diff --git a/.rubocop.yml b/.rubocop.yml
index da083ed..c8fd5f5 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -8,6 +8,8 @@ AllCops:
   TargetRubyVersion: 3.3
   DisplayCopNames: true
   NewCops: enable
+  Exclude:
+    - docs/**/*
 
 # ----------------------- Gemspec -----------------------
 
diff --git a/adr/0003-logging-methods-vs-logger-class.md b/adr/0003-logging-methods-vs-logger-class.md
new file mode 100644
index 0000000..9c4d778
--- /dev/null
+++ b/adr/0003-logging-methods-vs-logger-class.md
@@ -0,0 +1,122 @@
+# 3. Logging methods vs logger class
+
+Date: 2024-03-19
+
+## Status
+
+Accepted
+
+## Context
+
+I'm deciding between integrating logging directly into the main class or creating a dedicated logger class.
+
+### Option 1: Logging methods
+
+The first approach weaves logging actions into the operational code, resulting in a tight coupling of functionality and
+logging. Classes should be open for extension but closed for modification, and this strategy violates that principle.
+
+```ruby
+class Client
+  def connect(relay)
+    execute_within_an_em_thread do
+      client = build_websocket_client(relay.url)
+      parent_to_child_channel.subscribe do |msg|
+        client.send(msg)
+        emit(:send, msg)
+        log_send(msg) # <------ new code
+      end
+
+      client.on :open do
+        child_to_parent_channel.push(type: :open, relay:)
+        log_connection_opened(relay) # <------ new code
+      end
+
+      client.on :message do |event|
+        child_to_parent_channel.push(type: :message, data: event.data)
+        log_message_received(event.data) # <------ new code
+      end
+
+      client.on :error do |event|
+        child_to_parent_channel.push(type: :error, message: event.message)
+        log_error(event.message) # <------ new code
+      end
+
+      client.on :close do |event|
+        child_to_parent_channel.push(type: :close, code: event.code, reason: event.reason)
+        log_connection_closed(event.code, event.reason) # <------ new code
+      end
+    end
+
+    # ------ new code below ------
+
+    def log_send(msg)
+      logger.info("Message sent: #{msg}")
+    end
+
+    def log_connection_opened(relay)
+      logger.info("Connection opened to #{relay.url}")
+    end
+
+    def log_message_received(data)
+      logger.info("Message received: #{data}")
+    end
+
+    def log_error(message)
+      logger.error("Error: #{message}")
+    end
+
+    def log_connection_closed(code, reason)
+      logger.info("Connection closed with code: #{code}, reason: #{reason}")
+    end
+  end
+end
+```
+
+### Option 2: Logger class
+
+The second strategy separates logging into its own class, promoting cleaner code and adherence to the Single
+Responsibility Principle. Client already exposes events that can be tapped into, so the logger class can listen to these
+events and log accordingly.
+
+```ruby
+class ClientLogger
+  def attach_to(client)
+    logger_instance = self
+
+    client.on(:connect) { |relay| logger_instance.on_connect(relay) }
+    client.on(:message) { |message| logger_instance.on_message(message) }
+    client.on(:send) { |message| logger_instance.on_send(message) }
+    client.on(:error) { |message| logger_instance.on_error(message) }
+    client.on(:close) { |code, reason| logger_instance.on_close(code, reason) }
+  end
+
+  def on_connect(relay); end
+  def on_message(message); end
+  def on_send(message); end
+  def on_error(message); end
+  def on_close(code, reason); end
+end
+
+client = Nostr::Client.new
+logger = Nostr::ClientLogger.new
+logger.attach_to(client)
+```
+
+This approach decouples logging from the main class, making it easier to maintain and extend the logging system without
+affecting the core logic.
+
+## Decision
+
+I've chosen the dedicated logger class route. This choice is driven by a desire for extensibility in the logging system.
+With a separate logger, I can easily modify logging behavior—like changing formats, adjusting verbosity levels,
+switching colors, or altering output destinations (files, networks, etc.) — without needing to rewrite any of the main
+operational code.
+
+## Consequences
+
+Adopting a dedicated logger class offers greater flexibility and simplifies maintenance, making it straightforward to
+adjust how and what I log independently of the core logic. This separation of concerns means that any future changes
