diff --git a/lib/cmd.js b/lib/cmd.js
index 925f022..186a400 100644
--- a/lib/cmd.js
+++ b/lib/cmd.js
@@ -1,6 +1,7 @@
+const yargonaut = require('yargonaut')
 const yargs = require('yargs')
 const util = require('util')
-const chalk = require('chalk')
+const chalk = yargonaut.chalk()
 const config = require('./config')
 const { __ } = require('./i18n')
 
@@ -75,7 +76,8 @@ exports = module.exports = yargs
   .options({
     'dryrun': {
       description: chalk.cyan.bold(__('set dry run mode')),
-      type: 'boolean'
+      type: 'boolean',
+      alias: 'd',
     }
   })
   .options({
@@ -87,7 +89,8 @@ exports = module.exports = yargs
   .options({
     'nocolor': {
       description: chalk.cyan.bold(__('disable color mode')),
-      type: 'boolean'
+      type: 'boolean',
+      alias: 'n',
     }
   })
   .options({
diff --git a/lib/config.js b/lib/config.js
index dfdb6a1..62eb8e0 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -3,7 +3,8 @@ const fs = require('fs')
 const _ = require('lodash')
 const YAML = require('yamljs')
 const tty = require('tty')
-const chalk = require('chalk')
+const yargonaut = require('yargonaut')
+const chalk = yargonaut.chalk()
 const pkg = require('../package')
 const isWin = /^win/.test(process.platform)
 const userHome = process.env[isWin ? 'USERPROFILE' : 'HOME']
diff --git a/lib/grql.js b/lib/grql.js
index 9e8236f..9f47a0b 100644
--- a/lib/grql.js
+++ b/lib/grql.js
@@ -3,7 +3,8 @@ const util = require('util')
 const { Writable } = require('stream')
 const Promise = require('bluebird')
 const _ = require('lodash')
-const chalk = require('chalk')
+const yargonaut = require('yargonaut')
+const chalk = yargonaut.chalk()
 const Lokka = require('lokka').Lokka
 const { Transport } = require('lokka-transport-http')
 const basicAuthHeader = require('basic-auth-header')
@@ -66,25 +67,9 @@ const grql = (...args) => Promise.resolve()
         Object.assign(env, _.pickBy(_.pick(argv, config.envFields), _.identity))
         const aliasMap = {query: 'queries', 'mutate': 'mutations'}
         const aliasKey = aliasMap[command]
-        const data = (function loadData() {
-          let data = argv._[1] ||
-            config.stdinContent ||
-            (aliasKey && _.get(config.settings, `${aliasKey}.${argv.alias}`))
-          if (aliasKey) {
-            data = (function loadFragment(data) {
-              const fragmentRe = /(\$\{[^\}]+\})/g
-              const fragmentMatch = data.match(fragmentRe) || []
-              return fragmentMatch.reduce((data, fragmentRef) => {
-                const fragmentNameMatch = fragmentRef.match(/\$\{([^\}]+)\}/)
-                const fragmentName = fragmentNameMatch && fragmentNameMatch[1]
-                const fragment = fragmentName &&
-                  client.createFragment(_.get(config.settings, `fragments.${fragmentName}`))
-                return fragment ? data.replace(fragmentRef, fragment) : data
-              }, data)
-            })(data)
-          }
-          return data
-        })()
+        const data = argv._[1] ||
+          config.stdinContent ||
+          (aliasKey && _.get(config.settings, `${aliasKey}.${argv.alias}`))
         if (argv.alias && aliasKey) {
           _.set(config.settings, `${aliasKey}.${argv.alias}`, data)
         }
@@ -97,6 +82,7 @@ const grql = (...args) => Promise.resolve()
         if (argv.verbose) {
           h.print.out(chalk.gray(__('environment details :')))
           h.render(_.omit(env, 'password'), renderOpts)
+          h.print.out(chalk.gray(__('command : ') + chalk.white.bold(command)))
           h.print.out(chalk.gray(__('request headers :')))
           h.render(_.get(transport, '_httpOptions.headers'), renderOpts)
           h.print.out(chalk.gray(__('data :')))
@@ -131,7 +117,7 @@ const grql = (...args) => Promise.resolve()
             h.render(_.get(config.settings, `mutations`), renderOpts)
           }
           if (!argv.save) {
-            throw new Error(__('Error : missing argument'))
+            throw new Error(__('Error : missing argument (try --help)'))
           }
         }
         if (argv.dryrun) {
@@ -163,7 +149,7 @@ const grql = (...args) => Promise.resolve()
                     h.render(result, {yaml: argv.yaml, noColor: argv.nocolor})
                   })
               case 'mutate':
-                return client.query(data, vars)
+                return client.mutate(data, vars)
                   .then(result => {
                     h.render(result, renderOpts)
                   })
diff --git a/lib/helper.js b/lib/helper.js
index f6fb700..fe24fd0 100644
--- a/lib/helper.js
+++ b/lib/helper.js
@@ -1,17 +1,18 @@
 const Promise = require('bluebird')
-const chalk = require('chalk')
+const yargonaut = require('yargonaut')
+const chalk = yargonaut.chalk()
 const util = require('util')
 const prettyjson = require('prettyjson')
 const { __ } = require('./i18n')
 
