[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-websocket-broadcast-messaging-all--*":3,"academy-blog-translations-qfbq7s08nzkoydb":85},{"data":4,"page":72,"perPage":72,"totalItems":72,"totalPages":72},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_path":11,"created":12,"created_by":13,"expand":14,"id":80,"keywords":81,"locale":54,"published_at":82,"scheduled_at":13,"school_blog":76,"short_description":83,"status":74,"title":6,"updated":84,"updated_by":13,"slug":77,"views":79},"EP.71 Using WebSocket for Broadcast Messaging System Development","sclblg987654321","school_blog_translations","\u003Cp data-start=\"439\" data-end=\"820\">In EP.71, we will talk about using WebSocket to create a Broadcast Messaging system that allows a message to be sent from the WebSocket Server to multiple clients simultaneously in real-time. This feature is essential for applications like WebSocket Chat, where you need to broadcast important messages, announcements, or updates to all connected users.\u003C\u002Fp>\u003Cp data-start=\"822\" data-end=\"1132\">Using a Broadcast Messaging system helps reduce the complexity and workload by enabling the server to send a single message to multiple clients without making individual connections. This feature helps to streamline communication within chat rooms, particularly in real-time communication environments.\u003C\u002Fp>\u003Cp data-start=\"822\" data-end=\"1132\"> \u003C\u002Fp>\u003Ch2>Why Use Broadcast Messaging in WebSocket Chat?\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"4301\" data-end=\"4431\">Broadcast messaging allows a single message to be delivered to all connected users in real-time, which brings multiple advantages:\u003C\u002Fp>\u003Cul data-start=\"4433\" data-end=\"4690\">\u003Cli data-start=\"4433\" data-end=\"4500\">\u003Cp data-start=\"4435\" data-end=\"4500\">Resource-efficient: No need to loop through users one by one.\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4501\" data-end=\"4597\">\u003Cp data-start=\"4503\" data-end=\"4597\">Fast communication: WebSocket provides real-time, persistent bi-directional communication.\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4598\" data-end=\"4690\">\u003Cp data-start=\"4600\" data-end=\"4690\">Easy management: Admins can broadcast announcements instantly to everyone in the room.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2>How the Broadcast System Works\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"4734\" data-end=\"4904\">The server acts as a hub to relay messages from one client to all others connected via WebSocket. Persistent connections eliminate the overhead of repeated HTTP requests.\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2>Go Code Example – Building a Broadcast Server\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">package main\n\nimport (\n    \"log\"\n    \"net\u002Fhttp\"\n    \"sync\"\n\n    \"github.com\u002Fgorilla\u002Fwebsocket\"\n)\n\nvar (\n    clients   = make(map[*websocket.Conn]bool)\n    clientsMu sync.Mutex\n    broadcast = make(chan Message)\n)\n\ntype Message struct {\n    User    string `json:\"user\"`\n    Message string `json:\"message\"`\n}\n\nvar upgrader = websocket.Upgrader{\n    CheckOrigin: func(r *http.Request) bool { return true },\n}\n\nfunc handleConnections(w http.ResponseWriter, r *http.Request) {\n    conn, err := upgrader.Upgrade(w, r, nil)\n    if err != nil {\n        log.Println(\"Upgrade error:\", err)\n        return\n    }\n    defer conn.Close()\n\n    clientsMu.Lock()\n    clients[conn] = true\n    clientsMu.Unlock()\n\n    for {\n        var msg Message\n        if err := conn.ReadJSON(&msg); err != nil {\n            log.Println(\"Read error:\", err)\n            clientsMu.Lock()\n            delete(clients, conn)\n            clientsMu.Unlock()\n            break\n        }\n        broadcast <- msg\n    }\n}\n\nfunc handleMessages() {\n    for msg := range broadcast {\n        clientsMu.Lock()\n        for client := range clients {\n            if err := client.WriteJSON(msg); err != nil {\n                log.Println(\"Write error:\", err)\n                client.Close()\n                