+to logging preferences or requirements can be implemented quickly and without risk to the main class's functionality.
+However, it's important to manage the integration carefully to avoid introducing complexity, such as handling
+dependencies and ensuring seamless communication between the main operations and the logging system.
+
diff --git a/adr/0004-default-logging-activation.md b/adr/0004-default-logging-activation.md
new file mode 100644
index 0000000..b49faa6
--- /dev/null
+++ b/adr/0004-default-logging-activation.md
@@ -0,0 +1,66 @@
+# 3. Default Logging Activation
+
+Date: 2024-03-19
+
+## Status
+
+Accepted
+
+## Context
+
+Logging provides visibility into the gem's behavior and helps to diagnose issues. The decision centered on whether
+to enable logging by default or require manual activation.
+
+### Option 1: On-demand Logging
+
+```ruby
+client = Nostr::Client.new
+logger = Nostr::ClientLogger.new
+logger.attach_to(client)
+```
+
+#### Advantages:
+
+- Offers users flexibility and control over logging.
+- Conserves resources by logging only when needed.
+
+#### Disadvantages:
+
+- Potential to miss critical logs if not enabled.
+- Requires users to read and understand documentation to enable logging.
+- Requires users to manually activate and configure logging.
+
+### Option 2: Automatic Logging
+
+```ruby
+class Client
+  def initialize(logger: ClientLogger.new)
+    @logger = logger
+    logger&.attach_to(self)
+  end
+end
+
+client = Nostr::Client.new
+```
+
+#### Advantages:
+
+- Ensures comprehensive logging without user intervention.
+- Simplifies debugging and monitoring.
+- Balances logging detail with performance impact.
+
+#### Disadvantages:
+
+- Needs additional steps to disable logging.
+
+## Decision
+
+Logging will be enabled by default. Users can disable logging by passing a `nil` logger to the client:
+
+```ruby
+client = Nostr::Client.new(logger: nil)
+```
+
+## Consequences
+
+Enabling logging by default favors ease of use and simplifies the developer's experience.
diff --git a/adr/0005-logger-types.md b/adr/0005-logger-types.md
new file mode 100644
index 0000000..a1d9722
--- /dev/null
+++ b/adr/0005-logger-types.md
@@ -0,0 +1,32 @@
+# 3. Logger Types
+
+Date: 2024-04-01
+
+## Status
+
+Accepted
+
+## Context
+
+In developing the `Nostr::Client` logging mechanism, I identified a need to cater to multiple development environments
+and developer preferences. The consideration was whether to implement a singular logger type or to introduce
+multiple, specialized loggers. The alternatives were:
+
+- A single `ClientLogger` providing a one-size-fits-all solution.
+- Multiple logger types:
+  - `Nostr::Client::Logger`: The base class for logging, providing core functionalities.
+  - `Nostr::Client::ColorLogger`: An extension of the base logger, introducing color-coded outputs for enhanced readability in environments that support ANSI colors.
+  - `Nostr::Client::PlainLogger`: A variation that produces logs without color coding, suitable for environments lacking color support or for users preferring plain text.
+
+## Decision
+
+I decided to implement the latter option: three specific kinds of loggers (`Nostr::Client::Logger`,
+`Nostr::Client::ColorLogger`, and `Nostr::Client::PlainLogger`). This approach is intended to offer flexibility and
+cater to the varied preferences and requirements of our users, recognizing the diverse environments in which our
+library might be used.
+
+## Consequences
+
+- `Developer Choice`: Developers gain the ability to select the one that best matches their needs and environmental constraints, thereby enhancing the library's usability.
+- `Code Complexity`: While introducing multiple logger types increases the library's code complexity, this is offset by the significant gain in flexibility and user satisfaction.
+- `Broad Compatibility`: This decision ensures that the logging mechanism is adaptable to a wide range of operational environments, enhancing the library's overall robustness and accessibility.
diff --git a/docs/.vitepress/config.mjs b/docs/.vitepress/config.mjs
index 4e85f84..f93ff2c 100644
--- a/docs/.vitepress/config.mjs
+++ b/docs/.vitepress/config.mjs
@@ -78,6 +78,7 @@ export default defineConfig(withMermaid({
         text: 'Common use cases',
         collapsed: false,
         items: [
+          { text: 'Logging and debugging', link: '/common-use-cases/logging-and-debugging' },
