hello, can anyone tell me why do i have NaN on my payload output ? [image] [image] thanks.

What is button1 sending in the payload?

nothing the button is just used as an inject node

The two change nodes will each send a separate message to the function node. The function node will only see one of those at a time, so it will only see either msg.payload1 or msg.payload2, not both at once. That means that either a or b will be undefined for each message. You can use a Join node…

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Concatenation of two numeric values

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zenofmud 16 June 2021 02:00 4

So without your flow I’m just asking questions so what are the change nodes setting the payload to? Are you sending strings by any chance?

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Concatenation of two numeric values

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