[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-ep-120-whiteboard-realtime-drawing-websocket-all--*":3,"academy-blog-translations-1h3hjyb5awyprlq":78},{"data":4,"page":66,"perPage":66,"totalItems":66,"totalPages":66},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_path":11,"created":12,"created_by":13,"expand":14,"id":73,"keywords":74,"locale":49,"published_at":75,"scheduled_at":13,"school_blog":70,"short_description":76,"status":68,"title":6,"updated":77,"updated_by":13,"slug":71,"views":72},"EP.120 Whiteboard & Real-time Drawing Synchronization with WebSocket","sclblg987654321","school_blog_translations","\u003Cp data-start=\"237\" data-end=\"382\">After building a collaborative document editor using text sync, it’s time to move toward something even more challenging real-time drawing.\u003C\u002Fp>\u003Cp data-start=\"237\" data-end=\"382\"> \u003C\u002Fp>\u003Cp data-start=\"384\" data-end=\"484\">Apps like Miro, FigJam, and Excalidraw must support highly interactive features such as:\u003C\u002Fp>\u003Cul data-start=\"486\" data-end=\"681\">\u003Cli data-start=\"486\" data-end=\"529\">\u003Cp data-start=\"488\" data-end=\"529\">Multiple users drawing at the same time\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"530\" data-end=\"578\">\u003Cp data-start=\"532\" data-end=\"578\">Real-time shape, stroke, and cursor movement\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"579\" data-end=\"631\">\u003Cp data-start=\"581\" data-end=\"631\">Shared canvas state that stays perfectly in sync\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"632\" data-end=\"657\">\u003Cp data-start=\"634\" data-end=\"657\">Instant Undo\u002FRedo\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"658\" data-end=\"681\">\u003Cp data-start=\"660\" data-end=\"681\">Ultra-low latency\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp data-start=\"660\" data-end=\"681\"> \u003C\u002Fp>\u003Cp data-start=\"683\" data-end=\"845\">In this article, you'll learn how to build a real-time Whiteboard System using Go + WebSocket, with architecture and code that’s ready for production use.\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"852\" data-end=\"886\">🧠 System Architecture Overview\u003C\u002Fh2>\u003Cdiv class=\"contain-inline-size rounded-2xl corner-superellipse\u002F1.1 relative bg-token-sidebar-surface-primary\">\u003Cdiv class=\"@w-xl\u002Fmain:top-9 sticky top-[calc(--spacing(9)+var(--header-height))]\">\u003Cdiv class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\u003Cdiv class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"> \u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cpre>\u003Ccode class=\"language-plaintext\">Client (Canvas)\n  ↕ WebSocket\nWhiteboard Server (Go)\n  ↕ Broadcast\nAll clients in the same board\n\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cp> \u003C\u002Fp>\u003Ch3 data-start=\"994\" data-end=\"1012\">Key Components\u003C\u002Fh3>\u003Cul data-start=\"1014\" data-end=\"1281\">\u003Cli data-start=\"1014\" data-end=\"1063\">\u003Cp data-start=\"1016\" data-end=\"1063\">Canvas State – Current state of the board\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1064\" data-end=\"1109\">\u003Cp data-start=\"1066\" data-end=\"1109\">Draw Events – Stroke or shape actions\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1110\" data-end=\"1165\">\u003Cp data-start=\"1112\" data-end=\"1165\">Cursor Position – Each user's real-time pointer\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1166\" data-end=\"1217\">\u003Cp data-start=\"1168\" data-end=\"1217\">History Stack – For Undo\u002FRedo functionality\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1218\" data-end=\"1281\">\u003Cp data-start=\"1220\" data-end=\"1281\">Room (Board) – Scoped by \u003Ccode data-start=\"1249\" data-end=\"1259\">board_id\u003C\u002Fcode> for isolated sessions\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"1288\" data-end=\"1322\">✏️ 