           { text: 'Bech32 enc/decoding (NIP-19)', link: '/common-use-cases/bech32-encoding-and-decoding-(NIP-19)' },
           { text: 'Signing/verifying messages', link: '/common-use-cases/signing-and-verifying-messages' },
           { text: 'Signing/verifying events', link: '/common-use-cases/signing-and-verifying-events' },
diff --git a/docs/common-use-cases/logging-and-debugging.md b/docs/common-use-cases/logging-and-debugging.md
new file mode 100644
index 0000000..bbfc205
--- /dev/null
+++ b/docs/common-use-cases/logging-and-debugging.md
@@ -0,0 +1,60 @@
+# Logging and debugging
+
+The `Nostr::Client` class provides built-in logging functionality to help you debug and monitor client interactions with
+relays. By default, the client uses the `ColorLogger`, which logs events in color. However, you can customize the
+logging behavior or disable it entirely.
+
+## Disabling logging
+
+To instantiate a client without any logging, simply pass `logger: nil` when creating the client instance:
+
+```ruby
+client = Nostr::Client.new(logger: nil)
+```
+
+This will disable all logging for the client.
+
+## Formatting the logging
+
+The `Nostr::Client::Logger` class is the base class for logging functionality. It defines the following methods for
+logging different events:
+
+- `on_connect(relay)`: Logs when the client connects to a relay.
+- `on_message(message)`: Logs a message received from the relay.
+- `on_send(message)`: Logs a message sent to the relay.
+- `on_error(message)`: Logs an error message.
+- `on_close(code, reason)`: Logs when the connection with a relay is closed.
+
+You can create your own logger by subclassing `Nostr::Client::Logger` and overriding these methods to customize the
+logging format.
+
+The `Nostr::Client::ColorLogger` is a built-in logger that logs events in color. It uses ANSI escape codes to add color
+to the log output. Here's an example of how the ColorLogger formats the log messages:
+
+- Connection: `"\u001b[32m\u001b[1mConnected to the relay\u001b[22m #{relay.name} (#{relay.url})\u001b[0m"`
+- Message received: `"\u001b[32m\u001b[1m◄-\u001b[0m #{message}"`
+- Message sent: `"\u001b[32m\u001b[1m-►\u001b[0m #{message}"`
+- Error: `"\u001b[31m\u001b[1mError: \u001b[22m#{message}\u001b[0m"`
+- Connection closed: `"\u001b[31m\u001b[1mConnection closed: \u001b[22m#{reason} (##{code})\u001b[0m"`
+
+## Plain text logging
+
+If you prefer plain text logging without colors, you can use the `Nostr::Client::PlainLogger`. This logger formats the
+log messages in a simple, readable format without any ANSI escape codes.
+
+To use the `PlainLogger`, pass it as the `logger` option when creating the client instance:
+
+```ruby
+client = Nostr::Client.new(logger: Nostr::Client::PlainLogger.new)
+```
+
+The `PlainLogger` formats the log messages as follows:
+
+- Connection: `"Connected to the relay #{relay.name} (#{relay.url})"`
+- Message received: `"◄- #{message}"`
+- Message sent: `"-► #{message}"`
+- Error: `"Error: #{message}"`
+- Connection closed: `"Connection closed: #{reason} (##{code})"`
+
+By using the appropriate logger or creating your own custom logger, you can effectively debug and monitor your Nostr
+client's interactions with relays.
diff --git a/lib/nostr.rb b/lib/nostr.rb
index 2e2f712..954aebb 100644
--- a/lib/nostr.rb
+++ b/lib/nostr.rb
@@ -16,6 +16,8 @@ require_relative 'nostr/signature'
 require_relative 'nostr/event'
 require_relative 'nostr/events/encrypted_direct_message'
 require_relative 'nostr/client'
+require_relative 'nostr/client/logger'
+require_relative 'nostr/client/color_logger'
 require_relative 'nostr/user'
 require_relative 'nostr/key'
 require_relative 'nostr/private_key'
diff --git a/lib/nostr/client.rb b/lib/nostr/client.rb
index 5b5bafb..be75b86 100644
--- a/lib/nostr/client.rb
+++ b/lib/nostr/client.rb
@@ -18,11 +18,19 @@ module Nostr
     # @api public
     #
     # @example Instantiating a client that logs all the events it sends and receives
-    #   client = Nostr::Client.new(debug: true)
+    #   client = Nostr::Client.new
     #
-    def initialize
+    # @example Instantiating a client with no logging
+    #   client = Nostr::Client.new(logger: nil)
+    #
+    # @example Instantiating a client with your own logger
+    #   client = Nostr::Client.new(logger: YourLogger.new)
+    #
+    def initialize(logger: ColorLogger.new)
       @subscriptions = {}
+      @logger = logger
 
