diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 02c07989..1fc358a5 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -6,3 +6,11 @@
         -
             id: pyflakes
             files: '*.py'
+
+-
+    repo: git@github.com:pre-commit/jshint
+    sha: 191734354d1191e3771c004c3e905a94728d0349
+    hooks:
+        -
+            id: jshint
+            files: '*.js'
\ No newline at end of file
diff --git a/pre_commit/languages/helpers.py b/pre_commit/languages/helpers.py
new file mode 100644
index 00000000..8397e9a8
--- /dev/null
+++ b/pre_commit/languages/helpers.py
@@ -0,0 +1,6 @@
+
+def run_hook(env, hook, file_args):
+    return env.run(
+        ' '.join([hook['entry']] + hook.get('args', []) + list(file_args)),
+        retcode=None,
+    )
\ No newline at end of file
diff --git a/pre_commit/languages/node.py b/pre_commit/languages/node.py
index e2e40da4..bc4fa007 100644
--- a/pre_commit/languages/node.py
+++ b/pre_commit/languages/node.py
@@ -1,7 +1,44 @@
+import contextlib
+from plumbum import local
+
+from pre_commit.languages import helpers
+from pre_commit.languages import python
+
+
+NODE_ENV = 'node_env'
+
+
+class NodeEnv(object):
+    def __init__(self, py_env):
+        self.py_env = py_env
+        self.env_prefix = '. {0}/bin/activate &&'.format(NODE_ENV)
+
+    def run(self, cmd, **kwargs):
+        return self.py_env.run(' '.join([self.env_prefix, cmd]), **kwargs)
+
+
+@contextlib.contextmanager
+def in_env(py_env):
+    yield NodeEnv(py_env)
+
 
 def install_environment():
-    raise NotImplementedError
+    assert local.path('package.json').exists()
+
+    if local.path('node_env').exists():
+        return
+
+    local['virtualenv'][python.PY_ENV]()
+
+    with python.in_env() as python_env:
+        python_env.run('pip install nodeenv')
+        python_env.run('nodeenv {0}'.format(NODE_ENV))
+
+        with in_env(python_env) as node_env:
+            node_env.run('npm install -g')
 
 
 def run_hook(hook, file_args):
-    raise NotImplementedError
\ No newline at end of file
+    with python.in_env() as py_env:
+        with in_env(py_env) as node_env:
+            return helpers.run_hook(node_env, hook, file_args)
\ No newline at end of file
diff --git a/pre_commit/languages/python.py b/pre_commit/languages/python.py
index 08e1c790..850ad660 100644
--- a/pre_commit/languages/python.py
+++ b/pre_commit/languages/python.py
@@ -1,6 +1,7 @@
 
-import contexlib
+import contextlib
 from plumbum import local
+from pre_commit.languages import helpers
 
 PY_ENV = 'py_env'
 
@@ -9,22 +10,11 @@ class PythonEnv(object):
     def __init__(self):
         self.env_prefix = '. {0}/bin/activate &&'.format(PY_ENV)
 
-    def run(self, cmd):
-        return local['bash']['-c', ' '.join([self.env_prefix, cmd])]()
+    def run(self, cmd, **kwargs):
+        return local['bash']['-c', ' '.join([self.env_prefix, cmd])].run(**kwargs)
 
 
-NODE_ENV = 'node_env'
-
-class NodeEnv(object):
-    def __init__(self, py_env):
-        self.py_env = py_env
-        self.env_prefix = '. {0}/bin/activate &&'.format(NODE_ENV)
-
-    def run(self, cmd):
-        return self.py_env.run(' '.join(self.env_prefix, cmd))
-
-
-@contexlib.contextmanager
+@contextlib.contextmanager
 def in_env():
     yield PythonEnv()
 
@@ -44,6 +34,4 @@ def install_environment():
 def run_hook(hook, file_args):
     # TODO: batch filenames
     with in_env() as env:
-        env = env
-        # MAGIC
-        pass
+        return helpers.run_hook(env, hook, file_args)