[{"data":1,"prerenderedAt":1215},["ShallowReactive",2],{"docs-\u002Fdocs\u002Fnode-red-guide\u002Fpatterns\u002Fdesign-patterns\u002F":3,"featureCatalog":263,"docs-nav":668},{"id":4,"title":5,"body":6,"description":19,"editUrl":252,"extension":253,"layout":254,"meta":255,"navGroup":254,"navGroupOrder":254,"navOrder":256,"navTitle":5,"navigation":257,"originalPath":254,"path":258,"redirect":254,"seo":259,"stem":260,"updated":261,"version":254,"__hash__":262},"docs\u002Fdocs\u002Fnode-red-guide\u002Fpatterns\u002Fdesign-patterns.md","Design patterns",{"type":7,"value":8,"toc":248},"minimark",[9,13,20,31],[10,11,5],"h1",{"id":12},"design-patterns",[14,15,16],"p",{},[17,18,19],"strong",{},"Design patterns — pick how a flow is structured and reused",[14,21,22,23,26,27,30],{},"A design pattern is a structural choice you make for a piece of a flow. Building a flow you'll select one or more: first ",[17,24,25],{},"find the seams"," — the components the flow really breaks into — then, for each piece worth reusing, pick the ",[17,28,29],{},"level of reuse"," that fits. Reuse is a ladder — link in\u002Fout → link call → subflow → palette node — and each rung up buys more reuse but costs more to build and maintain, so climb only when the rung below won't do.",[32,33,34,91,141,181,214],"guide-tabs",{},[35,36,38,44,47,52,55,83],"guide-tab",{"label":37},"Find the seams",[14,39,40,43],{},[17,41,42],{},"Name the pieces first"," — before any reuse, find the components hiding in the flow and draw a box around each.",[14,45,46],{},"Most spaghetti is three or four well-defined components that were never named. A giant flow is bad because it has no seams: you can't reuse, test, or hand off part of a blob, and any edit means reading the whole tab. Naming the structure is the fix — not tidier wires.",[48,49],"flow-diagram",{":edges":50,":nodes":51},"[\"ingest>normalize\",\"normalize>enrich\",\"enrich>publish\"]","[{\"id\":\"ingest\",\"label\":\"Ingest\",\"accent\":\"indigo\"},{\"id\":\"normalize\",\"label\":\"Normalize\",\"accent\":\"indigo\"},{\"id\":\"enrich\",\"label\":\"Enrich\",\"accent\":\"indigo\"},{\"id\":\"publish\",\"label\":\"Publish\",\"accent\":\"indigo\"}]",[14,53,54],{},"Look for one of these and box it off:",[56,57,58,65,71,77],"ul",{},[59,60,61,64],"li",{},[17,62,63],{},"A repeated cluster"," — the same three or four nodes appearing in more than one place.",[59,66,67,70],{},[17,68,69],{},"A logical stage"," — ingest, normalize, enrich, publish; each a bounded step with a clear input and output.",[59,72,73,76],{},[17,74,75],{},"A bounded responsibility"," — one thing the piece owns from end to end.",[59,78,79,82],{},[17,80,81],{},"A reuse magnet"," — a piece other flows will obviously want.",[14,84,85,86,90],{},"Once the seams are named, each becomes a candidate for reuse — and ",[87,88,89],"em",{},"how"," you reuse it is the choice in the tabs that follow. A piece you'll only ever use once still earns its box; it just stays a plain seam.",[35,92,94,103,110,116,119,125,135],{"label":93},"Link in \u002F out",[14,95,96,99,100],{},[17,97,98],{},"Route within one instance"," — ",[87,101,102],{},"local · organization, not reuse.",[14,104,105,106,109],{},"Link in and link out route messages between points and tabs inside a single Node-RED instance, without dragging a wire across the canvas. One link out can feed many link ins — ",[17,107,108],{},"one producer, many consumers"," — so it's the clean way to fan a message out to