+      logger&.attach_to(self)
       initialize_channels
     end
 
@@ -122,6 +130,14 @@ module Nostr
 
     private
 
+    # The logger that prints all the events that the client sends and receives
+    #
+    # @api private
+    #
+    # @return [ClientLogger]
+    #
+    attr_reader :logger
+
     # The subscriptions that the client has created
     #
     # @api private
diff --git a/lib/nostr/client/color_logger.rb b/lib/nostr/client/color_logger.rb
new file mode 100644
index 0000000..54d36ea
--- /dev/null
+++ b/lib/nostr/client/color_logger.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+module Nostr
+  class Client
+    # Logs connection events, messages sent and received, errors, and connection closures in color.
+    class ColorLogger < Logger
+      # Logs connection to a relay
+      #
+      # @api private
+      #
+      # @param [Nostr::Relay] relay The relay the client connected to.
+      #
+      # @return [void]
+      #
+      def on_connect(relay)
+        puts "\u001b[32m\u001b[1mConnected to the relay\u001b[22m #{relay.name} (#{relay.url})\u001b[0m"
+      end
+
+      # Logs a message received from the relay
+      #
+      # @api private
+      #
+      # @param [String] message The message received.
+      #
+      # @return [void]
+      #
+      def on_message(message)
+        puts "\u001b[32m\u001b[1m◄-\u001b[0m #{message}"
+      end
+
+      # Logs a message sent to the relay
+      #
+      # @api private
+      #
+      # @param [String] message The message sent.
+      #
+      # @return [void]
+      #
+      def on_send(message)
+        puts "\u001b[32m\u001b[1m-►\u001b[0m #{message}"
+      end
+
+      # Logs an error message
+      #
+      # @api private
+      #
+      # @param [String] message The error message.
+      #
+      # @return [void]
+      #
+      def on_error(message)
+        puts "\u001b[31m\u001b[1mError: \u001b[22m#{message}\u001b[0m"
+      end
+
+      # Logs a closure of connection with a relay
+      #
+      # @api private
+      #
+      # @param [String] code The closure code.
+      # @param [String] reason The reason for the closure.
+      #
+      # @return [void]
+      #
+      def on_close(code, reason)
+        puts "\u001b[31m\u001b[1mConnection closed: \u001b[22m#{reason} (##{code})\u001b[0m"
+      end
+    end
+  end
+end
diff --git a/lib/nostr/client/logger.rb b/lib/nostr/client/logger.rb
new file mode 100644
index 0000000..ab02f45
--- /dev/null
+++ b/lib/nostr/client/logger.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+module Nostr
+  class Client
+    # Logs connection events, messages sent and received, errors, and connection closures.
+    class Logger
+      # Attaches event handlers to the specified Nostr client for logging purposes
+      #
+      # @api public
+      #
+      # @example Attaching the logger to a client
+      #   client = Nostr::Client.new
+      #   logger = Nostr::Client::Logger.new
+      #   logger.attach_to(client)
+      #
+      #   # Now, actions like connecting, sending messages, receiving messages,
+      #   # errors, and closing the connection will be logged to the console.
+      #
+      # @param [Nostr::Client] client The client to attach logging functionality to.
+      #
+      # @return [void]
+      #
+      def attach_to(client)
+        logger_instance = self
+
+        client.on(:connect) { |relay| logger_instance.on_connect(relay) }