delete(clients, client)\n            }\n        }\n        clientsMu.Unlock()\n    }\n}\n\nfunc main() {\n    http.HandleFunc(\"\u002Fws\", handleConnections)\n    go handleMessages()\n\n    log.Println(\"Server started on :8080\")\n    log.Fatal(http.ListenAndServe(\":8080\", nil))\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Ch2>Code Explanation:\u003C\u002Fh2>\u003Cul data-start=\"5037\" data-end=\"5343\">\u003Cli data-start=\"5037\" data-end=\"5091\">\u003Cp data-start=\"5039\" data-end=\"5091\">\u003Ccode data-start=\"5039\" data-end=\"5048\">clients\u003C\u002Fcode>: a map of all active WebSocket connections\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"5092\" data-end=\"5147\">\u003Cp data-start=\"5094\" data-end=\"5147\">\u003Ccode data-start=\"5094\" data-end=\"5105\">clientsMu\u003C\u002Fcode>: a mutex to prevent concurrent map writes\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"5148\" data-end=\"5210\">\u003Cp data-start=\"5150\" data-end=\"5210\">\u003Ccode data-start=\"5150\" data-end=\"5161\">broadcast\u003C\u002Fcode>: a channel that delivers messages to all clients\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"5211\" data-end=\"5283\">\u003Cp data-start=\"5213\" data-end=\"5283\">\u003Ccode data-start=\"5213\" data-end=\"5232\">handleConnections\u003C\u002Fcode>: listens for new connections and incoming messages\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"5284\" data-end=\"5343\">\u003Cp data-start=\"5286\" data-end=\"5343\">\u003Ccode data-start=\"5286\" data-end=\"5302\">handleMessages\u003C\u002Fcode>: sends messages to all connected clients\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2>Try It Yourself!\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"5373\" data-end=\"5485\">Connect multiple WebSocket clients and send a message from one — watch how it broadcasts to all connected users.\u003C\u002Fp>\u003Cp data-start=\"5373\" data-end=\"5485\"> \u003C\u002Fp>\u003Chr>\u003Cp> \u003C\u002Fp>\u003Ch3>Bonus Challenge\u003C\u002Fh3>\u003Cp data-start=\"5514\" data-end=\"5619\">Implement an admin announcement feature that highlights admin messages differently from regular messages.\u003C\u002Fp>\u003Cp data-start=\"5514\" data-end=\"5619\"> \u003C\u002Fp>\u003Carticle class=\"text-token-text-primary w-full focus:outline-none scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" tabindex=\"-1\" dir=\"auto\" data-testid=\"conversation-turn-248\" data-scroll-anchor=\"true\" data-turn=\"assistant\">\u003Cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\">\u003Cdiv class=\"[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\u002Fturn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\">\u003Cdiv class=\"flex max-w-full flex-col grow\">\u003Cdiv class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&]:mt-5\" data-message-author-role=\"assistant\" data-message-id=\"52402fad-8c19-477f-944b-7cafc76be385\" dir=\"auto\" data-message-model-slug=\"gpt-4o-mini\">\u003Cdiv class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[3px]\">\u003Cdiv class=\"markdown prose dark:prose-invert w-full break-words light markdown-new-styling\">\u003Ch3>Next EP:\u003C\u002Fh3>\u003Cp data-start=\"5924\" data-end=\"6093\" data-is-last-node=\"\" data-is-only-node=\"\">In EP.72, we will explore Building a Message Logging System in WebSocket to store and retrieve chat histories efficiently for WebSocket Chat applications!\u003C\u002Fp>\u003Cp data-start=\"5924\" data-end=\"6093\" data-is-last-node=\"\" data-is-only-node=\"\"> \u003C\u002Fp>\u003Cp data-start=\"498\" data-end=\"834\">\u003Cstrong>Read more\u003C\u002Fstrong>\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp data-start=\"498\" data-end=\"834\">\u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdev.school\u002Fblogs\u002Fcategories\u002FGolang\">\u003Cstrong>Golang The Series\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp data-start=\"498\" data-end=\"834\">\u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdev.school\u002Fblogs\u002Fcategories\u002FJS2GO\">\u003Cstrong>JS2GO\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp data-start=\"498\" data-end=\"834\">\u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdev.school\u002Fen\u002Fblogs\u002Fcategories\u002FTailwind%20CSS\">\u003Cstrong>10 Eps That Will Make You a Pro Tailwind CSS Overnight\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>\u003Cstrong>🔵 Facebook: \u003C\u002Fstrong>\u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.facebook.com\u002Fsuperdev.school.th\">\u003Cstrong>Superdev School  (Superdev)\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003Cp>\u003Cstrong>📸 Instagram: \u003C\u002Fstrong>\u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.instagram.com\u002Fsuperdevschool\u002F\">\u003Cstrong>superdevschool\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003Cp>\u003Cstrong>🎬 TikTok: \u003C\u002Fstrong>\u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.tiktok.com\u002F@superdevschool\">\u003Cstrong>superdevschool\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003Cp class=\"\" data-start=\"5978\" data-end=\"6095\">\u003Cstrong>🌐 Website: \u003C\u002Fstrong>\u003Ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\u002F\u002Fwww.superdev.school\u002F\">\u003Cstrong>www.superdev.school\u003C\u002Fstrong>\u003C\u002Fa>\u003C\u002Fp>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Farticle>","114_11zon_aoxe4qepgq.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002Fqu8xs0pubaooskn\u002F114_11zon_aoxe4qepgq.webp","2026-03-04 08:47:29.461Z","",{"keywords":15,"locale":48,"school_blog":58},[16,23,28,33,38,43],{"collectionId":17,"collectionName":18,"created":19,"created_by":13,"id":20,"name":21,"updated":22,"updated_by":13},"sclkey987654321","school_keywords","2026-03-04 08:47:27.531Z","8i5bikzi4dzlpgq","WebSocket real-time communication","2026-04-10 16:13:28.896Z",{"collectionId":17,"collectionName":18,"created":24,"created_by":13,"id":25,"name":26,"updated":27,"updated_by":13},"2026-03-04 08:44:48.724Z","s6xhnfomy7n5ycp","WebSocket Server","2026-04-10 16:12:50.171Z",{"collectionId":17,"collectionName":18,"created":29,"created_by":13,"id":30,"name":31,"updated":32,"updated_by":13},"2026-03-04 08:47:27.915Z","chadgopbc2ilima","Broadcast messaging","2026-04-10 16:13:28.991Z",{"collectionId":17,"collectionName":18,"created":34,"created_by":13,"id":35,"name":36,"updated":37,"updated_by":13},"2026-03-04 08:47:28.147Z","ji5s4pvj94smgzj","WebSocket broadcast","2026-04-10 16:13:29.079Z",{"collectionId":17,"collectionName":18,"created":39,"created_by":13,"id":40,"name":41,"updated":42,"updated_by":13},"2026-03-04 08:20:11.547Z","ey3puyme01a9bsw","Go","2026-04-10 16:07:25.893Z",{"collectionId":17,"collectionName":18,"created":44,"created_by":13,"id":45,"name":46,"updated":47,"updated_by":13},"2026-03-04 08:46:14.782Z","v0mhensk18fofru","WebSocket Chat","2026-04-10 16:13:10.563Z",{"code":49,"collectionId":50,"collectionName":51,"created":52,"flag":53,"id":54,"is_default":55,"label":56,"updated":57},"en","pbc_1989393366","locales","2026-01-22 11:00:02.726Z","twemoji:flag-united-states","qv9c1llfov2d88z",false,"English","2026-04-10 15:42:46.825Z",{"category":59,"collectionId":60,"collectionName":61,"created":13,"expand":62,"id":76,"slug":77,"updated":78,"views":79},"wqxt7ag2gn7xcmk","pbc_2105096300","school_blogs",{"category":63},{"blogIds":64,"collectionId":65,"collectionName":66,"created":67,"created_by":13,"id":59,"image":68,"image_alt":13,"image_path":69,"label":70,"name":71,"priority":72,"publish_at":73,"scheduled_at":13,"status":74,"updated":75,"updated_by":13},[],"sclcatblg987654321","school_category_blogs","2026-03-04 08:33:53.210Z","59ty92ns80w_15oc1implw.png","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclcatblg987654321\u002Fwqxt7ag2gn7xcmk\u002F59ty92ns80w_15oc1implw.png",{"en":71,"th":71},"Golang The Series",1,"2026-03-16 04:39:38.440Z","published","2026-04-25 02:32:15.470Z","qfbq7s08nzkoydb","websocket-broadcast-messaging","2026-05-12 04:53:24.477Z",238,"qu8xs0pubaooskn",[20,25,30,35,40,45],"2025-08-04 03:59:17.917Z","Learn how to use WebSocket to develop a Broadcast Messaging system that allows you to send messages to multiple clients at the same time in real-time.","2026-05-06 08:38:17.762Z",{"th":77,"en":77}]