[{"data":1,"prerenderedAt":1830},["ShallowReactive",2],{"docs-\u002Fdocs\u002Fnode-red\u002Fprotocol\u002Fwebsocket\u002F":3,"featureCatalog":373,"docs-nav":777},{"id":4,"title":5,"body":6,"description":16,"editUrl":362,"extension":363,"layout":364,"meta":365,"metaTitle":5,"navGroup":364,"navGroupOrder":364,"navOrder":366,"navTitle":367,"navigation":172,"originalPath":364,"path":368,"redirect":364,"seo":369,"stem":370,"updated":371,"version":364,"__hash__":372},"docs\u002Fdocs\u002Fnode-red\u002Fprotocol\u002Fwebsocket.md","Using Websocket with Node-RED",{"type":7,"value":8,"toc":342},"minimark",[9,13,17,22,25,28,32,43,46,49,52,55,59,62,79,83,86,91,129,135,139,163,167,185,196,246,249,253,260,264,267,271,293,297,317,321,332,335],[10,11,5],"h1",{"id":12},"using-websocket-with-node-red",[14,15,16],"p",{},"This guide covers WebSocket communication in Node-RED. You'll learn how to connect as a client and set up your own WebSocket server.",[18,19,21],"h2",{"id":20},"what-is-websocket","What is Websocket?",[14,23,24],{},"WebSocket enables real-time, bidirectional communication between clients (web browsers, IoT devices, etc.) and servers. Think of it as keeping a phone line open instead of hanging up and calling back for every message.",[14,26,27],{},"Traditional HTTP works like sending letters back and forth - each request needs its own connection. WebSocket keeps a single connection alive, letting both sides send messages whenever they need to. This makes it ideal for applications that need instant data exchange.",[18,29,31],{"id":30},"how-does-websocket-work","How Does WebSocket Work?",[14,33,34,40],{},[35,36],"img",{"alt":37,"dataZoomable":38,"src":39},"WebSocket connection establishment process","","\u002Fdocs\u002Fnode-red\u002Fprotocol\u002Fimages\u002Fwebsocket-handshake.png",[41,42,37],"em",{},[14,44,45],{},"WebSocket establishes a persistent connection between a client (such as a web browser or IoT device) and a server. The process begins when the client sends an initial HTTP request to the server, indicating a desire to upgrade to a WebSocket connection. If the server supports WebSocket, it responds with a confirmation, and the connection is established.",[14,47,48],{},"Once the connection is open, both the client and server can send messages to each other at any time. This two-way communication allows for real-time data exchange without the need to re-establish connections for each message. When the communication is no longer needed, either party can close the connection.",[18,50,5],{"id":51},"using-websocket-with-node-red-1",[14,53,54],{},"This document will explain how to communicate as both a server and a client using WebSocket in Node-RED. Practical examples will be provided to help you follow along, ensuring a comprehensive understanding of the concepts.",[18,56,58],{"id":57},"understanding-servers-and-clients-in-websocket-context","Understanding Servers and Clients in WebSocket Context",[14,60,61],{},"In the context of WebSocket communication:",[63,64,65,73],"ul",{},[66,67,68,72],"li",{},[69,70,71],"strong",{},"WebSocket Server:"," The WebSocket server is a application (such as a web browser or IoT device) that listens for incoming WebSocket connection requests from clients. It manages these connections and facilitates the exchange of messages in real time. The server can handle multiple clients simultaneously, allowing for concurrent communication.",[66,74,75,78],{},[69,76,77],{},"WebSocket Client:"," The WebSocket client is the application (such as a web browser or IoT device) that initiates the connection to the WebSocket server. It sends requests to establish a WebSocket connection and can send and receive messages at any time once the connection is active.",[18,80,82],{"id":81},"building-a-websocket-server-in-node-red-and-communicating-with-clients","Building a WebSocket Server in Node-RED and Communicating with Clients",[14,84,85],{},"Before creating the server, it's important to understand that we will need to listen for incoming messages as well as send messages. Let’s first create the server to listen for connections.",[87,88,90],"h3",{"id":89},"building-the-websocket-server-to-listen","Building the WebSocket Server to Listen",[92,93,94,101,104,107,115,122],"ol",{},[66,95,96,97,100],{},"Drag the ",[69,98,99],{},"WebSocket In"," node onto the canvas.",[66,102,103],{},"Double-click the node and select the type as \"Listen On.