+        client.on(:message) { |message| logger_instance.on_message(message) }
+        client.on(:send) { |message| logger_instance.on_send(message) }
+        client.on(:error) { |message| logger_instance.on_error(message) }
+        client.on(:close) { |code, reason| logger_instance.on_close(code, reason) }
+      end
+
+      # Logs connection to a relay
+      #
+      # @api private
+      #
+      # @param [Nostr::Relay] relay The relay the client connected to.
+      #
+      # @return [void]
+      #
+      def on_connect(relay); end
+
+      # Logs a message received from the relay
+      #
+      # @api private
+      #
+      # @param [String] message The message received.
+      #
+      # @return [void]
+      #
+      def on_message(message); end
+
+      # Logs a message sent to the relay
+      #
+      # @api private
+      #
+      # @param [String] message The message sent.
+      #
+      # @return [void]
+      #
+      def on_send(message); end
+
+      # Logs an error message
+      #
+      # @api private
+      #
+      # @param [String] message The error message.
+      #
+      # @return [void]
+      #
+      def on_error(message); end
+
+      # Logs a closure of connection with a relay
+      #
+      # @api private
+      #
+      # @param [String] code The closure code.
+      # @param [String] reason The reason for the closure.
+      #
+      # @return [void]
+      #
+      def on_close(code, reason); end
+    end
+  end
+end
diff --git a/lib/nostr/client/plain_logger.rb b/lib/nostr/client/plain_logger.rb
new file mode 100644
index 0000000..db73363
--- /dev/null
+++ b/lib/nostr/client/plain_logger.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+module Nostr
+  class Client
+    # Logs connection events, messages sent and received, errors, and connection closures.
+    class PlainLogger < Logger
+      # Logs connection to a relay
+      #
+      # @api private
+      #
+      # @param [Nostr::Relay] relay The relay the client connected to.
+      #
+      # @return [void]
+      #
+      def on_connect(relay)
+        puts "Connected to the relay #{relay.name} (#{relay.url})"
+      end
+
+      # Logs a message received from the relay
+      #
+      # @api private
+      #
+      # @param [String] message The message received.
+      #
+      # @return [void]
+      #
+      def on_message(message)
+        puts "◄- #{message}"
+      end
+
+      # Logs a message sent to the relay
+      #
+      # @api private
+      #
+      # @param [String] message The message sent.
+      #
+      # @return [void]
+      #
+      def on_send(message)
+        puts "-► #{message}"
+      end
+
+      # Logs an error message
+      #
+      # @api private
+      #
+      # @param [String] message The error message.
+      #
+      # @return [void]
+      #
+      def on_error(message)
+        puts "Error: #{message}"
+      end
+
+      # Logs a closure of connection with a relay
+      #
+      # @api private
+      #
+      # @param [String] code The closure code.
+      # @param [String] reason The reason for the closure.
+      #
+      # @return [void]
+      #
+      def on_close(code, reason)
+        puts "Connection closed: #{reason} (##{code})"
+      end
+    end
+  end
+end
diff --git a/sig/nostr/client.rbs b/sig/nostr/client.rbs
index c2dc656..687ff1b 100644
--- a/sig/nostr/client.rbs
+++ b/sig/nostr/client.rbs
@@ -10,6 +10,7 @@ module Nostr
 