several independent paths.",[48,111],{":edges":112,":nodes":113,"align":114,":legend":115},"[\"prod>lout\",{\"from\":\"lout\",\"to\":\"lin1\",\"dashed\":true,\"label\":\"link\"},{\"from\":\"lout\",\"to\":\"lin2\",\"dashed\":true},{\"from\":\"lout\",\"to\":\"lin3\",\"dashed\":true},\"lin1>c1\",\"lin2>c2\",\"lin3>c3\"]","[{\"id\":\"prod\",\"label\":\"producer\",\"sub\":\"one source\",\"accent\":\"indigo\",\"col\":1,\"row\":2},{\"id\":\"lout\",\"label\":\"link out\",\"sub\":\"broadcast\",\"accent\":\"indigo\",\"col\":2,\"row\":2},{\"id\":\"lin1\",\"label\":\"link in\",\"accent\":\"indigo\",\"col\":3,\"row\":1},{\"id\":\"c1\",\"label\":\"consumer A\",\"accent\":\"slate\",\"col\":4,\"row\":1},{\"id\":\"lin2\",\"label\":\"link in\",\"accent\":\"indigo\",\"col\":3,\"row\":2},{\"id\":\"c2\",\"label\":\"consumer B\",\"accent\":\"slate\",\"col\":4,\"row\":2},{\"id\":\"lin3\",\"label\":\"link in\",\"accent\":\"indigo\",\"col\":3,\"row\":3},{\"id\":\"c3\",\"label\":\"consumer C\",\"accent\":\"slate\",\"col\":4,\"row\":3}]","left","[{\"line\":\"neutral\",\"dashed\":true,\"label\":\"link out → link in\"}]",[14,117,118],{},"Nothing is packaged or reused, though — the message just teleports to the matching link.",[14,120,121,124],{},[17,122,123],{},"Select it when"," — you need to tidy wiring, route between tabs, or fan one message out to several consumers. It's the bottom rung: routing and organization, no reuse of logic.",[14,126,127,130,131,134],{},[17,128,129],{},"Not this when"," — you're trying to share ",[87,132,133],{},"work",". The moment more than one path needs the same logic or resource, climb to a link call.",[14,136,137,140],{},[17,138,139],{},"Stays local"," — link in\u002Fout never leave the instance and distribute nothing.",[35,142,144,152,155,161,166,176],{"label":143},"Link call",[14,145,146,99,149],{},[17,147,148],{},"A shared, returning service",[87,150,151],{},"local · one instance.",[14,153,154],{},"Turn a link-in \u002F link-out pair into a callable service: a piece of work exposed once that any path calls and that returns the result to whoever called it, with no central router to build. It's the workhorse for shared services inside one instance — a database pool, a model call, a broker connection, a common transform.",[48,156],{":edges":157,":nodes":158,"align":114,":groups":159,":legend":160},"[\"in>lc\",\"lc>resp\",\"lin>pool\",\"pool>lout\",{\"from\":\"lc\",\"to\":\"lin\",\"dashed\":true,\"label\":\"call\",\"accent\":\"teal\"},{\"from\":\"lout\",\"to\":\"lc\",\"dashed\":true,\"label\":\"return\",\"accent\":\"teal\"}]","[{\"id\":\"in\",\"label\":\"http in\",\"sub\":\"a request\",\"accent\":\"indigo\",\"col\":1,\"row\":1},{\"id\":\"lc\",\"label\":\"link call\",\"sub\":\"calls the service\",\"accent\":\"teal\",\"col\":2,\"row\":1},{\"id\":\"resp\",\"label\":\"http response\",\"sub\":\"the end · sends result\",\"accent\":\"indigo\",\"col\":3,\"row\":1},{\"id\":\"lin\",\"label\":\"link in\",\"sub\":\"service entry\",\"accent\":\"green\",\"col\":1,\"row\":2},{\"id\":\"pool\",\"label\":\"SQL pool\",\"sub\":\"one shared connection\",\"accent\":\"green\",\"col\":2,\"row\":2},{\"id\":\"lout\",\"label\":\"link out\",\"sub\":\"return mode\",\"accent\":\"green\",\"col\":3,\"row\":2}]","[{\"id\":\"svc\",\"label\":\"Shared service · every path calls this one link in\",\"accent\":\"green\",\"nodes\":[\"lin\",\"pool\",\"lout\"]}]","[{\"line\":\"teal\",\"dashed\":true,\"label\":\"call \u002F