Uploaded April 2018 | Updated September 2026, 3 weeks ago

---

One of the the most common use scenarios for using JSON data is for combining data from multiple sources.
In this tutorial we will simulate a multi-sensor environment were we collect data from several sensors and publish it wusing MQTT on a single topic using JSON encoded Data.
The video also demonstrates how we can hold and delay publishing data while we combine it.
To accomplish this we use a fuction node and use the context object to store sensor values before we publish them.

Related Tutorials and Resources
Flow used in video
stevesnoderedguide.com/download/working-with-json-data-in-node-red
-
stevesnoderedguide.com/working-with-json-data-node-red
-----------------------
Introduction to JSON
w3schools.com/js/js_json_intro.asp
------------------
Working With JSON Data in Node Red
youtu.be/24ZY3CEsiow
----------
Creating a Simple Controllable MQTT Sensor With Node-Red
youtu.be/ds-AssFu99Q
---------
The Node-Red Message Object for Beginners
youtu.be/y05vQUIMIxs
------------
Create a Node Red Basic Flow - MQTT Subscribe Example
youtu.be/eZUSQ1y6kSM
---------------------------------
How to Create a Node-Red MQTT Dashboard
youtu.be/Gu0Vq2kVNzw
---------------------------
How to Store Data In Node Red Variables
youtu.be/kNfP1vw2Img
-----------------------
Receive JSON Data Over MQTT with Node-Red

youtu.be/jeSg4bM8Kf0
Have a question Use the comments or if you want help then use
steves-internet-guide.com/ask-steve
If you find these videos useful then you might want to consider buying me a coffee
paypal.me/StepenCope