     private
 
+    attr_reader logger: Logger
     attr_reader subscriptions: Hash[String, Subscription]
     attr_reader parent_to_child_channel: EventMachine::Channel
     attr_reader child_to_parent_channel: EventMachine::Channel
diff --git a/sig/nostr/client/color_logger.rbs b/sig/nostr/client/color_logger.rbs
new file mode 100644
index 0000000..f3b5841
--- /dev/null
+++ b/sig/nostr/client/color_logger.rbs
@@ -0,0 +1,6 @@
+module Nostr
+  class Client
+    class ColorLogger < Logger
+    end
+  end
+end
diff --git a/sig/nostr/client/logger.rbs b/sig/nostr/client/logger.rbs
new file mode 100644
index 0000000..925e011
--- /dev/null
+++ b/sig/nostr/client/logger.rbs
@@ -0,0 +1,12 @@
+module Nostr
+  class Client
+    class Logger
+      def attach_to: (Client client) -> void
+      def on_connect: (Relay relay) -> void
+      def on_message: (String message) -> void
+      def on_send: (String message) -> void
+      def on_error: (String message) -> void
+      def on_close: (String code, String reason) -> void
+    end
+  end
+end
diff --git a/sig/nostr/client/plain_logger.rbs b/sig/nostr/client/plain_logger.rbs
new file mode 100644
index 0000000..fc25442
--- /dev/null
+++ b/sig/nostr/client/plain_logger.rbs
@@ -0,0 +1,6 @@
+module Nostr
+  class Client
+    class PlainLogger < Logger
+    end
+  end
+end
diff --git a/spec/nostr/client/color_logger_spec.rb b/spec/nostr/client/color_logger_spec.rb
new file mode 100644
index 0000000..dc79d95
--- /dev/null
+++ b/spec/nostr/client/color_logger_spec.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Nostr::Client::ColorLogger do
+  let(:client) { instance_spy(Nostr::Client) }
+  let(:relay) { Nostr::Relay.new(url: 'ws://0.0.0.0:4180/', name: 'localhost') }
+  let(:logger) { described_class.new }
+
+  describe '#attach_to' do
+    it 'attaches event handlers to the client' do
+      logger.attach_to(client)
+
+      aggregate_failures do
+        expect(client).to have_received(:on).with(:connect)
+        expect(client).to have_received(:on).with(:message)
+        expect(client).to have_received(:on).with(:send)
+        expect(client).to have_received(:on).with(:error)
+        expect(client).to have_received(:on).with(:close)
+      end
+    end
+  end
+
+  describe '#on_connect' do
+    it 'logs connection to a relay' do
+      expect do
+        logger.on_connect(relay)
+      end.to output("\e[32m\e[1mConnected to the relay\e[22m localhost (ws://0.0.0.0:4180/)\e[0m\n").to_stdout
+    end
+  end
+
+  describe '#on_message' do
+    it 'logs a message received from the relay' do
+      message = 'Received message'
+      expect { logger.on_message(message) }.to output("\e[32m\e[1m◄-\e[0m #{message}\n").to_stdout
+    end
+  end
+
+  describe '#on_send' do
+    it 'logs a message sent to the relay' do
+      message = 'Sent message'
+      expect { logger.on_send(message) }.to output("\e[32m\e[1m-►\e[0m #{message}\n").to_stdout
+    end
+  end
+
+  describe '#on_error' do
+    it 'logs an error message' do
+      message = 'Error message'
+      expect { logger.on_error(message) }.to output("\e[31m\e[1mError: \e[22m#{message}\e[0m\n").to_stdout
+    end
+  end
+
+  describe '#on_close' do
+    it 'logs a closure of connection with a relay' do
+      code = '1000'
+      reason = 'Connection closed'
+      expect do
+        logger.on_close(code, reason)
+      end.to output("\e[31m\e[1mConnection closed: \e[22m#{reason} (##{code})\e[0m\n").to_stdout
+    end
+  end
+end
diff --git a/spec/nostr/client/logger_spec.rb b/spec/nostr/client/logger_spec.rb
new file mode 100644
index 0000000..0747d5d
--- /dev/null
+++ b/spec/nostr/client/logger_spec.rb
@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Nostr::Client::Logger do
