[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-ep114-managing-multi-device-multi-session-websocket-all--*":3,"academy-blog-translations-gfvirj7858src70":84},{"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":79,"keywords":80,"locale":54,"published_at":81,"scheduled_at":13,"school_blog":76,"short_description":82,"status":74,"title":6,"updated":83,"updated_by":13,"slug":77,"views":78},"EP.114 Managing Multi-device & Multi-session in WebSocket Systems","sclblg987654321","school_blog_translations","\u003Cp>In real-world real-time applications such as chat systems, notifications, or online games, a single user might log in from multiple devices simultaneously, like a mobile phone and a desktop 💻📱\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Cp>If your WebSocket system doesn't handle multi-device or multi-session properly, you may face issues like delayed synchronization, duplicate messages, or session leaks.\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Cp>In this episode, you'll learn how to build a WebSocket system that:\u003C\u002Fp>\u003Cul>\u003Cli>Supports multiple active devices per user\u003C\u002Fli>\u003Cli>Manages independent sessions securely\u003C\u002Fli>\u003Cli>Syncs data across devices in real time\u003C\u002Fli>\u003Cli>Is production-ready for real-world scale 🚀\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2>🔍 Common Problems with Multiple Sessions\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cfigure class=\"table\">\u003Ctable>\u003Cthead>\u003Ctr>\u003Cth>Problem\u003C\u002Fth>\u003Cth>Description\u003C\u002Fth>\u003C\u002Ftr>\u003C\u002Fthead>\u003Ctbody>\u003Ctr>\u003Ctd>Duplicate Sessions\u003C\u002Ftd>\u003Ctd>The same user opens multiple devices → duplicate messages appear\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Connection Leak\u003C\u002Ftd>\u003Ctd>Previous sessions not closed when a new device connects\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Expired Token\u003C\u002Ftd>\u003Ctd>Poor refresh token handling causes disconnection\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Slow Sync\u003C\u002Ftd>\u003Ctd>Delayed data updates across devices\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003C\u002Ffigure>\u003Cp> \u003C\u002Fp>\u003Cp>✅ A solid system should give each device its own session, but ensure synchronized data across all.\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2>🧩 WebSocket Session Structure\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-go\">type Session struct {\n\tUserID     string\n\tDeviceID   string\n\tConnection *websocket.Conn\n}\n\nvar (\n\tactiveSessions = make(map[string]map[string]*Session) \u002F\u002F userID → deviceID → session\n\tmu             sync.Mutex\n)\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Cp>✅ One user can have multiple devices\u003Cbr>✅ Each device has its own session\u003Cbr>✅ You can send messages to specific devices or broadcast to all\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2>🔌 Handling Connections from Multiple Devices\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-go\">func handleConnection(w http.ResponseWriter, r *http.Request) {\n\tconn, _ := upgrader.Upgrade(w, r, nil)\n\tuserID := r.URL.Query().Get(\"user_id\")\n\tdeviceID := r.URL.Query().Get(\"device_id\")\n\n\tmu.Lock()\n\tif activeSessions[userID] == nil {\n\t\tactiveSessions[userID] = make(map[string]*Session)\n\t}\n\tactiveSessions[userID][deviceID] = &Session{\n\t\tUserID:     userID,\n\t\tDeviceID:   deviceID,\n\t\tConnection: conn,\n\t}\n\tmu.Unlock()\n\n\tdefer func() {\n\t\tmu.Lock()\n\t\tdelete(activeSessions[userID], deviceID)\n\t\tif len(activeSessions[userID]) == 0 {\n\t\t\tdelete(activeSessions, userID)\n\t\t}\n\t\tmu.Unlock()\n\t\tconn.Close()\n\t}()\n\n\tfor {\n\t\t_, msg, err := conn.ReadMessage()\n\t\tif err != nil {\n\t\t\tbreak\n\t\t}\n\t\tlog.Printf(\"[%s-%s]: %s\", userID, deviceID, msg)\n\t}\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Cp>✅ When a device disconnects, its session is removed\u003Cbr>✅ No stale sessions remain in the system\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2>🔐 Token & Session Validation\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-go\">func validateToken(token string) (string, error) {\n\tclaims := &jwt.StandardClaims{}\n\t_, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {\n\t\treturn []byte(\"SECRET_KEY\"), nil\n\t})\n\tif err != nil {\n\t\treturn \"\", err\n\t}\n\treturn claims.Subject, nil\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Cul>\u003Cli>Each device should have its own access token\u003C\u002Fli>\u003Cli>Refresh tokens should be handled per device\u003C\u002Fli>\u003Cli>If a token expires → disconnect only that