diff --git a/tool/example.json.is_cloudflare.php b/tool/example.json.is_cloudflare.php
new file mode 100644
index 00000000..104adf60
--- /dev/null
+++ b/tool/example.json.is_cloudflare.php
@@ -0,0 +1,56 @@
+<?php
+/*
+
+	How to use json file
+
+	1. Download .json files: https://codeberg.org/crimeflare/cloudflare-tor/src/branch/master/cloudflare_users/domains
+	2. Edit path: "/path/to/jsonfiles/"
+
+*/
+
+
+/*
+	is_listed_cf(str Domain)
+	return
+		[false, false]: file error
+		[true, true]: is cloudflare
+		[true, false]: not listed
+*/
+function is_listed_cf($domain)
+{
+    if (!in_array(substr($domain, 0, 1), ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'], true)) {
+        return [false, false];
+    }
+    $got = @json_decode(file_get_contents('/path/to/jsonfiles/cloudflare_' . $domain[0] . '.json'), true);
+    if (!is_array($got)) {
+        return [false, false];
+    }
+    return isset($got[$domain]) ? [true, true] : [true, false];
+}
+
+/*
+	is_cloudflare_cached(str Domain)
+	return
+		true: is cloudflare
+		false: not listed
+*/
+function is_cloudflare_cached($f)
+{
+    global $tmpCacheCFlist;
+    if (!isset($tmpCacheCFlist)) {
+        $tmpCacheCFlist = [];
+    }
+	$d = $f;
+    //$d = get_domainname($f)[1];
+    if (isset($tmpCacheCFlist[$d])) {
+        return $tmpCacheCFlist[$d];
+    }
+    $tmpCacheCFlist[$d] = is_listed_cf($d)[1] ? true : false;
+    return $tmpCacheCFlist[$d];
+}
+
+
+// example
+
+var_dump(is_cloudflare_cached('codeberg.org'));// false
+