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Node.js/Standard Packages/dgram.md

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+# UDP Module
+
+```js
+const socket = dgram.createSocket("udp4");  // connect to network interface
+
+socket.on("error", (err) => { /* handle error */ });
+socket.on("message", (msg, rinfo) => {});
+socket.on("end", () => {});
+
+socket.bind(port);  // listen to port
+socket.on('listening', () => {});
+
+socket.send(message, port, host, (err) => { /* handle error */ });
+```
+
+## Multicasting
+
+```js
+const socket = dgram.createSocket({ type: "udp4", reuseAddr: true });
+// When reuseAddr is true socket.bind() will reuse the address, even if another process has already bound a socket on it. 
+
+const multicastPort = 5555;
+const multicastAddress = "239.255.255.255";  // whatever ip
+
+socket.bind(multicastPort);
+
+socket.on("listening", () => {
+    socket.addMembership(multicastAddress);
+})
+
+socket.on("message", (msg, rinfo) => {
+    console.log(`Got: "${msg.toString()}" from ${rinfo.address}`);
+});
+```