1. Drawing Event Data Format\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"1324\" data-end=\"1387\">Rather than syncing the whole canvas, we only send draw events:\u003C\u002Fp>\u003Cdiv class=\"contain-inline-size rounded-2xl corner-superellipse\u002F1.1 relative bg-token-sidebar-surface-primary\">\u003Cpre>\u003Ccode class=\"language-plaintext\">{\n  \"board_id\": \"board-001\",\n  \"user_id\": \"user-a\",\n  \"type\": \"draw\",\n  \"tool\": \"pen\",\n  \"points\": [\n    { \"x\": 120, \"y\": 240 },\n    { \"x\": 122, \"y\": 245 }\n  ],\n  \"color\": \"#FF0000\",\n  \"stroke\": 2 } \u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cp data-start=\"1601\" data-end=\"1631\"> \u003C\u002Fp>\u003Cp data-start=\"1601\" data-end=\"1631\">Supported event types include:\u003C\u002Fp>\u003Cul data-start=\"1633\" data-end=\"1737\">\u003Cli data-start=\"1633\" data-end=\"1656\">\u003Cp data-start=\"1635\" data-end=\"1656\">\u003Ccode data-start=\"1635\" data-end=\"1641\">draw\u003C\u002Fcode> (pen, brush)\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1633\" data-end=\"1656\">\u003Cp data-start=\"1635\" data-end=\"1656\">\u003Ccode data-start=\"1659\" data-end=\"1666\">shape\u003C\u002Fcode> (rectangle, circle, arrow)\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1696\" data-end=\"1708\">\u003Cp data-start=\"1698\" data-end=\"1708\">\u003Ccode data-start=\"1698\" data-end=\"1706\">cursor\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1709\" data-end=\"1727\">\u003Cp data-start=\"1711\" data-end=\"1727\">\u003Ccode data-start=\"1711\" data-end=\"1717\">undo\u003C\u002Fcode>, \u003Ccode data-start=\"1719\" data-end=\"1725\">redo\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"1728\" data-end=\"1737\">\u003Cp data-start=\"1730\" data-end=\"1737\">\u003Ccode data-start=\"1730\" data-end=\"1737\">clear\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"1744\" data-end=\"1785\">⚙️ 2. Server-side Data Structures (Go)\u003C\u002Fh2>\u003Cdiv class=\"contain-inline-size rounded-2xl corner-superellipse\u002F1.1 relative bg-token-sidebar-surface-primary\">\u003Cdiv class=\"@w-xl\u002Fmain:top-9 sticky top-[calc(--spacing(9)+var(--header-height))]\">\u003Cdiv class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\u003Cdiv class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"> \u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cpre>\u003Ccode class=\"language-plaintext\">type DrawEvent struct {\n\tBoardID string      `json:\"board_id\"`\n\tUserID  string      `json:\"user_id\"`\n\tType    string      `json:\"type\"`\n\tTool    string      `json:\"tool\"`\n\tPoints  []Point     `json:\"points,omitempty\"`\n\tColor   string      `json:\"color,omitempty\"`\n\tStroke  int         `json:\"stroke,omitempty\"`\n}\n\ntype Point struct {\n\tX float64 `json:\"x\"`\n\tY float64 `json:\"y\"`\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cp data-start=\"2178\" data-end=\"2266\"> \u003C\u002Fp>\u003Cp data-start=\"2178\" data-end=\"2266\">Each whiteboard session is managed via \u003Ccode data-start=\"2217\" data-end=\"2227\">board_id\u003C\u002Fcode> to broadcast only within its own room.\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"2273\" data-end=\"2306\">🔄 3. Real-time WebSocket Sync\u003C\u002Fh2>\u003Cdiv class=\"contain-inline-size rounded-2xl corner-superellipse\u002F1.1 relative bg-token-sidebar-surface-primary\">\u003Cdiv class=\"@w-xl\u002Fmain:top-9 sticky top-[calc(--spacing(9)+var(--header-height))]\">\u003Cdiv class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\u003Cdiv class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"> \u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cpre>\u003Ccode class=\"language-plaintext\">var boards = make(map[string]map[*websocket.Conn]bool)\n\nfunc handleWhiteboard(conn *websocket.Conn, boardID string) {\n\tif boards[boardID] == nil {\n\t\tboards[boardID] = make(map[*websocket.Conn]bool)\n\t}\n\tboards[boardID][conn] = true\n\n\tdefer func() {\n\t\tdelete(boards[boardID], conn)\n\t\tconn.Close()\n\t}()\n\n\tfor {\n\t\tvar event DrawEvent\n\t\tif err := conn.ReadJSON(&event); err != nil {\n\t\t\treturn\n\t\t}\n\t\tbroadcast(boardID, event)\n\t}\n}\n\nfunc broadcast(boardID string, event DrawEvent) {\n\tfor c := range boards[boardID] {\n\t\tc.WriteJSON(event)\n\t}\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cp data-start=\"2855\" data-end=\"2965\"> \u003C\u002Fp>\u003Cp data-start=\"2855\" data-end=\"2965\">Result: User A draws something → all users see it instantly\u003C\u002Fp>\u003Cp data-start=\"2855\" data-end=\"2965\">Latency: Millisecond-level performance\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"2972\" data-end=\"3011\">🖱️ 4. Real-time Mouse \u002F Cursor Sync\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"3013\" data-end=\"3057\">To show what others are doing on the canvas:\u003C\u002Fp>\u003Cdiv class=\"contain-inline-size rounded-2xl corner-superellipse\u002F1.1 relative bg-token-sidebar-surface-primary\">\u003Cpre>\u003Ccode class=\"language-plaintext\">{\n  \"type\": \"cursor\",\n  \"user_id\": \"user-b\",\n  \"x\": 450,\n  \"y\": 300 } \u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cp data-start=\"3144\" data-end=\"3186\"> \u003C\u002Fp>\u003Cul data-start=\"3142\" data-end=\"3238\">\u003Cli data-start=\"3142\" data-end=\"3186\">\u003Cp data-start=\"3144\" data-end=\"3186\">Clients send cursor position every ~50ms\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3187\" data-end=\"3238\">\u003Cp data-start=\"3189\" data-end=\"3238\">Server broadcasts to all clients in the same room\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"3245\" data-end=\"3275\">↩️ 5. Real-time Undo \u002F Redo\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Ch3 data-start=\"3277\" data-end=\"3289\">Concept:\u003C\u002Fh3>\u003Cul data-start=\"3291\" data-end=\"3360\">\u003Cli data-start=\"3291\" data-end=\"3323\">\u003Cp data-start=\"3293\" data-end=\"3323\">Each draw event = one action\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3324\" data-end=\"3360\">\u003Cp data-start=\"3326\" data-end=\"3360\">Maintain a history stack per board\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cdiv class=\"contain-inline-size rounded-2xl corner-superellipse\u002F1.1 relative bg-token-sidebar-surface-primary\">\u003Cdiv class=\"@w-xl\u002Fmain:top-9 sticky top-[calc(--spacing(9)+var(--header-height))]\">\u003Cdiv class=\"absolute end-0 bottom-0 flex h-9 items-center pe-2\">\u003Cdiv class=\"bg-token-bg-elevated-secondary text-token-text-secondary flex items-center gap-4 rounded-sm px-2 font-sans text-xs\"> \u003C\u002Fdiv>\u003C\u002Fdiv>\u003C\u002Fdiv>\u003Cpre>\u003Ccode class=\"language-plaintext\">type BoardHistory struct {\n\tUndo []DrawEvent\n\tRedo []DrawEvent\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cp data-start=\"3438\" data-end=\"3447\"> \u003C\u002Fp>\u003Ch3>Undo:\u003C\u002Fh3>\u003Cul data-start=\"3449\" data-end=\"3537\">\u003Cli data-start=\"3449\" data-end=\"3484\">\u003Cp data-start=\"3451\" data-end=\"3484\">Pop from \u003Ccode data-start=\"3460\" data-end=\"3466\">undo\u003C\u002Fcode>, push to \u003Ccode data-start=\"3476\" data-end=\"3482\">redo\u003C\u002Fcode>\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3485\" data-end=\"3537\">\u003Cp data-start=\"3487\" data-end=\"3537\">Broadcast to all clients to remove the last action\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"3544\" data-end=\"3576\">⚡ 6. Performance Optimization\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"3578\" data-end=\"3615\">Important when scaling to many users:\u003C\u002Fp>\u003Cul data-start=\"3617\" data-end=\"3838\">\u003Cli data-start=\"3617\" data-end=\"3661\">\u003Cp data-start=\"3619\" data-end=\"3661\">Send only deltas, not entire