diff --git a/rhodecode/controllers/changeset.py b/rhodecode/controllers/changeset.py
--- a/rhodecode/controllers/changeset.py
+++ b/rhodecode/controllers/changeset.py
@@ -31,11 +31,10 @@ from webob.exc import HTTPForbidden, HTT
 from pylons import tmpl_context as c, url, request, response
 from pylons.i18n.translation import _
 from pylons.controllers.util import redirect
-from pylons.decorators import jsonify
+from rhodecode.lib.utils import jsonify
 
-from rhodecode.lib.vcs.exceptions import RepositoryError, ChangesetError, \
+from rhodecode.lib.vcs.exceptions import RepositoryError, \
     ChangesetDoesNotExistError
-from rhodecode.lib.vcs.nodes import FileNode
 
 import rhodecode.lib.helpers as h
 from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator
@@ -47,8 +46,8 @@ from rhodecode.model.db import Changeset
 from rhodecode.model.comment import ChangesetCommentsModel
 from rhodecode.model.changeset_status import ChangesetStatusModel
 from rhodecode.model.meta import Session
+from rhodecode.model.repo import RepoModel
 from rhodecode.lib.diffs import LimitedDiffContainer
-from rhodecode.model.repo import RepoModel
 from rhodecode.lib.exceptions import StatusChangeOnClosedPullRequestError
 from rhodecode.lib.vcs.backends.base import EmptyChangeset
 from rhodecode.lib.utils2 import safe_unicode
diff --git a/rhodecode/controllers/files.py b/rhodecode/controllers/files.py
--- a/rhodecode/controllers/files.py
+++ b/rhodecode/controllers/files.py
@@ -31,7 +31,7 @@ import tempfile
 from pylons import request, response, tmpl_context as c, url
 from pylons.i18n.translation import _
 from pylons.controllers.util import redirect
-from pylons.decorators import jsonify
+from rhodecode.lib.utils import jsonify
 
 from rhodecode.lib import diffs
 from rhodecode.lib import helpers as h
diff --git a/rhodecode/controllers/pullrequests.py b/rhodecode/controllers/pullrequests.py
--- a/rhodecode/controllers/pullrequests.py
+++ b/rhodecode/controllers/pullrequests.py
@@ -33,7 +33,6 @@ from itertools import groupby
 from pylons import request, response, session, tmpl_context as c, url
 from pylons.controllers.util import abort, redirect
 from pylons.i18n.translation import _
-from pylons.decorators import jsonify
 
 from rhodecode.lib.compat import json
 from rhodecode.lib.base import BaseRepoController, render
@@ -41,7 +40,10 @@ from rhodecode.lib.auth import LoginRequ
     NotAnonymous
 from rhodecode.lib import helpers as h
 from rhodecode.lib import diffs
-from rhodecode.lib.utils import action_logger
+from rhodecode.lib.utils import action_logger, jsonify
+from rhodecode.lib.vcs.exceptions import EmptyRepositoryError
+from rhodecode.lib.vcs.backends.base import EmptyChangeset
+from rhodecode.lib.diffs import LimitedDiffContainer
 from rhodecode.model.db import User, PullRequest, ChangesetStatus,\
     ChangesetComment
 from rhodecode.model.pull_request import PullRequestModel
@@ -50,10 +52,6 @@ from rhodecode.model.repo import RepoMod
 from rhodecode.model.comment import ChangesetCommentsModel
 from rhodecode.model.changeset_status import ChangesetStatusModel
 from rhodecode.model.forms import PullRequestForm
-from rhodecode.lib.vcs.exceptions import EmptyRepositoryError
-from rhodecode.lib.vcs.backends.base import EmptyChangeset
-from rhodecode.lib.diffs import LimitedDiffContainer
-from rhodecode.lib.utils2 import str2bool
 
 log = logging.getLogger(__name__)
 
diff --git a/rhodecode/lib/utils.py b/rhodecode/lib/utils.py
--- a/rhodecode/lib/utils.py
+++ b/rhodecode/lib/utils.py
@@ -32,6 +32,8 @@ import paste
 import beaker
 import tarfile
 import shutil
+import decorator
+import warnings
 from os.path import abspath
 from os.path import dirname as dn, join as jn
 
@@ -714,3 +716,27 @@ def check_git_version():
                         'for the system to function properly. Make sure '
                         'its version is at least %s' % (ver, req_ver))
     return _ver
+
+
+@decorator.decorator
+def jsonify(func, *args, **kwargs):
+    """Action decorator that formats output for JSON
+
+    Given a function that will return content, this decorator will turn
+    the result into JSON, with a content-type of 'application/json' and
+    output it.
+
+    """
+    from pylons.decorators.util import get_pylons
+    from rhodecode.lib.ext_json import json
+    pylons = get_pylons(args)
+    pylons.response.headers['Content-Type'] = 'application/json; charset=utf-8'
+    data = func(*args, **kwargs)
+    if isinstance(data, (list, tuple)):
+        msg = "JSON responses with Array envelopes are susceptible to " \
+              "cross-site data leak attacks, see " \
+              "http://wiki.pylonshq.com/display/pylonsfaq/Warnings"
+        warnings.warn(msg, Warning, 2)
+        log.warning(msg)
+    log.debug("Returning JSON wrapped action output")
+    return json.dumps(data, encoding='utf-8')
\ No newline at end of file