 const h = {
+  stdout: process.stdout,
+  stderr: process.stderr,
   exit: (exitCode = 0) => {
     process.nextTick(() => {
       process.exit(exitCode)
     })
   },
-  stdout: process.stdout,
-  stderr: process.stderr,
   print: {
     out: (...args) => {
       const msg = util.format(...args)
@@ -48,9 +49,6 @@ const h = {
         process.stdin.destroy()
       })
   },
-  toPrettyJson: (data, noColor) => prettyjson.render(data, {
-    noColor, emptyArrayMsg: __('(empty array)')
-  }),
   render: (data, opt = {}) => {
     const { yaml, noColor } = opt
     if (yaml) {
@@ -60,7 +58,13 @@ const h = {
     } else {
       h.print.out(chalk.bold(JSON.stringify(data, null, 2)))
     }
-  }
+  },
+  toPrettyJson: (data, noColor) => (typeof data === 'undefined' || data === null ?
+      __('null') :
+      prettyjson.render(data, {
+        noColor, emptyArrayMsg: __('(empty array)')
+      })
+  ),
 }
 
 exports = module.exports = h
diff --git a/locales/en.json b/locales/en.json
index 15abf61..e7bbec3 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -1,33 +1,33 @@
 {
-  "for more information, contact": "for more information, contact openhoat@gmail.com",
-  "Usage": "Usage",
   "(empty array)": "(empty array)",
-  "select environment": "select environment",
-  "basic authentication user": "basic authentication user",
+  "Error : missing argument (try --help)": "Error : missing argument (try --help)",
+  "Error: query '%s' not found": "Error: query '%s' not found",
+  "Usage": "Usage",
   "basic authentication password": "basic authentication password",
+  "basic authentication user": "basic authentication user",
+  "command": "command",
+  "create a fragment": "create a fragment",
+  "data": "data",
+  "data :": "data :",
+  "disable color mode": "disable color mode",
+  "empty": "empty",
+  "environment details :": "environment details :",
+  "environments :": "environments :",
+  "for more information, contact": "for more information, contact openhoat@gmail.com",
   "get or set query name": "get or set query name",
-  "persists options to file (%s)": "persists options to file (%s)",
-  "show result in pretty YAML format": "show result in pretty YAML format",
   "graphql server base url": "graphql server base url",
-  "Error: query '%s' not found": "Error: query '%s' not found",
+  "make a graphql query": "make a graphql query",
   "options successfully saved": "options successfully saved",
-  "set verbose mode": "set verbose mode",
+  "persists options to file (%s)": "persists options to file (%s)",
+  "request headers :": "request headers :",
+  "select environment": "select environment",
+  "send graphql mutation": "send graphql mutation",
+  "set a variable used in query (format : key=value)": "set a variable used in query (format : key=value)",
   "set dry run mode": "set dry run mode",
+  "set verbose mode": "set verbose mode",
+  "show result in pretty YAML format": "show result in pretty YAML format",
   "show version": "show version",
-  "environments :": "environments :",
-  "disable color mode": "disable color mode",
-  "Error : missing argument": "Error : missing argument",
-  "set a variable used in query (format : key=value)": "set a variable used in query (format : key=value)",
-  "create a fragment": "create a fragment",
-  "send graphql mutation": "send graphql mutation",
-  "command": "command",
-  "data": "data",
-  "make a graphql query": "make a graphql query",
-  "empty": "empty",
+  "use or set query alias": "use or set query alias",
   "using environment %s": "using environment %s",
-  "environment details :": "environment details :",
-  "request headers :": "request headers :",
-  "data :": "data :",
-  "variables :": "variables :",
-  "use or set query alias": "use or set query alias"
+  "variables :": "variables :"
 }
diff --git a/locales/fr.json b/locales/fr.json
index 0c1e92b..e393624 100644
--- a/locales/fr.json
+++ b/locales/fr.json
@@ -1,33 +1,33 @@
 {
-  "for more information, contact": "pour plus d'information, contacter openhoat@gmail.com",
-  "Usage": "Utilisation",