+  let(:client) { instance_spy(Nostr::Client) }
+  let(:relay) { Nostr::Relay.new(url: 'ws://0.0.0.0:4180/', name: 'localhost') }
+  let(:logger) { described_class.new }
+
+  describe '#attach_to' do
+    it 'attaches event handlers to the client' do
+      logger.attach_to(client)
+
+      aggregate_failures do
+        expect(client).to have_received(:on).with(:connect)
+        expect(client).to have_received(:on).with(:message)
+        expect(client).to have_received(:on).with(:send)
+        expect(client).to have_received(:on).with(:error)
+        expect(client).to have_received(:on).with(:close)
+      end
+    end
+  end
+
+  describe '#on_connect' do
+    it 'returns nil' do
+      expect(logger.on_connect(relay)).to be_nil
+    end
+  end
+
+  describe '#on_message' do
+    it 'returns nil' do
+      message = 'Received message'
+      expect(logger.on_message(message)).to be_nil
+    end
+  end
+
+  describe '#on_send' do
+    it 'returns nil' do
+      message = 'Sent message'
+      expect(logger.on_send(message)).to be_nil
+    end
+  end
+
+  describe '#on_error' do
+    it 'returns nil' do
+      message = 'Error message'
+      expect(logger.on_error(message)).to be_nil
+    end
+  end
+
+  describe '#on_close' do
+    it 'returns nil' do
+      code = 1000
+      reason = 'Normal closure'
+      expect(logger.on_close(code, reason)).to be_nil
+    end
+  end
+end
diff --git a/spec/nostr/client/plain_logger_spec.rb b/spec/nostr/client/plain_logger_spec.rb
new file mode 100644
index 0000000..8045825
--- /dev/null
+++ b/spec/nostr/client/plain_logger_spec.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'nostr/client/plain_logger'
+
+RSpec.describe Nostr::Client::PlainLogger do
+  let(:client) { instance_spy(Nostr::Client) }
+  let(:relay) { Nostr::Relay.new(url: 'ws://0.0.0.0:4180/', name: 'localhost') }
+  let(:logger) { described_class.new }
+
+  describe '#attach_to' do
+    it 'attaches event handlers to the client' do
+      logger.attach_to(client)
+
+      aggregate_failures do
+        expect(client).to have_received(:on).with(:connect)
+        expect(client).to have_received(:on).with(:message)
+        expect(client).to have_received(:on).with(:send)
+        expect(client).to have_received(:on).with(:error)
+        expect(client).to have_received(:on).with(:close)
+      end
+    end
+  end
+
+  describe '#on_connect' do
+    it 'logs connection to a relay' do
+      expect do
+        logger.on_connect(relay)
+      end.to output("Connected to the relay localhost (ws://0.0.0.0:4180/)\n").to_stdout
+    end
+  end
+
+  describe '#on_message' do
+    it 'logs a message received from the relay' do
+      message = 'Received message'
+      expect { logger.on_message(message) }.to output("◄- #{message}\n").to_stdout
+    end
+  end
+
+  describe '#on_send' do
+    it 'logs a message sent to the relay' do
+      message = 'Sent message'
+      expect { logger.on_send(message) }.to output("-► #{message}\n").to_stdout
+    end
+  end
+
+  describe '#on_error' do
+    it 'logs an error message' do
+      message = 'Error message'
+      expect { logger.on_error(message) }.to output("Error: #{message}\n").to_stdout
+    end
+  end
+
+  describe '#on_close' do
+    it 'logs a closure of connection with a relay' do
+      code = '1000'
+      reason = 'Connection closed'
+      expect do
+        logger.on_close(code, reason)
+      end.to output("Connection closed: #{reason} (##{code})\n").to_stdout
+    end
+  end
+end
diff --git a/spec/nostr/client_spec.rb b/spec/nostr/client_spec.rb
index d5f64aa..1b18e62 100644
--- a/spec/nostr/client_spec.rb
+++ b/spec/nostr/client_spec.rb
@@ -17,7 +17,7 @@ RSpec.describe Nostr::Client do
     @echo_server.stop
   end
 
