diff --git a/src/api/host.coffee b/src/api/host.coffee
deleted file mode 100644
index c6db751cf..000000000
--- a/src/api/host.coffee
+++ /dev/null
@@ -1,321 +0,0 @@
-$debug = (require 'debug') 'xo:api:vm'
-$find = require 'lodash/find'
-$findIndex = require 'lodash/findIndex'
-$forEach = require 'lodash/forEach'
-endsWith = require 'lodash/endsWith'
-startsWith = require 'lodash/startsWith'
-{coroutine: $coroutine} = require 'bluebird'
-{format} = require 'json-rpc-peer'
-{
-  extractProperty,
-  mapToArray,
-  parseXml
-} = require '../utils'
-
-#=====================================================================
-
-set = ({
-  host,
-
-  # TODO: use camel case.
-  name_label: nameLabel,
-  name_description: nameDescription
-}) ->
-  return @getXapi(host).setHostProperties(host._xapiId, {
-    nameLabel,
-    nameDescription
-  })
-
-set.description = 'changes the properties of an host'
-
-set.params =
-  id: type: 'string'
-  name_label:
-    type: 'string'
-    optional: true
-  name_description:
-    type: 'string'
-    optional: true
-
-set.resolve = {
-  host: ['id', 'host', 'administrate'],
-}
-
-exports.set = set
-
-#---------------------------------------------------------------------
-
-# FIXME: set force to false per default when correctly implemented in
-# UI.
-restart = ({host, force = true}) ->
-  return @getXapi(host).rebootHost(host._xapiId, force)
-
-restart.description = 'restart the host'
-
-restart.params = {
-  id: { type: 'string' },
-  force: {
-    type: 'boolean',
-    optional: true
-  }
-}
-
-restart.resolve = {
-  host: ['id', 'host', 'operate'],
-}
-
-exports.restart = restart
-
-#---------------------------------------------------------------------
-
-restartAgent = ({host}) ->
-  return @getXapi(host).restartHostAgent(host._xapiId)
-
-restartAgent.description = 'restart the Xen agent on the host'
-
-restartAgent.params = {
-  id: { type: 'string' }
-}
-
-restartAgent.resolve = {
-  host: ['id', 'host', 'administrate'],
-}
-
-# TODO camel case
-exports.restart_agent = restartAgent
-
-#---------------------------------------------------------------------
-
-start = ({host}) ->
-  return @getXapi(host).powerOnHost(host._xapiId)
-
-start.description = 'start the host'
-
-start.params = {
-  id: { type: 'string' }
-}
-
-start.resolve = {
-  host: ['id', 'host', 'operate'],
-}
-
-exports.start = start
-
-#---------------------------------------------------------------------
-
-stop = ({host}) ->
-  return @getXapi(host).shutdownHost(host._xapiId)
-
-stop.description = 'stop the host'
-
-stop.params = {
-  id: { type: 'string' }
-}
-
-stop.resolve = {
-  host: ['id', 'host', 'operate'],
-}
-
-exports.stop = stop
-
-#---------------------------------------------------------------------
-
-detach = ({host}) ->
-  return @getXapi(host).ejectHostFromPool(host._xapiId)
-
-detach.description = 'eject the host of a pool'
-
-detach.params = {
-  id: { type: 'string' }
-}
-
-detach.resolve = {
-  host: ['id', 'host', 'administrate'],
-}
-
-exports.detach = detach
-
-#---------------------------------------------------------------------
-
-enable = ({host}) ->
-  return @getXapi(host).enableHost(host._xapiId)
-
-enable.description = 'enable to create VM on the host'
-
-enable.params = {
-  id: { type: 'string' }
-}
-
-enable.resolve = {
-  host: ['id', 'host', 'administrate'],
-}
-
-exports.enable = enable
-
-#---------------------------------------------------------------------
-
-disable = ({host}) ->
-  return @getXapi(host).disableHost(host._xapiId)
-
-disable.description = 'disable to create VM on the hsot'
-
-disable.params = {
-  id: { type: 'string' }
-}
-
-disable.resolve = {
-  host: ['id', 'host', 'administrate'],
-}
-
-exports.disable = disable
-#---------------------------------------------------------------------
-
-forget = ({host}) ->
-  return @getXapi(host).forgetHost(host._xapiId)
-
-forget.description = 'remove the host record from XAPI database'
-
-forget.params = {
-  id: { type: 'string' }
-}
-
-forget.resolve = {
-  host: ['id', 'host', 'administrate'],
-}
-
-exports.forget = forget
-
-#---------------------------------------------------------------------
-# Returns an array of missing new patches in the host
-# Returns an empty array if up-to-date