\"",[66,105,106],{},"Click on the \"+\" icon to add the WebSocket configuration.",[66,108,109,110,114],{},"Enter the path you want to listen on as the server (e.g., ",[111,112,113],"code",{},"\u002Fws\u002Flisten",").",[66,116,117,118,121],{},"Choose whether you want to send and receive the entire message or only ",[111,119,120],{},"msg.payload",".",[66,123,124,125,128],{},"Drag a ",[69,126,127],{},"Debug"," node onto the canvas and connect it to the WebSocket In node. This will allow you to see incoming messages in the debug window.",[14,130,131,134],{},[69,132,133],{},"Note",": By default, the payload will contain the data sent over or received from the WebSocket. If configured to send the entire message, the object will be in JSON string format.",[87,136,138],{"id":137},"making-the-server-able-to-send-data-to-clients","Making the Server Able to Send Data to Clients",[92,140,141,147,153,156],{},[66,142,96,143,146],{},[69,144,145],{},"Inject"," node onto the canvas. This node will be used to send example data, but you can use any other data source node that you wish.",[66,148,96,149,152],{},[69,150,151],{},"WebSocket Out"," node onto the canvas. Double-click it and set the type to \"Listen On.\"",[66,154,155],{},"In the URL field, select the configuration you added while building the server in the previous section.",[66,157,158,159,162],{},"Click the ",[69,160,161],{},"Deploy"," button to activate your flow.",[87,164,166],{"id":165},"testing-the-websocket-server","Testing the WebSocket Server",[14,168,169,182],{},[170,171,177],"video",{"autoPlay":172,"loop":172,"muted":172,"playsInline":172,"ariaLabel":173,"width":174,"height":175,"preload":176},true,"Testing Server with Client",1920,832,"none",[178,179],"source",{"src":180,"type":181},"\u002Fdocs\u002Fnode-red\u002Fprotocol\u002Fimages\u002Fserver-testing.webm","video\u002Fwebm",[41,183,184],{},"Testing the WebSocket server with a Websocket client",[14,186,187,188,195],{},"Now that you have deployed the Node-RED flow, it is acting as a server that can both send and receive data. To test the server, you can use the ",[189,190,194],"a",{"href":191,"rel":192},"https:\u002F\u002Fchromewebstore.google.com\u002Fdetail\u002Fsimple-websocket-client\u002Fpfdhoblngboilpfeibdedpjgfnlcodoo?hl=en",[193],"nofollow","Simple WebSocket Client"," extension in your browser. Make sure to install this extension if you want to test the server.",[92,197,198,224,230,237],{},[66,199,200,201],{},"In the extension interface, enter the URL to connect to your server:\n",[63,202,203,209],{},[66,204,205,206],{},"For a deployed server: ",[111,207,208],{},"wss:\u002F\u002F\u003Cinstance-name>\u002Fws\u002Flisten",[66,210,211,212,215,216,219,220,223],{},"For a local server: ",[111,213,214],{},"ws:\u002F\u002Flocalhost:1880\u002Fws\u002Flisten"," (Note: Use ",[111,217,218],{},"ws"," for unencrypted connections and ",[111,221,222],{},"wss"," for encrypted connections.)",[66,225,158,226,229],{},[69,227,228],{},"Open"," button to connect to the server. Once connected, you should see the status change to \"opened.\"",[66,231,232,233,236],{},"In the request field, enter the message you want to send to the server and click ",[69,234,235],{},"Send",". You will see the message printed in the debug window of Node-RED.",[66,238,239,240,242,243,245],{},"To send a message from websocket server created in Node-RED to the client, click the ",[69,241,145],{}," button with ",[111,244,120],{}," set to the data you want to send. In the extension interface, you will see the sent data in the message log.",[14,247,248],{},"With these steps, you will have successfully set up a WebSocket server in Node-RED and tested its functionality as both