-  let(:client) { described_class.new }
+  let(:client) { described_class.new(logger: nil) }
   let(:relay)  { Nostr::Relay.new(url: plain_text_url, name: 'localhost') }
 
   let(:port)           { 4180 }
@@ -27,8 +27,8 @@ RSpec.describe Nostr::Client do
   after  { stop }
 
   describe '.new' do
-      client = described_class.new
     it 'creates an instance of a client' do
+      client = described_class.new(logger: nil)
 
       expect(client).to be_an_instance_of(described_class)
     end
@@ -134,7 +134,7 @@ RSpec.describe Nostr::Client do
       it 'sends a REQ message to the relay, asking for all events and returns a subscription with the same id' do
         id = '16605b59b539f6e86762f28fb57db2fd'
 
-        client = described_class.new
+        client = described_class.new(logger: nil)
 
         sent_message = nil
         subscription = nil
@@ -164,7 +164,7 @@ RSpec.describe Nostr::Client do
         allow(SecureRandom).to receive(:hex).and_return('16605b59b539f6e86762f28fb57db2fd')
         filter = Nostr::Filter.new(since: 1_230_981_305)
 
-        client = described_class.new
+        client = described_class.new(logger: nil)
 
         sent_message = nil
         subscription = nil
@@ -194,7 +194,7 @@ RSpec.describe Nostr::Client do
         id = '16605b59b539f6e86762f28fb57db2fd'
         filter = Nostr::Filter.new(since: 1_230_981_305)
 
-        client = described_class.new
+        client = described_class.new(logger: nil)
 
         sent_message = nil
         subscription = nil
@@ -223,7 +223,7 @@ RSpec.describe Nostr::Client do
       it 'sends a REQ message to the relay, asking for all events and returns a subscription with a random id' do
         allow(SecureRandom).to receive(:hex).and_return('16605b59b539f6e86762f28fb57db2fd')
 
-        client = described_class.new
+        client = described_class.new(logger: nil)
 
         sent_message = nil
         subscription = nil
@@ -253,7 +253,7 @@ RSpec.describe Nostr::Client do
     it 'sends a CLOSE message to the relay, asking it to stop a subscription' do
       subscription_id = '16605b59b539f6e86762f28fb57db2fd'
 
-      client = described_class.new
+      client = described_class.new(logger: nil)
 
       sent_message = nil
 
@@ -277,7 +277,7 @@ RSpec.describe Nostr::Client do
   describe '#publish' do
     it 'sends a message to the relay' do
       relay = Nostr::Relay.new(url: plain_text_url, name: 'localhost')
-      client = described_class.new
+      client = described_class.new(logger: nil)
       event = Nostr::Event.new(
         id: '2a3184512d34077601e992ba3c3215354b21a8c76f85c2c7f66093481854e811',
         pubkey: '2d7661527d573cc8e84f665fa971dd969ba51e2526df00c149ff8e40a58f9558',