diff --git a/nodejs/express.md b/nodejs/express.md
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@@ -0,0 +1,9 @@
+create self-signed cert
+
+https://docs.nodejitsu.com/articles/HTTP/servers/how-to-create-a-HTTPS-server/
+```
+openssl genrsa -out key.pem
+openssl req -new -key key.pem -out csr.pem
+openssl x509 -req -days 9999 -in csr.pem -signkey key.pem -out cert.pem
+rm csr.pem
+```
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