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Questions tagged [node-red]

Node-RED is a data-flow programming tool for wiring together hardware devices, APIs and online services in new and interesting ways.

Node-RED provides a browser-based flow editor to wire together flows using the wide range of nodes in the palette. A built-in library allows you to save useful functions, templates or flows for re-use.

The light-weight runtime is built on Node.js, and utilizes its event-driven, non-blocking model. This makes it ideal to run at the edge of the network on low-cost hardware such as the Raspberry Pi as well as in the cloud.

Problems that may require back and forth debugging may be better asked on the mailing list.

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2181 questions
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Is it possible to declare global variables in Node-RED and use them on the node configuration?

Supposing that I'm receiving information from many devices with the MQTT protocol and the following diagram is a simplified version of the block of one device: So let's also suppose that all other devices have exactly the same diagram, except for…
Rafael Muynarsk
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How to secure the access to my Node-RED UI with httpNodeAuth

I have searched everywhere but I can't seem to find a way to secure my Node-RED user interface. The UI can be accessed by anonymous users... So far I have tried to set up the settings.json file and the httpNodeAuth part but nothing worked. How can I…
komarek
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How can I remotely deploy a flow file in Node-RED?

Is there any way for deploying an existing Node-RED flow file myflow.json to a remote machine running Node-RED? After much googling, I stumbled upon this discussion in the relevant Google group, but it is not very enlightening. UPDATE (after the…
desertnaut
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Understanding a this._(STRING) call in node RED

I'm trying to understand existing code of the Switch node in node-red to deal with and make my own node correctly. I'm stuck with these lines : var operators = [ {v:"eq",t:"=="}, {v:"neq",t:"!="}, …
N Frb
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spawn in javascript : delayed stdout , how to disable buffer?

I'm trying to execute a program (binary), that is printing values regularly on the stdout. with exec, it works fine, but with spawn, results only comes after a while, why ? what can I do about that ? const…
OpenStove
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How to move a wire in Node-RED from one node to another?

Imagine I have wired a flow as follows: and now wish to rewire to: It seems that my option is to delete the existing wires and then re-wire them. My question is: Question Is it possible to move wires from one node to another as opposed to…
Kolban
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bluemix node-red debug not working

I'm working with a node-red application inside Bluemix. It worked well but now the debug sidebar did not show no message. The application log traces correctly the messages incoming from the IoT device. I tried to deploy again, to change browser,…
Francesca Gigante
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How to get output from NodeRed Mysql node

I want to get out put from NodeRed mysql node. Here image of connection : Select Query is : msg.topic = "SELECT * t.TableID FROM booking t where t.bookingdate='"+formattedDate+"' and t.TableID = 3"; Output i am trying to…
rwahid
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Nodejs seems to be not working; npm do work, however

I was running Node.js and Node-RED (depends on Node.js) normally one week ago. My system is Windows 8.1 64 bits. Nevertheless, today I am having a issue: As normally, I go to the node-red folder, and run node red.js. Then, surprisingly I got the…
pascoal
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HTTP POST in node-red js

I want to know how to do a http POST request with a JSON data into some server with API key. I searched in http://nodered.org/docs/ But they haven't written anything clearly. The documentation is very messy and not even good to understand. However,…
ninja.stop
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Multiple HTTP requests in Node-RED

I need to do HTTP request on each url in array in Node.red. Basically I want to filter URLs by their API response. How do I do this? I cannot find any "loop" nodes or anything.
Kuroki Kaze
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"Error: Node is either not clickable or not an HTMLElement" Puppeteer when i tried to get input by name

This is my HTML structure:

And this is the ways how i try to select the input: first way: const buttonTasas = await…
Jagcweb
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InfluxDB and NodeRED

It is quite a while since I coded something and it is the first time I am dealing with Influxdb and NodeRED. I am acquiring four sets of measurements from a sensor connected to a Pi. This is a screenshot taken during the debug, the measurements are…
FeliceM
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insert msg object to mongodb (node-red)?

We're experimenting with storing data to a MongoDB by using node-red. As it is now, we can store data on the database, but it seems like only the 'msg.payload' is stored (as document) - and not the whole msg object. Which confuses us a little...…
Buster3650
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How to create a custom Inject Node in NodeRED?

I want to start my node with a button click, so that I do not have to put the inject node in front. How would that be possible to register a button click in the javascript file? I have tried to put node.on("input", async function(msg){/*some…
user11057175
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