Hi I am reading accelerometer data from chip and sending it to the server and my node red is subscribed to the topic that reads the accelerometer data. In Node Red, I am using function node with the following code: var NewBuffer = Buffer.from(msg.payload, 'base64'); var decoded_msg = NewBuffer.t…

Are they there in the buffer coming in? If not which conversion is adding them? Why are you specifying msg.payload.length in the substr call?

Hi Colin Thanks for your reply. Initially, I am receiving base64 encoded data. Then I have applied above function to decode the base64 to ASCII. This is the only function that I am using in my Node Red that has input from the server that it is subscribed to and output of a debug node. I figured o…

I meant you to check whether the extra characters are on the end of the base64 data. And if not whether they are on the end of the Buffer after conversion to a Buffer. You can do this by checking the length I suppose. You can send diagnostic data to the debug window using node.warn() so for exam…

Yes, The extra characters are getting added after the buffer conversion to ASCII. Initial string does not have those characters. I checked the string length of both using the node.warn function. [Node%20Red]

Extra Characters after base64 Decoding

General

Manjot 19 August 2019 17:35 6

Hi Colin,

The issue has been resolved.
I was using msg.payload for decoding but instead I only required the message data not the whole message object. So I replaced Buffer.from(msg.payload, 'base64') in my code to Buffer.from(JSON.parse(msg.payload).data, 'base64').
It is working now without giving any random data.

Thank you for your help.

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Extra Characters after base64 Decoding

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