a server and client. This setup allows for real-time communication, which is essential for many applications.",[87,250,252],{"id":251},"sending-data-from-node-red","Sending Data from Node-RED",[14,254,255,256,242,258,245],{},"To send a message from Node-RED to the client, click the ",[69,257,145],{},[111,259,120],{},[18,261,263],{"id":262},"connecting-to-a-websocket-server-as-a-client-in-node-red-and-communicating","Connecting to a WebSocket Server as a client in Node-RED and communicating",[14,265,266],{},"Now, as the section states, we are going to see how you can connect to the WebSocket server as the client. To move further, ensure that you have a server to connect to, which you can create as shown in the above section in Node-RED.",[87,268,270],{"id":269},"connecting-to-the-websocket-server-for-incoming-messages","Connecting to the WebSocket Server for Incoming Messages",[92,272,273,277,280,282,285,288],{},[66,274,96,275,100],{},[69,276,99],{},[66,278,279],{},"Double-click on it and select the type as \"Connect To.\"",[66,281,106],{},[66,283,284],{},"Enter the WebSocket server URL you want to connect to.",[66,286,287],{},"Select 'payload' in the Send\u002FReceive.",[66,289,96,290,292],{},[69,291,127],{}," node onto the canvas and connect it to the WebSocket In node.",[87,294,296],{"id":295},"making-the-client-able-to-send-messages","Making the Client Able to Send Messages",[92,298,299,304,309,312],{},[66,300,96,301,303],{},[69,302,145],{}," node onto the canvas. This node will be used to send example data.",[66,305,96,306,308],{},[69,307,151],{}," node onto the canvas. Double-click it and set the type to \"Connect To.\"",[66,310,311],{},"In the URL field, select the configuration you added while connecting to the server for listening to incoming messages.",[66,313,158,314,316],{},[69,315,161],{}," button.",[87,318,320],{"id":319},"testing-the-websocket-client","Testing the WebSocket Client",[14,322,323,329],{},[170,324,326],{"autoPlay":172,"loop":172,"muted":172,"playsInline":172,"ariaLabel":325,"width":174,"height":175,"preload":176},"Testing Client with Server",[178,327],{"src":328,"type":181},"\u002Fdocs\u002Fnode-red\u002Fprotocol\u002Fimages\u002Fclient-testing.webm",[41,330,331],{},"Testing Websocket Client with Websocket Server",[14,333,334],{},"Now, to test the client, you can send messages from the server and see the debug window for that message in the client instance. Similarly, you can send messages from the client Instance to the server and observe the responses in the debug window of server instance.",[14,336,337,338],{},"For more information on the advaced websocket node configuration refer to the ",[189,339,341],{"href":340},"\u002Fdocs\u002Fnode-red\u002Fcore-nodes\u002Fnetwork\u002Fwebsocket\u002F","Websocket Node Documentation",{"title":38,"searchDepth":343,"depth":343,"links":344},4,[345,347,348,349,350,357],{"id":20,"depth":346,"text":21},2,{"id":30,"depth":346,"text":31},{"id":51,"depth":346,"text":5},{"id":57,"depth":346,"text":58},{"id":81,"depth":346,"text":82,"children":351},[352,354,355,356],{"id":89,"depth":353,"text":90},3,{"id":137,"depth":353,"text":138},{"id":165,"depth":353,"text":166},{"id":251,"depth":353,"text":252},{"id":262,"depth":346,"text":263,"children":358},[359,360,361],{"id":269,"depth":353,"text":270},{"id":295,"depth":353,"text":296},{"id":319,"depth":353,"text":320},"https:\u002F\u002Fgithub.com\u002FFlowFuse\u002Fwebsite\u002Fedit\u002Fmain\u002Fnuxt\u002Fcontent-guides\u002Fnode-red\u002Fprotocol\u002Fwebsocket.md","md",null,{},50,"Websocket","\u002Fdocs\u002Fnode-red\u002Fprotocol\u002Fwebsocket",{"title":5,"description":16},"docs\u002Fnode-red\u002Fprotocol\u002Fwebsocket","2026-09-08 11:13:32 +0200","KeESHdULza_mjdoGfWEl48x9pWqWz4PWedCg4_369O0",{"id":374,"extension":375,"meta":376,"sections":377,"stem":775,"__hash__":776},"featureCatalog\u002Ffeature-catalog.yml","yml",{},[378,439,540,601,678,757],{"id":379,"title":380,"features":381},"ai-automation","AI & Automation",[382,392,402,412,418,428,434],{"id":383,"title":384,"description":385,"docsLink":386,"changelog":387,"tiers":391},"flowfuse-expert-ai","FlowFuse Expert AI","Build industrial apps with agents, and query the state of the factory with an agent. Adapt your current hardware and machines so agentic work can be done against them, without ripping and replacing what's already on the plant floor.","\u002Fdocs\u002Fuser\u002Fexpert\u002F",[388],{"url":389,"release":390},"\u002Fchangelog\u002F2026\u002F02\u002Fff-expert-update-banner\u002F","2.28",{"edge":172,"hub":172,"fleet":172},{"id":393,"title":394,"description":395,"docsLink":396,"changelog":397,"subfeature":172,"showOnPricing":400,"tiers":401},"flowfuse-expert-support-mode","Support Mode","Chat-based assistance for FlowFuse and Node-RED, including Node-RED instance management through natural language.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fchat\u002F#support-mode",[398],{"url":399,"release":390},"\u002Fchangelog\u002F2026\u002F02\u002Fff-expert-debug-log-context\u002F",false,{"edge":172,"hub":172,"fleet":172},{"id":403,"title":404,"description":405,"docsLink":406,"changelog":407,"subfeature":172,"showOnPricing":400,"tiers":411},"flowfuse-expert-application-building","Application Building","Describe what you want to build and FlowFuse Expert assembles it on your workspace, adding tabs, wiring nodes, and configuring properties.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fchat\u002F",[408],{"url":409,"release":410},"\u002Fchangelog\u002F2026\u002F05\u002Fexpert-application-building\u002F","2.30",{"edge":172,"hub":172,"fleet":172},{"id":413,"title":414,"description":415,"docsLink":416,"subfeature":172,"beta":172,"showOnPricing":400,"tiers":417},"flowfuse-expert-insights-mode","Insights Mode","Connects FlowFuse Expert to MCP servers in your Node-RED instances, enabling real-time data queries and actions through a single chat interface.","\u002Fdocs\u002Fuser\u002Fexpert\u002Fchat\u002F#insights-mode",{"edge":172,"hub":172,"fleet":172},{"id":419,"title":420,"description":421,"docsLink":422,"changelog":423,"tiers":427},"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",[424],{"url":425,"release":426},"\u002Fchangelog\u002F2026\u002F08\u002Fconnect-your-own-ai-agent\u002F","3.0",{"edge":172,"hub":172,"fleet":172},{"id":429,"title":430,"description":431,"docsLink":432,"tiers":433},"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.","\u002Fdocs\u002Fflowfuse-nodes\u002Fmcp\u002F",{"edge":172,"hub":172,"fleet":172},{"id":435,"title":436,"description":437,"tiers":438},"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":172,"hub":172,"fleet":172},{"id":440,"title":441,"features":442},"build","Build",[443,449,455,465,471,477,481,487,493,501,507,511,515,524,532],{"id":444,"title":445,"description":446,"docsLink":447,"tiers":448},"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":172,"hub":400,"fleet":172},{"id":450,"title":451,"description":452,"docsLink":453,"tiers":454},"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 devices without publishing them publicly.","\u002Fdocs\u002Fuser\u002Fcustom-npm-packages\u002F",{"edge":172,"hub":172,"fleet":172},{"id":456,"title":457,"description":458,"docsLink":459,"changelog":460,"tiers":464},"flowfuse-tables","FlowFuse Tables","A managed PostgreSQL database for every application, so you can store and query structured data without standing up and maintaining your own database.","\u002Fdocs\u002Fuser\u002Fff-tables\u002F",[461],{"url":462,"release":463},"\u002Fchangelog\u002F2026\u002F07\u002Fexpert-tables-automation\u002F","2.33",{"edge":172,"hub":172,"fleet":172},{"id":466,"title":467,"description":468,"docsLink":469,"tiers":470},"persistent-files","File Storage","Store and retrieve files from your Node-RED flows, with automatic replication and backup across your devices and hosted instances.","\u002Fdocs\u002Finstall\u002Ffile-storage\u002F",{"edge":172,"hub":172,"fleet":172},{"id":472,"title":473,"description":474,"docsLink":475,"showOnPricing":400,"tiers":476},"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":172,"hub":172,"fleet":172},{"id":478,"title":479,"showOnPricing":400,"tiers":480},"static-assets","Static