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#8253
Lakshmi Deepa S

JSON is a well-liked format for encoding/decoding data and sending it over the online and also for storing it. Python makes it easy to form JSON encode data strings and to decode it. JSON data sent to each MQTT topic must be 75 bytes or less. To use the MQTT node you would like to possess access to the broker. Using the broker address and the topic, you will configure the MQTT input node to subscribe thereon topic, causing it to get a replacement message whenever new data is published thereon topic. The message will contain information on the published data, including data in message payload and MQTT broker topic in message topic. First drag and drop an MQTT input node and configure the subject to something unique. You can use web sockets clients, MQTT dashboard, or your own library to send MQTT messages to brokers. Since you are sending the JSON string you have got to parse the message that the MQTT node generates when it receives the MQTT message. To do that you simply got to drag and drop the JSON node, and connect it to the MQTT’s node output. Node-red’s JSON node parses the incoming message and tries to convert it to JSON. If you send it a JSON string, it will convert it into a javascript object.