I'm just learning this stuff as I go. I am parsing data returned by a HTTP GET input node and pub'ing each item's value to my mqtt server (thanks to bakman2) [image] MQTT Pub each JSON value General Hi, I'd like to publish several JSON object values from my weather statio…

I know the answer to your question but I’m pretty tired so excuses upfront if I write a bit incoherently. Beyond using node.send to send messages, you can use other functions on the same node object to log to the debug tab. See the logging part of this page of the docs. https://nodered.org/docs/us…

To amplify the words in the writing functions link you can, of course, add data to node.warn(), so you can insert lines in your function like node.warn(`item is: ${item}`)

What I expect is happening is my http get is returning a corrupted or incomplete JSON which is not structured the way my function is expecting. I'd like to output that corrupt JSON to the debug but only when there is an error. I've added a catch node -> debug output but I'm skeptical that it'll do a…

I'll play with some try..catch statements.

something like try { var foo = JSON.parse(msg.payload); // etc , etc // msg.payload = foo.after.some.processing return msg; } catch(e) { node.error("Error parsing: "+msg.payload , msg); }

That is a useful reminder that remote API's can and should never be considered reliable. So the first thing you should always do when using one is to make sure that you are trapping or ignoring any errors.

Function node error checking

General

m_elias 13 September 2019 21:34 7

I setup a catch node for the function in question and see that it includes the original msg object which kills my function. Looking at the data indicates that the API I'm connecting to thinks my API key is incorrect. This only sometimes happens a couple times a day so I think the remote API is just dropping the ball periodically and I'm going to ignore it for now.

Topic		Replies	Views
Can't use message element with Function node General function-node	4	128	26 December 2024
Undefined JSON message payload General	38	2762	12 February 2021
Error after deploying a project General	10	218	20 November 2023
Get Data to Var... but nothing work General	5	235	18 April 2023
Issue retrieving json from mqtt General	16	3431	7 March 2019

Function node error checking

Related topics