diff --git a/src/xswang.com/catalog.py b/src/xswang.com/catalog.py
new file mode 100644
index 0000000..2e40854
--- /dev/null
+++ b/src/xswang.com/catalog.py
@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Fetch catalog and output as JSON format.
+
+    USAGE: python3 catalog.py
+"""
+
+import re
+import json
+import requests
+from bs4 import BeautifulSoup
+
+userAgent = (  # default user agent
+    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) '
+    'AppleWebKit/537.36 (KHTML, like Gecko) '
+    'Chrome/106.0.0.0 Safari/537.36 Edg/106.0.1370.47'
+)
+
+
+def httpRequest(url: str) -> str:  # fetch raw html content
+    request = requests.get(url, headers = {
+        'user-agent': userAgent,  # with fake user-agent
+        'accept-encoding': 'gzip, deflate',  # allow content compress
+    })
+    if request.status_code not in range(200, 300):  # http status code 2xx
+        raise RuntimeError('Http request failed')
+    return request.text
+
+
+def extractCatalog(rawHtml: str) -> dict:  # extract catalog from html content
+    catalog = {}
+    html = BeautifulSoup(rawHtml, 'lxml')
+    for item in [x.select('a')[0] for x in html.select('dd')]:
+        pageId = item.attrs['href'].replace('/book/56718/', '').replace('.html', '')
+        catalog[item.text.strip()] = pageId
+    catalog = sorted(catalog.items(), key = lambda d: int(
+        re.search(r'^第(\d+)章', d[0])[1]  # sort by chapter
+    ))
+    return {x[0]: x[1] for x in catalog}  # formatted output
+
+
+print(json.dumps(
+    extractCatalog(httpRequest('https://www.xswang.com/book/56718/'))
+))