diff --git a/src/auth_handler.cr b/src/auth_handler.cr
index d6c8887..d6633d7 100644
--- a/src/auth_handler.cr
+++ b/src/auth_handler.cr
@@ -3,9 +3,7 @@ require "./storage"
 require "./util"
 
 class AuthHandler < Kemal::Handler
-	property storage : Storage
-
-	def initialize(@storage)
+	def initialize(@storage : Storage)
 	end
 
 	def call(env)
@@ -18,7 +16,7 @@ class AuthHandler < Kemal::Handler
 		end
 
 		if request_path_startswith env, ["/admin", "/api/admin"]
-			unless storage.verify_admin cookie.value
+			unless @storage.verify_admin cookie.value
 				env.response.status_code = 403
 			end
 		end
diff --git a/src/config.cr b/src/config.cr
index 44f7d6b..4f4bc41 100644
--- a/src/config.cr
+++ b/src/config.cr
@@ -4,17 +4,22 @@ class Config
 	include YAML::Serializable
 
 	@[YAML::Field(key: "port")]
-	property port = 9000
+	property port : Int32 = 9000
 
 	@[YAML::Field(key: "library_path")]
-	property library_path = File.expand_path "~/mango/library", home: true
+	property library_path : String = \
+		File.expand_path "~/mango/library", home: true
 
 	@[YAML::Field(key: "db_path")]
-	property db_path = File.expand_path "~/mango/mango.db", home: true
+	property db_path : String = \
+		File.expand_path "~/mango/mango.db", home: true
 
 	@[YAML::Field(key: "scan_interval_minutes")]
 	property scan_interval : Int32 = 5
 
+	@[YAML::Field(key: "log_level")]
+	property log_level : String = "info"
+
 	def self.load
 		cfg_path = File.expand_path "~/.config/mango/config.yml", home: true
 		if File.exists? cfg_path
diff --git a/src/context.cr b/src/context.cr
index 578060d..e0f34ac 100644
--- a/src/context.cr
+++ b/src/context.cr
@@ -1,17 +1,20 @@
 require "./config"
 require "./library"
 require "./storage"
-require "logger"
+require "./logger"
 
 class Context
 	property config : Config
 	property library : Library
 	property storage : Storage
+	property logger : MLogger
 
-	def initialize
-		@config = Config.load
-		@library = Library.new @config.library_path, @config.scan_interval
-		@storage = Storage.new @config.db_path
+	def initialize(@config, @logger, @library, @storage)
 	end
 
+	{% for lvl in LEVELS %}
+		def {{lvl.id}}(msg)
+			@logger.{{lvl.id}} msg
+		end
+	{% end %}
 end
diff --git a/src/library.cr b/src/library.cr
index 7654648..c527801 100644
--- a/src/library.cr
+++ b/src/library.cr
@@ -7,18 +7,12 @@ class Image
 	property mime : String
 	property filename : String
 	property size : Int32
+
 	def initialize(@data, @mime, @filename, @size)
 	end
 end
 
 class Entry
-	property zip_path : String
-	property book_title : String
-	property title : String
-	property size : String
-	property pages : Int32
-	property cover_url : String
-
 	JSON.mapping zip_path: String, book_title: String, title: String, \
 		size: String, pages: Int32, cover_url: String
 
@@ -144,7 +138,7 @@ end
 class Library
 	JSON.mapping dir: String, titles: Array(Title), scan_interval: Int32
 