return\"}]",[14,162,163,165],{},[17,164,123],{}," — more than one path needs the same resource or logic and you don't want a copy per path. Each path calls the one shared service, the result comes back, and the path finishes at its own sink — an http response here. No funnel: the shared service has exactly one wire in.",[14,167,168,171,172,175],{},[17,169,170],{},"The trade-off"," — every caller shares ",[87,173,174],{},"one"," configuration. That's the point when the config is fixed; it's the limit when each use needs its own settings — which is when you climb to a subflow.",[14,177,178,180],{},[17,179,139],{}," — reuse within one instance; it doesn't package or distribute.",[35,182,184,192,199,204,209],{"label":183},"Subflow",[14,185,186,99,189],{},[17,187,188],{},"A packaged set of actions, with its own config",[87,190,191],{},"cross-instance.",[14,193,194,195,198],{},"A subflow bundles a ",[87,196,197],{},"set of actions"," — several nodes — into one reusable node you can drop into a flow many times, each instance carrying its own configuration. Unlike a link call, which shares one fixed config, a subflow is a packaged assembly that varies per drop, and it travels between Node-RED instances.",[48,200],{":edges":201,":nodes":202,"align":114,":groups":203},"[\"a1>a2\",\"a2>a3\",{\"from\":\"def\",\"to\":\"uses\",\"dashed\":true,\"label\":\"packaged as one node\"}]","[{\"id\":\"a1\",\"label\":\"validate\",\"col\":1,\"row\":1},{\"id\":\"a2\",\"label\":\"transform\",\"col\":2,\"row\":1},{\"id\":\"a3\",\"label\":\"publish\",\"col\":3,\"row\":1},{\"id\":\"n1\",\"label\":\"subflow\",\"sub\":\"config A\",\"accent\":\"indigo\",\"col\":1,\"row\":2},{\"id\":\"n2\",\"label\":\"subflow\",\"sub\":\"config B\",\"accent\":\"indigo\",\"col\":2,\"row\":2},{\"id\":\"n3\",\"label\":\"subflow\",\"sub\":\"config C\",\"accent\":\"indigo\",\"col\":3,\"row\":2}]","[{\"id\":\"def\",\"label\":\"Subflow · a set of actions packaged into one node, authored once\",\"accent\":\"teal\",\"nodes\":[\"a1\",\"a2\",\"a3\"]},{\"id\":\"uses\",\"label\":\"Reused · that one node dropped in, each with its own config\",\"accent\":\"indigo\",\"nodes\":[\"n1\",\"n2\",\"n3\"]}]",[14,205,206,208],{},[17,207,123],{}," — a piece needs per-instance config (the same logic, different settings each place), or you need to reuse it across other Node-RED instances. Start as a link call and promote to a subflow only once it earns that.",[14,210,211,213],{},[17,212,170],{}," — heavier than a link call: each instance duplicates its connections, and defaulting to subflows for everything adds indirection. Use it for genuine per-instance reuse, not as the default.",[35,215,217,225,238,243],{"label":216},"Palette node",[14,218,219,99,222],{},[17,220,221],{},"Real packaged code",[87,223,224],{},"distributed.",[14,226,227,228,231,232,237],{},"The top rung: package a piece as an installable palette node — real code, versioned and installed like any library dependency. It's the same ",[17,229,230],{},"custom node"," the ",[233,234,236],"a",{"href":235},"\u002Fdocs\u002Fapplication-guide\u002Fapp-delivery-methods\u002F","FlowFuse app delivery methods"," publish for reuse across apps, and the point where Node-RED reuse hands off to the FlowFuse guide's distribution story.",[14,239,240,242],{},[17,241,123],{}," — a piece is used across many projects or teams and deserves to be versioned, installed, and upgraded like a dependency — not copied, and beyond what a shared subflow can carry.",[14,244,245,247],{},[17,246,170],{}," — it's real code with a real release cycle: a package to build, test, and maintain. The most powerful reuse and the most to own. 