diff --git a/README.rst b/README.rst
index 40c97ad..f4c5aac 100644
--- a/README.rst
+++ b/README.rst
@@ -26,9 +26,48 @@ Installation
 ::
 
     $ pip install python-envcfg
-    $ pip freeze > requirements.txt  # http://nvie.com/posts/pin-your-packages/
 
 
+Supported Formats
+-----------------
+
+- ``import envcfg.raw.foo as config``:
+  Import each ``FOO_*`` environment variable as string.
+- ``import envcfg.json.foo as config``:
+  Import each ``FOO_*`` environment variable as JSON body.
+- ``import envcfg.smart.foo as config``:
+  Try to import each ``FOO_*`` environment variable as JSON body, if fail then import it as string.
+
+There is an example table:
+
++----------------------+---------------------------+-----------------------+
+| Environment Variable | Python Import Statement   | Python Variable Value |
++======================+===========================+=======================+
+| ``FOO_NAME=foo``     | ``envcfg.raw.foo.NAME``   | ``'foo'``             |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NAME="foo"``   | ``envcfg.raw.foo.NAME``   | ``'"foo"'``           |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NUM1=42``      | ``envcfg.raw.foo.NUM1``   | ``'42'``              |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NUM1="42"``    | ``envcfg.raw.foo.NUM1``   | ``'"42"'``            |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NAME=foo``     | ``envcfg.json.foo.NAME``  | *ImportError*         |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NAME="foo"``   | ``envcfg.json.foo.NAME``  | ``'foo'``             |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NUM1=42``      | ``envcfg.json.foo.NUM1``  | ``42``                |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NUM1="42"``    | ``envcfg.json.foo.NUM1``  | ``'42'``              |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NAME=foo``     | ``envcfg.smart.foo.NAME`` | ``'foo'``             |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NAME="foo"``   | ``envcfg.smart.foo.NAME`` | ``'foo'``             |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NUM1=42``      | ``envcfg.smart.foo.NUM1`` | ``42``                |
++----------------------+---------------------------+-----------------------+
+| ``FOO_NUM1="42"``    | ``envcfg.smart.foo.NUM1`` | ``'42'``              |
++----------------------+---------------------------+-----------------------+
+
 Examples
 --------
 
diff --git a/envcfg/smart/__init__.py b/envcfg/smart/__init__.py
new file mode 100644
index 0000000..5aae86f
--- /dev/null
+++ b/envcfg/smart/__init__.py
@@ -0,0 +1,16 @@
+from __future__ import absolute_import
+
+from .._hook import import_hook
+
+
+@import_hook(__name__)
+def value_processor(name, raw_name, raw_value):
+    import json
+    try:
+        return json.loads(raw_value)
+    except ValueError:
+        return raw_value
+
+
+del import_hook
+del value_processor
diff --git a/tests/test_smart.py b/tests/test_smart.py
new file mode 100644
index 0000000..b715a1d
--- /dev/null
+++ b/tests/test_smart.py
@@ -0,0 +1,37 @@
+from pytest import raises
+
+
+def test_success(environ):
+    environ['SUCHDOGE_BOOLEAN'] = 'true'
+    environ['SUCHDOGE_INTEGER'] = '42'
+    environ['SUCHDOGE_REAL'] = '42.42'
+    environ['SUCHDOGE_STRING'] = '"42"'
+    environ['SUCHDOGE_DICT'] = '{"value": 42}'
+    environ['SUCHDOGE_RAW_STR'] = 'foo'
+
+    from envcfg.smart.suchdoge import (
+        BOOLEAN,
+        INTEGER,
+        REAL,
+        STRING,
+        DICT,
+        RAW_STR,
+    )
+    assert BOOLEAN is True
+    assert INTEGER == 42
+    assert REAL == 42.42
+    assert STRING == '42'
+    assert DICT == {'value': 42}
+    assert RAW_STR == 'foo'
+
+
+def test_failed(environ):
+    with raises(ImportError) as einfo:
+        import envcfg.smart._private_module  # noqa
+    assert einfo.value.args[0].startswith(
+        'No module named envcfg.smart._private_module')
+
+    with raises(ImportError) as einfo:
+        import envcfg.smart.INVALID_NAME  # noqa
+    assert einfo.value.args[0].startswith(
+        'No module named envcfg.smart.INVALID_NAME')
diff --git a/tox.ini b/tox.ini
index ce727ce..89f42a9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py33,py34,pypy
+envlist = py27,py33,py34,py35,pypy
 [testenv]
 deps =
     pytest