Assets",{"edge":172,"hub":172,"fleet":172},{"id":482,"title":483,"description":484,"docsLink":485,"tiers":486},"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":172,"hub":172,"fleet":172},{"id":488,"title":489,"description":490,"docsLink":491,"tiers":492},"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":172,"hub":172,"fleet":172},{"id":494,"title":495,"description":496,"changelog":497,"subfeature":172,"showOnPricing":400,"tiers":500},"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.",[498],{"url":499,"release":463},"\u002Fchangelog\u002F2026\u002F07\u002Fteam-and-application-dashboards\u002F",{"edge":172,"hub":172,"fleet":172},{"id":502,"title":503,"description":504,"docsLink":505,"tiers":506},"blueprints-converge","Blueprints","Ready-made starting points for your apps, from cross-team Converge templates to OT and IT specific blueprints.","\u002Fdocs\u002Fuser\u002Fconcepts\u002F#blueprint",{"edge":172,"hub":172,"fleet":172},{"id":508,"title":509,"subfeature":172,"showOnPricing":400,"tiers":510},"blueprints-ot-apps","Blueprints - OT APPS",{"edge":172,"hub":400,"fleet":172},{"id":512,"title":513,"subfeature":172,"showOnPricing":400,"tiers":514},"blueprints-it-apps","Blueprints - IT APPS",{"edge":400,"hub":172,"fleet":400},{"id":516,"title":517,"description":518,"changelog":519,"showOnPricing":400,"tiers":523},"immersive-editor-snapshots","Snapshot Details in Immersive Editor","View and manage snapshot details directly inside the immersive editor without leaving your editing session.",[520],{"url":521,"release":522},"\u002Fchangelog\u002F2026\u002F03\u002Fsnapshot-detail-modal-immersive-editor\u002F","2.29",{"edge":172,"hub":172,"fleet":172},{"id":525,"title":526,"description":527,"changelog":528,"showOnPricing":400,"tiers":531},"immersive-editor-drawer","Customisable Immersive Editor Drawer","Pin, move, resize, or full-screen the immersive editor drawer. Your preferences are remembered between sessions.",[529],{"url":530,"release":410},"\u002Fchangelog\u002F2026\u002F04\u002Fimmersive-editor-drawer\u002F",{"edge":172,"hub":172,"fleet":172},{"id":533,"title":534,"description":535,"changelog":536,"showOnPricing":400,"tiers":539},"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.",[537],{"url":538,"release":522},"\u002Fchangelog\u002F2026\u002F03\u002Fembedded-editor-tab-title\u002F",{"edge":172,"hub":172,"fleet":172},{"id":541,"title":161,"features":542},"deploy",[543,549,558,564,570,576,582,588,593],{"id":544,"title":545,"description":546,"docsLink":547,"tiers":548},"hosted-instances","Cloud Instances","Run Node-RED instances managed and hosted by FlowFuse.","\u002Fdocs\u002Fuser\u002Fintroduction\u002F#creating-a-node-red-instance",{"edge":172,"hub":172,"fleet":172},{"id":550,"title":551,"description":552,"docsLink":553,"changelog":554,"tiers":557},"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",[555],{"url":556,"release":390},"\u002Fchangelog\u002F2026\u002F02\u002Fdevice-agent-nodejs-options\u002F",{"edge":172,"hub":400,"fleet":172},{"id":559,"title":560,"description":561,"docsLink":562,"tiers":563},"custom-hostnames","Custom Hostnames","Access your Node-RED application via your own domain name.","\u002Fdocs\u002Fuser\u002Fcustom-hostnames\u002F",{"edge":400,"hub":172,"fleet":400},{"id":565,"title":566,"description":567,"docsLink":568,"tiers":569},"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":172,"hub":400,"fleet":172},{"id":571,"title":572,"description":573,"docsLink":574,"showOnPricing":400,"tiers":575},"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":172,"hub":172,"fleet":172},{"id":577,"title":578,"description":579,"docsLink":580,"tiers":581},"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":172,"hub":172,"fleet":172},{"id":583,"title":584,"description":585,"docsLink":586,"tiers":587},"git-integration","Git Integration","Back up your flows to a remote Git repository through a DevOps Pipeline. 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