session\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2>🌐 Real-time Sync Across Devices\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext language-go\">func syncToAllDevices(userID string, message string) {\n\tmu.Lock()\n\tdefer mu.Unlock()\n\tfor _, session := range activeSessions[userID] {\n\t\tsession.Connection.WriteMessage(websocket.TextMessage, []byte(message))\n\t}\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Cp>✅ Send a message from mobile → it appears on desktop instantly\u003Cbr>✅ Achieve real-time sync across all devices\u003Cbr>✅ Fully ready for production-scale applications\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2>🧱 Production-level Recommendations\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cfigure class=\"table\">\u003Ctable>\u003Cthead>\u003Ctr>\u003Cth>Category\u003C\u002Fth>\u003Cth>Recommendation\u003C\u002Fth>\u003C\u002Ftr>\u003C\u002Fthead>\u003Ctbody>\u003Ctr>\u003Ctd>Session Storage\u003C\u002Ftd>\u003Ctd>Use Redis or a database to persist session state\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Security\u003C\u002Ftd>\u003Ctd>Bind tokens to specific device IDs\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Sync\u003C\u002Ftd>\u003Ctd>Use Redis Pub\u002FSub to distribute updates\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Timeout\u003C\u002Ftd>\u003Ctd>Automatically remove sessions after idle timeout\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Monitoring\u003C\u002Ftd>\u003Ctd>Track the number of connected devices per user\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003C\u002Ffigure>\u003Cp> \u003C\u002Fp>\u003Ch2>🚀 Ready for a Challenge?\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp>Try building a system where: One user logs in from both mobile and desktop → Sends a message from one device → Instantly appears on the other\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Cp>If you pull this off, you're building like the pros do in real production environments ✅\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Chr>\u003Cp> \u003C\u002Fp>\u003Ch2>🌟 Coming Next: Advanced Multiplayer Game Systems (EP.115)\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp>In EP.115, we’ll enter the world of real-time multiplayer games.\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Cp>Learn how to sync player state, events, and positions across all users using Go and WebSocket so you're ready to build next-gen interactive gaming platforms 🎮\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Cdiv class=\"raw-html-embed\">\u003Cdiv style=\"margin:0 0 6px 0; font-weight:700;\">Read more:\u003C\u002Fdiv>\n\u003Cul style=\"list-style:none; padding:0; margin:0; line-height:1.4;\">\n  \u003Cli style=\"margin:0;\">\u003Ca href=\"\u002Fen\u002Fblogs\u002Fcategories\u002FGolang\" 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\u003C\u002Ful>\n\u003C\u002Fdiv>\u003Cp> \u003C\u002Fp>","cover_image_managing_multi_device_multi_session_in_web_socket_systems_kp81pkol6c.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002Fvtvj7f7xktls88l\u002Fcover_image_managing_multi_device_multi_session_in_web_socket_systems_kp81pkol6c.webp","2026-03-04 08:45:13.010Z","",{"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 08:45:10.982Z","dqqa1njvmvzgknq","Real-time Application","2026-04-10 16:12:55.322Z",{"collectionId":17,"collectionName":18,"created":24,"created_by":13,"id":25,"name":26,"updated":27,"updated_by":13},"2026-03-04 08:20:11.547Z","ey3puyme01a9bsw","Go","2026-04-10 16:07:25.893Z",{"collectionId":17,"collectionName":18,"created":29,"created_by":13,"id":30,"name":31,"updated":32,"updated_by":13},"2026-03-04 08:45:11.216Z","4pcpc8j9lxwki40","Multi-session","2026-04-10 16:12:55.409Z",{"collectionId":17,"collectionName":18,"created":34,"created_by":13,"id":35,"name":36,"updated":37,"updated_by":13},"2026-03-04 08:45:11.536Z","dam2zlrgu9l1qrd","Multi-device","2026-04-10 16:12:55.519Z",{"collectionId":17,"collectionName":18,"created":39,"created_by":13,"id":40,"name":41,"updated":42,"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":44,"created_by":13,"id":45,"name":46,"updated":47,"updated_by":13},"2026-03-04 08:34:00.920Z","ecac9y661or1xka","WebSocket","2026-04-10 16:08:05.227Z",{"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":13,"views":78},"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","gfvirj7858src70","ep114-managing-multi-device-multi-session-websocket",215,"vtvj7f7xktls88l",[20,25,30,35,40,45],"2025-12-08 02:14:19.907Z","Learn how to design a WebSocket system that supports multiple devices per user with stable sessions, real-time synchronization, secure token management, and production-ready patterns complete with Go code examples.","2026-05-08 06:52:05.993Z",{"th":77,"en":77}]