[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-ep114-multi-device-multi-session-websocket-all--*":3,"academy-blog-faqs-wzoz7l3fkolypwa-en":91,"academy-blog-translations-wzoz7l3fkolypwa":92},{"data":4,"page":77,"perPage":77,"totalItems":77,"totalPages":77},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_l_url":11,"cover_image_m_url":12,"cover_image_path":13,"cover_image_s_url":14,"created":15,"created_by":16,"expand":17,"id":85,"keywords":86,"locale":57,"published_at":87,"scheduled_at":65,"school_blog":81,"short_description":88,"status":79,"title":6,"updated":89,"updated_by":90,"slug":82,"views":84},"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\u002Fl\u002Fcover_image_managing_multi_device_multi_session_in_web_socket_systems_kp81pkol6c.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002Fvtvj7f7xktls88l\u002Fm\u002Fcover_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","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclblg987654321\u002Fvtvj7f7xktls88l\u002Fs\u002Fcover_image_managing_multi_device_multi_session_in_web_socket_systems_kp81pkol6c.webp","2026-03-04 08:45:13.010Z","76qprkevbgfdps8",{"keywords":18,"locale":51,"school_blog":61},[19,26,31,36,41,46],{"collectionId":20,"collectionName":21,"created":22,"created_by":16,"id":23,"name":24,"updated":25,"updated_by":16},"sclkey987654321","school_keywords","2026-03-04 08:45:10.982Z","dqqa1njvmvzgknq","Real-time Application","2026-06-07 06:46:45.244Z",{"collectionId":20,"collectionName":21,"created":27,"created_by":16,"id":28,"name":29,"updated":30,"updated_by":16},"2026-03-04 08:20:11.547Z","ey3puyme01a9bsw","Go","2026-06-07 06:45:07.798Z",{"collectionId":20,"collectionName":21,"created":32,"created_by":16,"id":33,"name":34,"updated":35,"updated_by":16},"2026-03-04 08:45:11.216Z","4pcpc8j9lxwki40","Multi-session","2026-06-07 06:46:45.378Z",{"collectionId":20,"collectionName":21,"created":37,"created_by":16,"id":38,"name":39,"updated":40,"updated_by":16},"2026-03-04 08:45:11.536Z","dam2zlrgu9l1qrd","Multi-device","2026-06-07 06:46:45.580Z",{"collectionId":20,"collectionName":21,"created":42,"created_by":16,"id":43,"name":44,"updated":45,"updated_by":16},"2026-03-04 08:44:48.724Z","s6xhnfomy7n5ycp","WebSocket Server","2026-06-07 06:46:39.070Z",{"collectionId":20,"collectionName":21,"created":47,"created_by":16,"id":48,"name":49,"updated":50,"updated_by":16},"2026-03-04 08:34:00.920Z","ecac9y661or1xka","WebSocket","2026-06-07 06:45:55.734Z",{"code":52,"collectionId":53,"collectionName":54,"created":55,"flag":56,"id":57,"is_default":58,"label":59,"updated":60},"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":62,"collectionId":63,"collectionName":64,"created":65,"expand":66,"id":81,"slug":82,"updated":83,"views":84},"wqxt7ag2gn7xcmk","pbc_2105096300","school_blogs","",{"category":67},{"blogIds":68,"collectionId":69,"collectionName":70,"created":71,"created_by":16,"id":62,"image":72,"image_alt":65,"image_path":73,"image_s_url":74,"label":75,"name":76,"priority":77,"publish_at":78,"scheduled_at":65,"status":79,"updated":80,"updated_by":16},[],"sclcatblg987654321","school_category_blogs","2026-03-04 08:33:53.210Z","59ty92ns80w_15oc1implw_bj2o4tjgh4.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclcatblg987654321\u002Fwqxt7ag2gn7xcmk\u002F59ty92ns80w_15oc1implw_bj2o4tjgh4.webp","https:\u002F\u002Ftwsme-r2.tumwebsme.com\u002Fsclcatblg987654321\u002Fwqxt7ag2gn7xcmk\u002Fs\u002F59ty92ns80w_15oc1implw_bj2o4tjgh4.webp",{"en":76,"th":76},"Golang The Series",1,"2026-03-16 04:39:38.440Z","published","2026-08-18 14:48:36.739Z","wzoz7l3fkolypwa","ep114-multi-device-multi-session-websocket","2026-10-23 04:13:40.601Z",284,"vtvj7f7xktls88l",[23,28,33,38,43,48],"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.","2026-10-14 03:48:07.715Z","ebkf8ra4nd55ual",[],{"th":82,"en":82}]