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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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How to get first key pair element of JSON object without knowing key and deleting it in node red

I am writing a function node in node-red that is taking in a JSON object with arbitrary key val pairs: { 30000c690b61: "m8Jp_M7Lc0", 30000c290bdc65: "S3qg3Rkl8Y", 30000c290bdf1c: "KsLpfVrR4W", 30000c290be5d0: "oXasuCWV_q", 30000c29e618:…
Sharon Soleman
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In node-red how can I send a message to the debug tab with out using debug node? Is there method I could call

I dont want use debug node. rather I want to just pass the debug message to the debug tab directly from my customized node. So I was wondering if may be there is a method that I could use to achieve this.
ramnath teja chekka
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Getting ssh-keygen in Alpine docker

for node-red new functionality Projects - where one can sync with a git repo, I need ssh-keygen in my Alpine docker Image. According to Alpine Linux packages for v3.6, it is in the openssh-keygen package. Thus, I added the RUN commands as follows in…
Jéan
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Running node-red-start after trying to create HTTPS "Error 140AB18F:SSL routines:SSL_CTX_use_certificate:ee key too small"

Hi everybody I have been setting up remote access to node-red for my raspberry Pi. I have amended the settings.js and installed node-red-admin but when I go to start node-red I get the following error: Error: error:140AB18F:SSL…
Simon Palmer
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How to scale Node-RED horizontally across a cluster of nodes?

Is it possible to scale out Node-RED horizontally on a cluster of nodes? Could not find any documentation on the same. My scenario is to handle millions of events per second and process them in real time using Node-RED.
Narendra Naidu
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4 answers

How to trigger Python script on Raspberry Pi from Node-Red

I'm using Node-Red, hosted on a Raspberry Pi for an IoT project. How do I trigger a Python script that is on the raspi from Node-Red? I want to run a script that updates the text on an Adafruit LCD shield which is sitting on the Pi Should I be…
pronoob
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How to properly test node-red nodes?

I'm developing a node-red node, and I'd like to know the best or intended way to test those nodes. I've been looking at some other nodes, and they look to depend on a peer installation of node-red itself and use the "helper.js" to load those nodes.…
Diego Pamio
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3 answers

Implementing two inputs in Node-RED

In my current project, we are trying to implement the current application functionality using Node-RED. The functionality is shown below. Here, Fire state receives two inputs: (1) TemperatureSensor (2) SmokeDetector. Both Sensors are publishing…
user-517752
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node-red - Node Credentials

Within a node-red flow I have a CassandraDatabase node with a user and pass. When I export the flow these credentials are not contained in the json, instead a flows_cred.json file appears with an encrypted string: {"$": "df28....... ... however if…
thechane
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'require' keyword doesn't work within Node Red Function node

first line in a Node red Function Node is var moment = require('moment-timezone'); ... I am trying to establish a timezone correct date/time stamp for sensor data. I get the following error when this node runs; ReferenceError: require is not defined…
DPGUITARMAN
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3 answers

How can I convert negative binary number to int?

I want to read Data via node red modbus node from a data source. The range is -20000 to 20000, but the node cannot handle negative numbers, so I had to convert them to binary numbers (DWORD), split them in the lower and higher word and convert these…
c0nr3f
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Recommended .gitignore for Node-RED

Is there a standard or recommended .gitignore file to use with Node-RED projects? Or are there files or folders that should be ignored? For example, should files like .config.json or flow_cred.json be ignored? At present I'm using the Node template…
Ayb4btu
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How to add an object to the Node-RED msg.payload

I need the Accel object as part of the payload object: msg.payload.Accel.x : 1 msg.payload.Accel.y : 2 msg.payload.Accel.z : 3 How can I add Accel and x,z,y to payload, ideally using the change node? I tried this already: msg.payload.Accel['x'] =…
jpsstack
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Combine two message payload

I'm using node-red on one of my projects. And I'm having trouble handling two message payloads in one node. I DO NOT want to deal with them SEPARATELY, instead I want this node to combine both inputs into ONE. All the answers I found online were…
WhoAmIWhereAmIWhatIAmDoing
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use an external js library in a node-red function

I've installed a js library https://www.npmjs.com/package/fft with npm, how can I make this available in node-red functions ?
OpenStove
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