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data queries and actions through a single chat interface.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fchat\u002F#insights-mode",{"edge":257,"hub":257,"fleet":257},{"id":309,"title":310,"description":311,"docsLink":312,"changelog":313,"tiers":317},"third-party-agents","Connect Your Own AI Agent","Point the AI agent your company already uses at FlowFuse, so it can query your teams and instances and build Node-RED applications, with you deciding which teams it reaches and whether it can make changes.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fthird-party-agents\u002F",[314],{"url":315,"release":316},"\u002Fchangelog\u002F2026\u002F08\u002Fconnect-your-own-ai-agent\u002F","3.0",{"edge":257,"hub":257,"fleet":257},{"id":319,"title":320,"description":321,"docsLink":322,"tiers":323},"mcp-servers","Agentic Operations","Expose your Node-RED flows as tools an AI agent can call directly, so agents can query the state of the factory or trigger actions without custom integration work.","\u002Fnode-red\u002Fflowfuse\u002Fmcp\u002F",{"edge":257,"hub":257,"fleet":257},{"id":325,"title":326,"description":327,"tiers":328},"onnx-integration","ONNX Integration","Run trained machine learning models directly in your flows, including on edge hardware, without sending data out to an external inference service.",{"edge":257,"hub":257,"fleet":257},{"id":330,"title":331,"features":332},"build","Build",[333,339,345,355,361,367,371,377,383,391,397,401,405,414,422],{"id":334,"title":335,"description":336,"docsLink":337,"tiers":338},"edge-development","Edge Development","Develop and test Node-RED flows directly on edge devices with a remote editor proxy.","\u002Fdocs\u002Fdevice-agent\u002Fquickstart\u002F",{"edge":257,"hub":290,"fleet":257},{"id":340,"title":341,"description":342,"docsLink":343,"tiers":344},"private-npm-registry","Custom Node-RED Nodes","Create and manage your own private npm registry for Node-RED nodes, so you can share custom nodes across your team and 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instances.","\u002Fdocs\u002Finstall\u002Ffile-storage\u002F",{"edge":257,"hub":257,"fleet":257},{"id":362,"title":363,"description":364,"docsLink":365,"showOnPricing":290,"tiers":366},"persistent-context","Persistent Context","In-memory values defined in a Node-RED flow persist across project restarts and upgrades.","\u002Fdocs\u002Fuser\u002Fpersistent-context\u002F",{"edge":257,"hub":257,"fleet":257},{"id":368,"title":369,"showOnPricing":290,"tiers":370},"static-assets","Static Assets",{"edge":257,"hub":257,"fleet":257},{"id":372,"title":373,"description":374,"docsLink":375,"tiers":376},"team-library","Team Library","Set up standard nodes and flows that can be shared with all team members across your organisation.","\u002Fdocs\u002Fuser\u002Fshared-library\u002F",{"edge":257,"hub":257,"fleet":257},{"id":378,"title":379,"description":380,"docsLink":381,"tiers":382},"personalised-multi-user-dashboards","Personalised Multi-User Dashboards","Build applications that provide unique data to each logged-in user using personalised multi-user dashboards.","https:\u002F\u002Fdashboard.flowfuse.com\u002Fuser\u002Fmulti-tenancy.html",{"edge":257,"hub":257,"fleet":257},{"id":384,"title":385,"description":386,"changelog":387,"subfeature":257,"showOnPricing":290,"tiers":390},"dashboards-view","Dashboards