diff --git a/README.md b/README.md
index 67d1244..acef161 100644
--- a/README.md
+++ b/README.md
@@ -106,6 +106,25 @@ You can set initial directory:
 
 - Show release note: Help -> Release note
 
+## Inside python code
+
+### View json file
+```
+import pyjsonviewer
+
+pyjsonviewer.view_data(json_file="dat/list.json")
+
+```
+JSON data tree will be shown.
+
+### View json object
+```
+import pyjsonviewer
+json_object = {"a":[1,2,3], "b":"test"}
+pyjsonviewer.view_data(json_data=json_object)
+```
+JSON data tree will be shown.
+
 ## Vimrc setting
 
 If you are a vim user, you can set this command in your vimrc.
diff --git a/pyjsonviewer/__init__.py b/pyjsonviewer/__init__.py
index e69de29..6267dfc 100644
--- a/pyjsonviewer/__init__.py
+++ b/pyjsonviewer/__init__.py
@@ -0,0 +1 @@
+from .pyjsonviewer import view_data
\ No newline at end of file
diff --git a/pyjsonviewer/pyjsonviewer.py b/pyjsonviewer/pyjsonviewer.py
index 1339b65..8fd9ea1 100644
--- a/pyjsonviewer/pyjsonviewer.py
+++ b/pyjsonviewer/pyjsonviewer.py
@@ -55,7 +55,7 @@ def auto_width(self, max_width):
                     break
                 self.config(width=width + w)
 
-    def __init__(self, master, json_path=None, initial_dir="~/"):
+    def __init__(self, master, json_path=None, json_data=None, initial_dir="~/"):
         super().__init__(master)
         self.master = master
         self.tree = ttk.Treeview(self)
@@ -68,7 +68,9 @@ def __init__(self, master, json_path=None, initial_dir="~/"):
         self.search_label = None
 
         if json_path:
-            self.set_table_data_from_json(json_path)
+            self.set_table_data_from_json_path(json_path)
+        elif json_data:
+            self.set_table_data_from_json(json_data)
 
     def create_widgets(self):
         self.tree.bind('<Double-1>', self.click_item)
@@ -127,7 +129,7 @@ def select_json_file(self, event=None):
         file_path = filedialog.askopenfilename(
             initialdir=self.initial_dir,
             filetypes=FILETYPES)
-        self.set_table_data_from_json(file_path)
+        self.set_table_data_from_json_path(file_path)
 
     def expand_all(self, event=None):
         """
@@ -181,7 +183,7 @@ def select_listbox_item(self, event):
         w = event.widget
         index = int(w.curselection()[0])
         value = w.get(index)
-        self.set_table_data_from_json(value)
+        self.set_table_data_from_json_path(value)
         self.sub_win.destroy()  # close window
 
     def select_json_file_from_history(self, event=None):
@@ -214,11 +216,15 @@ def save_json_history(self, file_path):
             for line in lines:
                 f.write(line.replace("\n", "") + "\n")
 
-    def set_table_data_from_json(self, file_path):
+    def set_table_data_from_json(self, json_data):
+        assert type(json_data) in (list, dict)
+        self.delete_all_nodes()
+        self.insert_nodes(json_data)
+
+    def set_table_data_from_json_path(self, file_path):
         data = self.load_json_data(file_path)
         self.save_json_history(file_path)
-        self.delete_all_nodes()
-        self.insert_nodes(data)
+        self.set_table_data_from_json(data)
 
     def delete_all_nodes(self):
         for i in self.tree.get_children():
@@ -277,17 +283,7 @@ def show_info_window():
         messagebox.showinfo("About", msg)
 
 
-def main():
-    print(__file__ + " start!!")
-
-    parser = argparse.ArgumentParser()
-    parser.add_argument('-f', '--file', type=str, help='JSON file path')
-    parser.add_argument('-d', '--dir', type=str,
-                        help='JSON file directory')
-    parser.add_argument('-o', '--open', action='store_true',
-                        default=False, help='Open with finder')
-    args = parser.parse_args()
-
+def view_data(json_file=None, json_data=None, initial_dir=None):
     root: Tk = tk.Tk()
     root.title('PyJSONViewer')
     root.geometry("500x500")
@@ -295,12 +291,12 @@ def main():
                  tk.PhotoImage(file=PROJECT_DIR + '/icon.png'))
     menubar = tk.Menu(root)
 
-    if args.open:
-        args.file = filedialog.askopenfilename(
-            initialdir=args.dir,
-            filetypes=FILETYPES)
-
-    app = JSONTreeFrame(root, json_path=args.file, initial_dir=args.dir)
+    if json_file:
+        app = JSONTreeFrame(root, json_path=json_file, initial_dir=initial_dir)
+    elif json_data:
+        app = JSONTreeFrame(root, json_data=json_data)
+    else:
+        app = JSONTreeFrame(root)
 
     file_menu = tk.Menu(menubar, tearoff=0)
     file_menu.add_command(label="Open", accelerator='Ctrl+O',
@@ -340,5 +336,23 @@ def main():
     root.mainloop()
 
 
+def main():
+    print(__file__ + " start!!")
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-f', '--file', type=str, help='JSON file path')
+    parser.add_argument('-d', '--dir', type=str,
+                        help='JSON file directory')
+    parser.add_argument('-o', '--open', action='store_true',
+                        default=False, help='Open with finder')
+    args = parser.parse_args()
+
+    if args.open:
+        args.file = filedialog.askopenfilename(
+            initialdir=args.dir,
+            filetypes=FILETYPES)
+    view_data(json_file=args.file, initial_dir=args.dir)
+
+
 if __name__ == '__main__':
     main()
diff --git a/setup.py b/setup.py
index 5c0ca4b..b43c893 100644
--- a/setup.py
+++ b/setup.py
@@ -47,6 +47,7 @@
     keywords="python json tkinter",
     packages=find_packages(),
     include_package_data=True,
+    py_modules=["pyjsonviewer"],
     entry_points={
         'console_scripts': ['pyjsonviewer=pyjsonviewer.pyjsonviewer:main']},
     classifiers=[