-# Throws an error if the host is not running the latest XS version
-
-listMissingPatches = ({host}) ->
-  return @getXapi(host).listMissingPoolPatchesOnHost(host._xapiId)
-
-listMissingPatches.params = {
-  host: { type: 'string' }
-}
-
-listMissingPatches.resolve = {
-  host: ['host', 'host', 'view'],
-}
-
-exports.listMissingPatches = listMissingPatches
-
-listMissingPatches.description = 'return an array of missing new patches in the host'
-
-#---------------------------------------------------------------------
-
-installPatch = ({host, patch: patchUuid}) ->
-  return @getXapi(host).installPoolPatchOnHost(patchUuid, host._xapiId)
-
-installPatch.description = 'install a patch on an host'
-
-installPatch.params = {
-  host: { type: 'string' }
-  patch: { type: 'string' }
-}
-
-installPatch.resolve = {
-  host: ['host', 'host', 'administrate']
-}
-
-exports.installPatch = installPatch
-
-#---------------------------------------------------------------------
-
-installAllPatches = ({host}) ->
-  return @getXapi(host).installAllPoolPatchesOnHost(host._xapiId)
-
-installAllPatches.description = 'install all the missing patches on a host'
-
-installAllPatches.params = {
-  host: { type: 'string' }
-}
-
-installAllPatches.resolve = {
-  host: ['host', 'host', 'administrate']
-}
-
-exports.installAllPatches = installAllPatches
-
-#---------------------------------------------------------------------
-
-emergencyShutdownHost = ({host}) ->
-  return @getXapi(host).emergencyShutdownHost(host._xapiId)
-
-emergencyShutdownHost.description = 'suspend all VMs and shutdown host'
-
-emergencyShutdownHost.params = {
-  host: { type: 'string' }
-}
-
-emergencyShutdownHost.resolve = {
-  host: ['host', 'host', 'administrate']
-}
-
-exports.emergencyShutdownHost = emergencyShutdownHost
-
-#---------------------------------------------------------------------
-
-stats = ({host, granularity}) ->
-  return @getXapiHostStats(host, granularity)
-
-stats.description = 'returns statistic of the host'
-
-stats.params = {
-  host: { type: 'string' },
-  granularity: {
-    type: 'string',
-    optional: true
-  }
-}
-
-stats.resolve = {
-  host: ['host', 'host', 'view']
-}
-
-exports.stats = stats;
-
-#---------------------------------------------------------------------
-
-handleInstallSupplementalPack = $coroutine (req, res, { hostId }) ->
-  xapi = @getXapi(hostId)
-
-  # Timeout seems to be broken in Node 4.
-  # See https://github.com/nodejs/node/issues/3319
-  req.setTimeout(43200000) # 12 hours
-  req.length = req.headers['content-length']
-
-  try
-    yield xapi.installSupplementalPack(req, { hostId })
-    res.end(format.response(0))
-  catch e
-    res.writeHead(500)
-    res.end(format.error(0, new Error(e.message)))
-
-  return
-
-installSupplementalPack = $coroutine ({host}) ->
-  return {
-    $sendTo: yield @registerHttpRequest(handleInstallSupplementalPack, { hostId: host.id })
-  }
-
-installSupplementalPack.description = 'installs supplemental pack from ISO file'
-
-installSupplementalPack.params = {
-  host: { type: 'string' }
-}
-
-installSupplementalPack.resolve = {
-  host: ['host', 'host', 'admin']
-}
-
-exports.installSupplementalPack = installSupplementalPack;
-
-#=====================================================================
-
-Object.defineProperty(exports, '__esModule', {
-  value: true
-})
diff --git a/src/api/host.js b/src/api/host.js
new file mode 100644
index 000000000..08ccef37d
--- /dev/null
+++ b/src/api/host.js
@@ -0,0 +1,295 @@
+
+import {format} from 'json-rpc-peer'
+
+// ===================================================================
+
+export function set ({
+  host,
+
+  // TODO: use camel case.
+  name_label: nameLabel,
+  name_description: nameDescription,
+}) {
+  return this.getXapi(host).setHostProperties(host._xapiId, {
+    nameLabel,
+    nameDescription,
+  })
+}
+
+set.description = 'changes the properties of an host'
+
+set.params = {
+  id: { type: 'string' },
+  name_label: {
+    type: 'string',
+    optional: true,
+  },
+  name_description: {
+    type: 'string',
+    optional: true,
+  },
+}
+
+set.resolve = {
+  host: ['id', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+// FIXME: set force to false per default when correctly implemented in
+// UI.
