diff --git a/hugo_gettext/config.py b/hugo_gettext/config.py
index c1ea412..b7cf334 100644
--- a/hugo_gettext/config.py
+++ b/hugo_gettext/config.py
@@ -68,7 +68,8 @@ def _find_string_file(default_lang: str) -> str:
     if not os.path.isdir('i18n'):
         return ''
     possible_paths = [f'i18n/{default_lang}.toml',
-                      f'i18n/{default_lang}.yaml']
+                      f'i18n/{default_lang}.yaml',
+                      f'i18n/{default_lang}.json']
     for path in possible_paths:
         if os.path.isfile(path):
             return path
@@ -76,7 +77,8 @@ def _find_string_file(default_lang: str) -> str:
 
 
 def _find_config_file() -> str:
-    possible_paths = ['hugo.toml', 'hugo.yaml', 'config.toml', 'config.yaml']
+    possible_paths = ['hugo.toml', 'hugo.yaml', 'hugo.json',
+                      'config.toml', 'config.yaml', 'config.json']
     for path in possible_paths:
         if os.path.isfile(path):
             return path
diff --git a/hugo_gettext/utils.py b/hugo_gettext/utils.py
index cb233cc..4566d4d 100644
--- a/hugo_gettext/utils.py
+++ b/hugo_gettext/utils.py
@@ -1,6 +1,7 @@
 # SPDX-FileCopyrightText: 2023 Phu Hung Nguyen <phuhnguyen@outlook.com>
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
+import json
 import os
 import re
 from enum import Enum
@@ -51,6 +52,7 @@ class TextFormat(Enum):
     ELSE = ''
     YAML = '.yaml'
     TOML = '.toml'
+    JSON = '.json'
 
     @classmethod
     def decide_by_path(cls, path: str) -> 'TextFormat':
@@ -58,6 +60,8 @@ def decide_by_path(cls, path: str) -> 'TextFormat':
             return cls.YAML
         elif ext == cls.TOML.value:
             return cls.TOML
+        elif ext == cls.JSON.value:
+            return cls.JSON
         else:
             return cls.ELSE
 
@@ -66,6 +70,8 @@ def load_content(self, content: str):
             return yaml.safe_load(content)
         elif self == TextFormat.TOML:
             return tomlkit.loads(content)
+        elif self == TextFormat.JSON:
+            return json.loads(content)
         else:
             return {}
 
@@ -74,6 +80,8 @@ def dump_obj(self, obj):
             return yaml.dump(obj, default_flow_style=False, allow_unicode=True)
         elif self == TextFormat.TOML:
             return tomlkit.dumps(obj)
+        elif self == TextFormat.JSON:
+            return json.dumps(obj, ensure_ascii=False, indent=4)
         else:
             return ''
 
diff --git a/pyproject.toml b/pyproject.toml
index 349004d..a0b2949 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@
 
 [tool.poetry]
 name = "hugo-gettext"
-version = "0.4.1"
+version = "0.5.0"
 description = "I18n with gettext for Hugo"
 authors = ["Phu Hung Nguyen <phuhnguyen@outlook.com>"]
 license = "LGPL-2.1-or-later"