View","Browse and open every dashboard across your team from a dedicated Dashboards view, at both team and application level, without leaving FlowFuse.",[388],{"url":389,"release":353},"\u002Fchangelog\u002F2026\u002F07\u002Fteam-and-application-dashboards\u002F",{"edge":257,"hub":257,"fleet":257},{"id":392,"title":393,"description":394,"docsLink":395,"tiers":396},"blueprints-converge","Blueprints","Ready-made starting points for your apps, from cross-team Converge templates to OT and IT specific 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Your preferences are remembered between sessions.",[419],{"url":420,"release":300},"\u002Fchangelog\u002F2026\u002F04\u002Fimmersive-editor-drawer\u002F",{"edge":257,"hub":257,"fleet":257},{"id":423,"title":424,"description":425,"changelog":426,"showOnPricing":290,"tiers":429},"embedded-editor-tab-title","Embedded Editor Browser Tab Title","The browser tab title updates to reflect the active Node-RED canvas tab when working in the embedded editor.",[427],{"url":428,"release":412},"\u002Fchangelog\u002F2026\u002F03\u002Fembedded-editor-tab-title\u002F",{"edge":257,"hub":257,"fleet":257},{"id":431,"title":432,"features":433},"deploy","Deploy",[434,440,449,455,461,467,473,479,484],{"id":435,"title":436,"description":437,"docsLink":438,"tiers":439},"hosted-instances","Cloud Instances","Run Node-RED instances managed and hosted by FlowFuse.","\u002Fdocs\u002Fuser\u002Fintroduction\u002F#creating-a-node-red-instance",{"edge":257,"hub":257,"fleet":257},{"id":441,"title":442,"description":443,"docsLink":444,"changelog":445,"tiers":448},"edge-devices","Edge Instances","Deploy and mange your Node-RED instances on edge PLCs and gateways, with full visibility and control from the cloud.","\u002Fdocs\u002Fdevice-agent\u002Fintroduction\u002F",[446],{"url":447,"release":280},"\u002Fchangelog\u002F2026\u002F02\u002Fdevice-agent-nodejs-options\u002F",{"edge":257,"hub":290,"fleet":257},{"id":450,"title":451,"description":452,"docsLink":453,"tiers":454},"custom-hostnames","Custom Hostnames","Access your Node-RED application via your own domain name.","\u002Fdocs\u002Fuser\u002Fcustom-hostnames\u002F",{"edge":290,"hub":257,"fleet":290},{"id":456,"title":457,"description":458,"docsLink":459,"tiers":460},"mqtt-broker","MQTT Broker","Manage and create MQTT clients to transport data for efficient messaging and communication within your applications.","\u002Fdocs\u002Fuser\u002Fteambroker\u002F",{"edge":257,"hub":290,"fleet":257},{"id":462,"title":463,"description":464,"docsLink":465,"showOnPricing":290,"tiers":466},"project-nodes","Project Nodes aka seamless project comms","FlowFuse Project Nodes enable the passing of data and messages between your Node-RED projects.","\u002Fdocs\u002Fuser\u002Fprojectnodes\u002F",{"edge":257,"hub":257,"fleet":257},{"id":468,"title":469,"description":470,"docsLink":471,"tiers":472},"devops-pipelines","DevOps Pipelines","Set up different environments for development, testing, and production Node-RED instances to support a full software delivery lifecycle.","\u002Fdocs\u002Fuser\u002Fdevops-pipelines\u002F",{"edge":257,"hub":257,"fleet":257},{"id":474,"title":475,"description":476,"docsLink":477,"tiers":478},"git-integration","Git Integration","Back up your flows to a remote Git repository through a DevOps Pipeline. 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