+export function restart ({ host, force = true }) {
+  return this.getXapi(host).rebootHost(host._xapiId, force)
+}
+
+restart.description = 'restart the host'
+
+restart.params = {
+  id: { type: 'string' },
+  force: {
+    type: 'boolean',
+    optional: true,
+  },
+}
+
+restart.resolve = {
+  host: ['id', 'host', 'operate'],
+}
+
+// -------------------------------------------------------------------
+
+export function restartAgent ({host}) {
+  return this.getXapi(host).restartHostAgent(host._xapiId)
+}
+
+restartAgent.description = 'restart the Xen agent on the host'
+
+restartAgent.params = {
+  id: { type: 'string' },
+}
+
+restartAgent.resolve = {
+  host: ['id', 'host', 'administrate'],
+}
+
+// TODO: remove deprecated alias
+export { restartAgent as restart_agent } // eslint-disable-line camelcase
+
+// -------------------------------------------------------------------
+
+export function start ({host}) {
+  return this.getXapi(host).powerOnHost(host._xapiId)
+}
+
+start.description = 'start the host'
+
+start.params = {
+  id: { type: 'string' },
+}
+
+start.resolve = {
+  host: ['id', 'host', 'operate'],
+}
+
+// -------------------------------------------------------------------
+
+export function stop ({host}) {
+  return this.getXapi(host).shutdownHost(host._xapiId)
+}
+
+stop.description = 'stop the host'
+
+stop.params = {
+  id: { type: 'string' },
+}
+
+stop.resolve = {
+  host: ['id', 'host', 'operate'],
+}
+
+// -------------------------------------------------------------------
+
+export function detach ({host}) {
+  return this.getXapi(host).ejectHostFromPool(host._xapiId)
+}
+
+detach.description = 'eject the host of a pool'
+
+detach.params = {
+  id: { type: 'string' },
+}
+
+detach.resolve = {
+  host: ['id', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+export function enable ({host}) {
+  return this.getXapi(host).enableHost(host._xapiId)
+}
+
+enable.description = 'enable to create VM on the host'
+
+enable.params = {
+  id: { type: 'string' },
+}
+
+enable.resolve = {
+  host: ['id', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+export function disable ({host}) {
+  return this.getXapi(host).disableHost(host._xapiId)
+}
+
+disable.description = 'disable to create VM on the hsot'
+
+disable.params = {
+  id: { type: 'string' },
+}
+
+disable.resolve = {
+  host: ['id', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+export function forget ({host}) {
+  return this.getXapi(host).forgetHost(host._xapiId)
+}
+
+forget.description = 'remove the host record from XAPI database'
+
+forget.params = {
+  id: { type: 'string' },
+}
+
+forget.resolve = {
+  host: ['id', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+// Returns an array of missing new patches in the host
+// Returns an empty array if up-to-date
+// Throws an error if the host is not running the latest XS version
+export function listMissingPatches ({host}) {
+  return this.getXapi(host).listMissingPoolPatchesOnHost(host._xapiId)
+}
+
+listMissingPatches.description = 'return an array of missing new patches in the host'
+
+listMissingPatches.params = {
+  host: { type: 'string' },
+}
+
+listMissingPatches.resolve = {
+  host: ['host', 'host', 'view'],
+}
+
+// -------------------------------------------------------------------
+
+export function installPatch ({host, patch: patchUuid}) {
+  return this.getXapi(host).installPoolPatchOnHost(patchUuid, host._xapiId)
+}
+
+installPatch.description = 'install a patch on an host'
+
+installPatch.params = {
+  host: { type: 'string' },
+  patch: { type: 'string' },
+}
+
+installPatch.resolve = {
+  host: ['host', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+export function installAllPatches ({host}) {
+  return this.getXapi(host).installAllPoolPatchesOnHost(host._xapiId)
+}
+
+installAllPatches.description = 'install all the missing patches on a host'
+
+installAllPatches.params = {
+  host: { type: 'string' },
+}
+
+installAllPatches.resolve = {
+  host: ['host', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+export function emergencyShutdownHost ({host}) {
+  return this.getXapi(host).emergencyShutdownHost(host._xapiId)
+}
+
+emergencyShutdownHost.description = 'suspend all VMs and shutdown host'
+
+emergencyShutdownHost.params = {
+  host: { type: 'string' },
+}
+
+emergencyShutdownHost.resolve = {
+  host: ['host', 'host', 'administrate'],
+}
+
+// -------------------------------------------------------------------
+
+export function stats ({host, granularity}) {
+  return this.getXapiHostStats(host, granularity)
+}
+
+stats.description = 'returns statistic of the host'
+
+stats.params = {
+  host: { type: 'string' },
+  granularity: {
+    type: 'string',
+    optional: true,
+  },
+}
+
+stats.resolve = {
+  host: ['host', 'host', 'view'],
+}
+
+// -------------------------------------------------------------------
+
+async function handleInstallSupplementalPack (req, res, { hostId }) {
+  const xapi = this.getXapi(hostId)
+
+  // Timeout seems to be broken in Node 4.
+  // See https://github.com/nodejs/node/issues/3319
+  req.setTimeout(43200000) // 12 hours
+  req.length = req.headers['content-length']
+
+  try {
+    await xapi.installSupplementalPack(req, { hostId })
+    res.end(format.response(0))
+  } catch (e) {
+    res.writeHead(500)
+    res.end(format.error(0, new Error(e.message)))
+  }
+}
+
+export async function installSupplementalPack ({host}) {
+  return {
+    $sendTo: (await this.registerHttpRequest(handleInstallSupplementalPack, { hostId: host.id })),
+  }
+}
+
+installSupplementalPack.description = 'installs supplemental pack from ISO file'
+
+installSupplementalPack.params = {
+  host: { type: 'string' },
+}
+
+installSupplementalPack.resolve = {
+  host: ['host', 'host', 'admin'],
+}