Fix JSON 3 message generation

lib/protocol/websocket/coder.rb

@@ -10,7 +10,7 @@ module WebSocket
 		# @namespace
 		module Coder
 			# The default coder for WebSocket messages.
-			DEFAULT = JSON::DEFAULT
+			DEFAULT = JSON
 		end
 	end
 end

lib/protocol/websocket/coder/json.rb

@@ -9,25 +9,16 @@ module Protocol
 	module WebSocket
 		module Coder
 			# A JSON coder that uses the standard JSON library.
-			class JSON
-				# Initialize a new JSON coder.
-				# @parameter options [Hash] Options to pass to the JSON library when parsing or generating.
-				def initialize(**options)
-					@options = options
-				end
-
+			module JSON
 				# Parse a JSON buffer into an object.
-				def parse(buffer)
-					::JSON.parse(buffer, **@options)
+				def self.parse(buffer)
+					::JSON.parse(buffer, symbolize_names: true)
 				end
 
 				# Generate a JSON buffer from an object.
-				def generate(object)
-					::JSON.generate(object, **@options)
+				def self.generate(object)
+					::JSON.generate(object)
 				end
-
-				# The default JSON coder. This coder will symbolize names.
-				DEFAULT = new(symbolize_names: true)
 			end
 		end
 	end

releases.md

@@ -1,5 +1,9 @@
 # Releases
 
+## Unreleased
+
+  - Fix JSON 3 compatibility by applying `symbolize_names` only when parsing incoming messages. `Coder::JSON` is now a module with fixed parsing and generation behavior; pass a different coder to customize serialization.
+
 ## v0.21.1
 
   - If `Connection#close_write` fails, the connection will now be fully closed to prevent hanging connections.

test/protocol/websocket/coder/json.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+# Released under the MIT License.
+# Copyright, 2026, by Samuel Williams.
+
+require "protocol/websocket/coder/json"
+
+describe Protocol::WebSocket::Coder::JSON do
+	let(:buffer) {'{"hello":"world"}'}
+	let(:object) {{hello: "world"}}
+
+	it "parses object keys as symbols" do
+		expect(subject.parse(buffer)).to be == object
+	end
+
+	it "generates JSON" do
+		expect(subject.generate(object)).to be == buffer
+	end
+end