diff --git a/src/wap.ixsw.la/catalog.py b/src/wap.ixsw.la/catalog.py
new file mode 100644
index 0000000..419ec94
--- /dev/null
+++ b/src/wap.ixsw.la/catalog.py
@@ -0,0 +1,45 @@
+#!/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 str(request.content, encoding = 'utf-8')
+
+
+def extractCatalog(rawHtml: str) -> dict:  # extract catalog from html content
+    catalog = {}
+    html = BeautifulSoup(rawHtml, 'lxml')
+    div = html.select('div[class="directoryArea"]')[0]
+    for item in div.select('a[style=""]'):
+        name = re.search(r'^(第\d+章)(.*)$', item.text)
+        pageId = item.attrs['href'].replace('/ks82668/', '').replace('.html', '')
+        catalog['%s %s' % (name[1], name[2].strip())] = pageId
+    return catalog
+
+
+print(json.dumps(
+    extractCatalog(httpRequest('https://wap.ixsw.la/ks82668/all.html'))
+))