diff --git a/lib/commands/generate.js b/lib/commands/generate.js
index 92b4635..95943dc 100644
--- a/lib/commands/generate.js
+++ b/lib/commands/generate.js
@@ -3,8 +3,8 @@
 const fs = require('fs')
 const os = require('os')
 const {cwd, exists} = require('../util')
-const chalk = require('chalk')
 const path = require('path')
+const logger = require('../util/logger')
 const ignoreFiles = ['_navbar', '_coverpage', '_sidebar']
 
 // eslint-disable-next-line
@@ -17,17 +17,17 @@ module.exports = function (path = '', sidebar) {
 
       if (!exists(sidebarPath)) {
         genSidebar(cwdPath, sidebarPath)
-        console.log(chalk.green(`Successfully generated the sidebar file '${sidebar}'.`))
+        logger.success(`Successfully generated the sidebar file '${sidebar}'.`)
         return true
       }
 
-      console.error(chalk.red(`The sidebar file '${sidebar}' already exists.`))
+      logger.error(`The sidebar file '${sidebar}' already exists.`)
       process.exitCode = 1
       return false
     }
   }
 
-  console.error(chalk.red(`${cwdPath}`) + ' directory does not exist.')
+  logger.error(`${cwdPath} directory does not exist.`)
 }
 
 function genSidebar(cwdPath, sidebarPath) {
@@ -62,7 +62,7 @@ function genSidebar(cwdPath, sidebarPath) {
   })
   fs.writeFile(sidebarPath, tree, 'utf8', err => {
     if (err) {
-      console.error(chalk.red(`Couldn't generate the sidebar file, error: ${err.message}`))
+      logger.error(`Couldn't generate the sidebar file, error: ${err.message}`)
     }
   })
 }
diff --git a/lib/commands/init.js b/lib/commands/init.js
index fca59c2..6488b2f 100644
--- a/lib/commands/init.js
+++ b/lib/commands/init.js
@@ -3,6 +3,7 @@
 const fs = require('fs')
 const cp = require('cp-file').sync
 const chalk = require('chalk')
+const logger = require('../util/logger')
 const {prompt} = require('enquirer')
 const {cwd, exists, pkg, pwd, read, resolve} = require('../util')
 
@@ -22,7 +23,7 @@ module.exports = function (path = '', local, theme) {
   const cwdPath = cwd(path || '.')
 
   if (exists(cwdPath)) {
-    console.log(chalk.red(`${path || '.'} already exists.`))
+    logger.error(`${path || '.'} already exists.`)
 
     prompt({
       type: 'confirm',
diff --git a/lib/commands/serve.js b/lib/commands/serve.js
index 13de4b8..9b89633 100644
--- a/lib/commands/serve.js
+++ b/lib/commands/serve.js
@@ -6,6 +6,7 @@ const livereload = require('connect-livereload')
 const lrserver = require('livereload')
 const open = require('open')
 const chalk = require('chalk')
+const logger = require('../util/logger')
 const {exists, resolve} = require('../util')
 const getPort = require('get-port')
 
@@ -69,6 +70,6 @@ module.exports = function (
       console.log(msg)
     })
     .catch(err => {
-      console.error(err.message)
+      logger.error(err.message)
     })
 }
diff --git a/lib/commands/start.js b/lib/commands/start.js
index b7205a8..31defe4 100644
--- a/lib/commands/start.js
+++ b/lib/commands/start.js
@@ -5,6 +5,7 @@ const serveStatic = require('serve-static')
 const Renderer = require('docsify-server-renderer')
 const util = require('../util')
 const chalk = require('chalk')
+const logger = require('../util/logger')
 const LRU = require('lru-cache')
 
 const defaultConfig = {
@@ -29,7 +30,7 @@ function loadConfig(config) {
   try {
     return require(util.cwd(config))
   } catch (e) {
-    console.log(chalk.red(`${e.message} in ${config}`))
+    logger.error(`${e.message} in ${config}`)
     process.exit(1)
   }
 }
@@ -78,7 +79,7 @@ module.exports = function (path, configFile, port) {
           res.end(html)
         })
         .catch(function (err) {
-          console.error(err)
+          logger.error(err)
           res.writeHead(404)
           res.end()
         })
diff --git a/lib/util/logger.js b/lib/util/logger.js
new file mode 100644
index 0000000..fcdfb09
--- /dev/null
+++ b/lib/util/logger.js
@@ -0,0 +1,8 @@
+'use strict'
+
+const chalk = require('chalk')
+
+exports.error = msg => console.error(chalk.red(msg))
+
+exports.success = msg => console.log(chalk.green(msg))
+