   "(empty array)": "(liste vide)",
-  "select environment": "sélectionne l'environnement",
-  "basic authentication user": "utilisateur de l'authentification basique",
+  "Error : missing argument (try --help)": "Erreur : argument manquant (essayer --help)",
+  "Error: query '%s' not found": "Erreur : requête '%s' non trouvée",
+  "Usage": "Utilisation",
   "basic authentication password": "mot de passe de l'authentification basique",
+  "basic authentication user": "utilisateur de l'authentification basique",
+  "command": "commande",
+  "create a fragment": "crée un fragment",
+  "data": "données",
+  "data :": "données :",
+  "disable color mode": "désactive le mode couleur",
+  "empty": "vide",
+  "environment details :": "détail de l'environnement :",
+  "environments :": "environnements :",
+  "for more information, contact": "pour plus d'information, contacter openhoat@gmail.com",
   "get or set query name": "nom de la requête à définir ou utiliser",
-  "save options to file (%s)": "savegarde les options dans le fichier (%s)",
-  "show result in pretty YAML format": "montre le résultat au format YAML",
   "graphql server base url": "url de base du serveur graphql",
-  "Error: query '%s' not found": "Erreur : requête '%s' non trouvée",
+  "make a graphql query": "joue une requête graphql",
   "options successfully saved": "options enregistrées avec succès",
-  "set verbose mode": "active le mode verbose",
+  "request headers :": "entêtes de requête :",
+  "save options to file (%s)": "savegarde les options dans le fichier (%s)",
+  "select environment": "sélectionne l'environnement",
+  "send graphql mutation": "envoie une mutation graphql",
+  "set a variable used in query (format : key=value)": "définit une variable à utiliser dans la requête (format : key=value)",
   "set dry run mode": "active le mode dry run",
+  "set verbose mode": "active le mode verbose",
+  "show result in pretty YAML format": "montre le résultat au format YAML",
   "show version": "affiche la version",
-  "environments :": "environnements :",
-  "disable color mode": "désactive le mode couleur",
-  "Error : missing argument": "Erreur : argument manquant",
-  "set a variable used in query (format : key=value)": "définit une variable à utiliser dans la requête (format : key=value)",
-  "create a fragment": "crée un fragment",
-  "send graphql mutation": "envoie une mutation graphql",
-  "command": "commande",
-  "data": "données",
-  "make a graphql query": "joue une requête graphql",
-  "empty": "vide",
+  "use or set query alias": "utilise ou définit un alias de requête",
   "using environment %s": "utilisation de l'environment %s",
-  "environment details :": "détail de l'environnement :",
-  "request headers :": "entêtes de requête :",
-  "data :": "données :",
-  "variables :": "variables :",
-  "use or set query alias": "utilise ou définit un alias de requête"
+  "variables :": "variables :"
 }
diff --git a/package.json b/package.json
index 18cf90e..2aeda3a 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,6 @@
   "dependencies": {
     "basic-auth-header": "^1.0.1",
     "bluebird": "^3.5.0",
-    "chalk": "^1.1.3",
     "fetch-graphql-schema": "^0.2.1",
     "lodash": "^4.17.4",
     "lokka": "^1.7.0",
@@ -47,6 +46,7 @@
     "prettyjson": "^1.2.1",
     "y18n": "^3.2.1",
     "yamljs": "^0.2.10",
+    "yargonaut": "^1.1.2",
     "yargs": "^8.0.1"
   },
   "devDependencies": {
diff --git a/test/grql-test.js b/test/grql-test.js
index 5c4aed9..348e7c7 100644
--- a/test/grql-test.js
+++ b/test/grql-test.js
@@ -36,7 +36,7 @@ describe('grql', function() {
       },
       err => {
         expect(err).to.be.an('error')
-        expect(err).to.have.property('message', grql.__('Error : missing argument'))
+        expect(err).to.have.property('message', grql.__('Error : missing argument (try --help)'))
       }
     )
   )
diff --git a/yarn.lock b/yarn.lock
index fecc24a..5372c34 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -747,6 +747,10 @@ fetch-graphql-schema@^0.2.1:
     mkdirp "^0.5.1"
     node-fetch "^1.6.3"
 