strokes\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3662\" data-end=\"3705\">\u003Cp data-start=\"3664\" data-end=\"3705\">Throttle cursor updates (30–60 fps)\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3706\" data-end=\"3735\">\u003Cp data-start=\"3708\" data-end=\"3735\">Batch frequent events\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3736\" data-end=\"3780\">\u003Cp data-start=\"3738\" data-end=\"3780\">Use binary protocol for large boards\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3781\" data-end=\"3838\">\u003Cp data-start=\"3783\" data-end=\"3838\">Split canvas into layers: background \u002F drawing \u002F cursor\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"3845\" data-end=\"3879\">🔐 7. Security & Access Control\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"3881\" data-end=\"3908\">Your system should include:\u003C\u002Fp>\u003Cul data-start=\"3910\" data-end=\"4074\">\u003Cli data-start=\"3910\" data-end=\"3957\">\u003Cp data-start=\"3912\" data-end=\"3957\">Board permissions (read \u002F write access)\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3958\" data-end=\"3986\">\u003Cp data-start=\"3960\" data-end=\"3986\">Rate limits per user\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"3987\" data-end=\"4039\">\u003Cp data-start=\"3989\" data-end=\"4039\">Shape validation to avoid malformed payloads\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4040\" data-end=\"4074\">\u003Cp data-start=\"4042\" data-end=\"4074\">Protection against spam\u002Fflooding\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"4081\" data-end=\"4109\">🚀 Mini Project Challenge\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"4111\" data-end=\"4150\">Try building a real demo that supports:\u003C\u002Fp>\u003Cul data-start=\"4152\" data-end=\"4274\">\u003Cli data-start=\"4152\" data-end=\"4186\">\u003Cp data-start=\"4154\" data-end=\"4186\">2–3 users drawing in real-time\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4187\" data-end=\"4202\">\u003Cp data-start=\"4189\" data-end=\"4202\">Cursor sync\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4203\" data-end=\"4224\">\u003Cp data-start=\"4205\" data-end=\"4224\">Instant Undo\u002FRedo\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4225\" data-end=\"4274\">\u003Cp data-start=\"4227\" data-end=\"4274\">Open multiple tabs they must stay 100% synced\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp data-start=\"4227\" data-end=\"4274\"> \u003C\u002Fp>\u003Cp data-start=\"4276\" data-end=\"4367\">✅ If you can build all this, you’ve truly mastered real-time drawing synchronization 🎯\u003C\u002Fp>\u003Cp data-start=\"4276\" data-end=\"4367\"> \u003C\u002Fp>\u003Chr>\u003Cp> \u003C\u002Fp>\u003Ch2 data-start=\"4374\" data-end=\"4442\">🔮 Coming Next: EP.121 Deploying WebSocket Server on Kubernetes\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp data-start=\"4444\" data-end=\"4490\">In the next episode, we’ll go full production.\u003C\u002Fp>\u003Cp data-start=\"4492\" data-end=\"4512\">You’ll learn how to:\u003C\u002Fp>\u003Cul data-start=\"4514\" data-end=\"4681\">\u003Cli data-start=\"4514\" data-end=\"4566\">\u003Cp data-start=\"4516\" data-end=\"4566\">Deploy your WebSocket Server with Kubernetes\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4567\" data-end=\"4616\">\u003Cp data-start=\"4569\" data-end=\"4616\">Set up Load Balancer with Sticky Sessions\u003C\u002Fp>\u003C\u002Fli>\u003Cli data-start=\"4617\" data-end=\"4681\">\u003Cp data-start=\"4619\" data-end=\"4681\">Implement Auto-Scaling to support thousands of connections\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp data-start=\"4683\" data-end=\"4697\">Stay tuned! 🚀\u003C\u002Fp>\u003Cp data-start=\"4683\" data-end=\"4697\"> \u003C\u002Fp>\u003Cdiv class=\"raw-html-embed\">\u003Cdiv style=\"margin:0 0 6px 0; 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