json_mod <- json_modules do
+    describe "decode/2 with #{inspect(json_mod)}" do
+      test "decodes empty object to empty map" do
+        assert Sentry.JSON.decode("{}", unquote(json_mod)) == {:ok, %{}}
+      end
+
+      test "returns {:error, reason} if binary is not a JSON" do
+        assert {:error, _reason} = Sentry.JSON.decode("not JSON", unquote(json_mod))
+      end
+    end
+
+    describe "encode/2 with #{inspect(json_mod)}" do
+      test "encodes empty map to empty object" do
+        assert Sentry.JSON.encode(%{}, unquote(json_mod)) == {:ok, "{}"}
+      end
+
+      test "returns {:error, reason} if data cannot be parsed to JSON" do
+        assert {:error, _reason} = Sentry.JSON.encode({:ok, "will fail"}, unquote(json_mod))
+      end
+    end
+  end
+end

test/sentry/transport_test.exs

@@ -190,11 +190,17 @@ defmodule Sentry.TransportTest do
         Plug.Conn.resp(conn, 200, ~s<invalid JSON>)
       end)
 
-      assert {:request_failure, %Jason.DecodeError{}} =
+      assert {:request_failure, error} =
                error(fn ->
                  Transport.encode_and_post_envelope(envelope, HackneyClient, _retries = [0])
                end)
 
+      if Version.match?(System.version(), "~> 1.18") do
+        assert error.__struct__ == JSON.DecodeError
+      else
+        assert error.__struct__ == Jason.DecodeError
+      end
+
       assert_received {:request, ^ref}
       assert_received {:request, ^ref}
     end

test/support/example_plug_application.ex

@@ -5,6 +5,8 @@ defmodule Sentry.ExamplePlugApplication do
 
   import ExUnit.Assertions
 
+  alias Sentry.TestHelpers
+
   plug Plug.Parsers, parsers: [:multipart, :urlencoded]
   plug Sentry.PlugContext
   plug :match
@@ -50,7 +52,7 @@ defmodule Sentry.ExamplePlugApplication do
         {event_id, :plug} ->
           opts =
             %{title: "Testing", eventId: event_id}
-            |> Jason.encode!()
+            |> TestHelpers.encode!()
 
           """
           <script src="https://browser.sentry-cdn.com/5.9.1/bundle.min.js" integrity="sha384-/x1aHz0nKRd6zVUazsV6CbQvjJvr6zQL2CHbQZf3yoLkezyEtZUpqUNnOLW9Nt3v" crossorigin="anonymous"></script>

test/support/test_error_view.ex

@@ -3,12 +3,14 @@ defmodule Sentry.ErrorView do
 
   import Phoenix.HTML, only: [raw: 1]
 
+  alias Sentry.TestHelpers
+
   def render(_, _) do
     case Sentry.get_last_event_id_and_source() do
       {event_id, :plug} ->
         opts =
           %{title: "Testing", eventId: event_id}
-          |> Jason.encode!()
+          |> TestHelpers.encode!()
 
         assigns = %{opts: opts}