+figlet@^1.1.1:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/figlet/-/figlet-1.2.0.tgz#6c46537378fab649146b5a6143dda019b430b410"
+
 figures@^1.3.5:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/figures/-/figures-1.7.0.tgz#cbe1e3affcf1cd44b80cadfed28dc793a9701d2e"
@@ -979,14 +983,10 @@ http-signature@~1.1.0:
     jsprim "^1.2.2"
     sshpk "^1.7.0"
 
-iconv-lite@0.4.15:
+iconv-lite@0.4.15, iconv-lite@~0.4.13:
   version "0.4.15"
   resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.15.tgz#fe265a218ac6a57cfe854927e9d04c19825eddeb"
 
-iconv-lite@~0.4.13:
-  version "0.4.17"
-  resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.17.tgz#4fdaa3b38acbc2c031b045d0edcdfe1ecab18c8d"
-
 ignore@^3.2.0:
   version "3.3.3"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-3.3.3.tgz#432352e57accd87ab3110e82d3fea0e47812156d"
@@ -1582,6 +1582,10 @@ p-locate@^2.0.0:
   dependencies:
     p-limit "^1.1.0"
 
+parent-require@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/parent-require/-/parent-require-1.0.0.tgz#746a167638083a860b0eef6732cb27ed46c32977"
+
 parse-json@^2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-2.2.0.tgz#f480f40434ef80741f8469099f8dea18f55a4dc9"
@@ -2254,6 +2258,14 @@ yamljs@^0.2.10:
     argparse "^1.0.7"
     glob "^7.0.5"
 
+yargonaut@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/yargonaut/-/yargonaut-1.1.2.tgz#ee7b89e98121a3f241fa926a2a6e1b6641c81b3f"
+  dependencies:
+    chalk "^1.1.1"
+    figlet "^1.1.1"
+    parent-require "^1.0.0"
+
 yargs-parser@^7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-7.0.0.tgz#8d0ac42f16ea55debd332caf4c4038b3e3f5dfd9"