-	def initialize(@dir, @scan_interval)
+	def initialize(@dir, @scan_interval, logger)
 		# explicitly initialize @titles to bypass the compiler check. it will
 		#	be filled with actual Titles in the `scan` call below
 		@titles = [] of Title
@@ -152,11 +146,11 @@ class Library
 		return scan if @scan_interval < 1
 		spawn do
 			loop do
+				logger.info "Starting periodic scan"
 				start = Time.local
-				puts "#{start} Starting periodic scan"
 				scan
 				ms = (Time.local - start).total_milliseconds
-				puts "Scanned #{@titles.size} titles in #{ms}ms"
+				logger.info "Scanned #{@titles.size} titles in #{ms}ms"
 				sleep @scan_interval * 60
 			end
 		end
diff --git a/src/log_handler.cr b/src/log_handler.cr
new file mode 100644
index 0000000..4990c7f
--- /dev/null
+++ b/src/log_handler.cr
@@ -0,0 +1,26 @@
+require "kemal"
+require "./logger"
+
+class LogHandler < Kemal::BaseLogHandler
+	def initialize(@logger : MLogger)
+	end
+
+	def call(env)
+		elapsed_time = Time.measure { call_next env }
+		elapsed_text = elapsed_text elapsed_time
+		msg = "#{env.response.status_code} #{env.request.method}" \
+			" #{env.request.resource} #{elapsed_text}"
+		@logger.debug(msg)
+		env
+	end
+
+	def write(msg)
+		@logger.debug(msg)
+	end
+
+	private def elapsed_text(elapsed)
+		millis = elapsed.total_milliseconds
+		return "#{millis.round(2)}ms" if millis >= 1
+		"#{(millis * 1000).round(2)}µs"
+	end
+end
diff --git a/src/logger.cr b/src/logger.cr
new file mode 100644
index 0000000..53c4af8
--- /dev/null
+++ b/src/logger.cr
@@ -0,0 +1,55 @@
+require "./config"
+require "logger"
+require "colorize"
+
+LEVELS = ["debug", "error", "fatal", "info", "warn"]
+COLORS = [:light_cyan, :light_red, :red, :light_yellow, :light_magenta]
+
+class MLogger
+	def initialize(config : Config)
+		@logger = Logger.new STDOUT
+
+		@log_off = false
+		log_level = config.log_level
+		if log_level == "off"
+			@log_off = true
+			return
+		end
+
+		{% begin %}
+			case log_level
+				{% for lvl in LEVELS %}
+				when {{lvl}}
+					@logger.level = Logger::{{lvl.upcase.id}}
+				{% end %}
+			else
+				raise "Unknown log level #{log_level}"
+			end
+		{% end %}
+
+		@logger.formatter = Logger::Formatter.new do \
+			|severity, datetime, progname, message, io|
+
+			color = :default
+			{% begin %}
+				case severity.to_s().downcase
+					{% for lvl, i in LEVELS %}
+					when {{lvl}}
+						color = COLORS[{{i}}]
+					{% end %}
+				end
+			{% end %}
+
+			io << "[#{severity}]".ljust(8).colorize(color)
+			io << datetime.to_s("%Y/%m/%d %H:%M:%S") << " | "
+			io << message
+		end
+	end
+
+	{% for lvl in LEVELS %}
+		def {{lvl.id}}(msg)
+			return if @log_off
+			@logger.{{lvl.id}} msg
+		end
+	{% end %}
+end
diff --git a/src/mango.cr b/src/mango.cr
index 6579e8a..66c082c 100644
--- a/src/mango.cr
+++ b/src/mango.cr
@@ -1,6 +1,16 @@
 require "./server"
 require "./context"
+require "./config"
+require "./library"
+require "./storage"
+require "./logger"
+
+config = Config.load
+logger = MLogger.new config
+library = Library.new config.library_path, config.scan_interval, logger
+storage = Storage.new config.db_path, logger
+
+context = Context.new config, logger, library, storage
 
-context = Context.new
 server = Server.new context
 server.start
diff --git a/src/server.cr b/src/server.cr
index 39e3b5a..623b046 100644
--- a/src/server.cr
+++ b/src/server.cr
@@ -2,12 +2,11 @@ require "kemal"
 require "./context"
 require "./auth_handler"
 require "./static_handler"
+require "./log_handler"
 require "./util"
 
 class Server
-	property context : Context
-
-	def initialize(@context)
+	def initialize(@context : Context)
 
 		error 403 do |env|
 			message = "You are not authorized to visit #{env.request.path}"
@@ -87,7 +86,7 @@ class Server
 
 				env.redirect "/admin/user"
 			rescue e
-				puts e.message
+				@context.error e.message
 				redirect_url = URI.new \
 					path: "/admin/user/edit",\
 					query: hash_to_query({"error" => e.message})
@@ -127,7 +126,7 @@ class Server
 
 				env.redirect "/admin/user"
 			rescue e
-				puts e.message
+				@context.error e.message
 				redirect_url = URI.new \
 					path: "/admin/user/edit",\
 					query: hash_to_query({"username" => original_username, \
@@ -234,7 +233,7 @@ class Server
 
 				send_img env, img
 			rescue e
-				STDERR.puts e
+				@context.error e.message
 				env.response.status_code = 500
 				e.message
 			end
@@ -249,7 +248,7 @@ class Server
 
 				send_json env, t.to_json
 			rescue e
-				STDERR.puts e
+				@context.error e.message
 				env.response.status_code = 500
 				e.message
 			end
@@ -303,6 +302,8 @@ class Server
 			end
 		end
 
+		Kemal.config.logging = false
+		add_handler LogHandler.new @context.logger
 		add_handler AuthHandler.new @context.storage
 		{% if flag?(:release) %}
 			# when building for relase, embed the static files in binary
diff --git a/src/static_handler.cr b/src/static_handler.cr
index ae10c44..f35be8b 100644
--- a/src/static_handler.cr
+++ b/src/static_handler.cr
@@ -9,11 +9,7 @@ class FS
 end
 
 class StaticHandler < Kemal::Handler
-	property dirs : Array(String)
-
-	def initialize
-		@dirs = ["/css", "/js"]
-	end
+	@dirs = ["/css", "/js"]
 
 	def call(env)
 		if request_path_startswith env, @dirs
diff --git a/src/storage.cr b/src/storage.cr
index 2b50c32..c42063d 100644
--- a/src/storage.cr
+++ b/src/storage.cr
@@ -16,10 +16,7 @@ def random_str
 end
 
 class Storage
-	property path : String
-
-	def initialize(path)
-		@path = path
+	def initialize(@path : String, @logger : MLogger)
 		dir = File.dirname path
 		unless Dir.exists? dir
 			Dir.mkdir_p dir
@@ -39,7 +36,7 @@ class Storage
 				hash = hash_password random_pw
 				db.exec "insert into users values (?, ?, ?, ?)",
 					"admin", hash, nil, 1
-				puts "Initial user created. You can log in with " \
+				@logger.info "Initial user created. You can log in with " \
 					"#{{"username" => "admin", "password" => random_pw}}"
 			end
 		end