Create image from Base64

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Posted on 3 Oct 2022 15:10:40 by DuncanIVH

I'm trying to create an image in Sharepoint based on the Base64 encoded data which I have received in JSON format.

This Base64 comes in as:

data&colon;image/png;base64,iVBORw0KGgoAAAANSUh...

If I use DecodeBase64ToBinary on this, I get the error

The template language function 'base64ToBinary' was invoked with a parameter that is not valid. The value cannot be decoded from base64 representation.'.

However, if I remove

data&colon;image/png;base64,

from the start of the data, it works fine.

I thought this was needed as part of the Base64 data? It would be a pain if I have to remove it in order to decode it.

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Answers (1)

ctrl_kudorje 143 on 17 Apr 2025 at 18:21:14

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Create image from Base64

what about if the data is in PDF and starts like this?
JVBERi0xLjMKJcfsj6IKNSAwIG9iago8PC9MZW5ndGggNiA
DuncanIVH 86 on 04 Oct 2022 at 08:48:05

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Re: Create image from Base64

Thanks @v-xiaochen-msft
I could have sworn I'd tried that already, but that fixed it!
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v-xiaochen-msft on 04 Oct 2022 at 02:41:20

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Re: Create image from Base64

HI @DuncanIVH ,

Please use datauritobinary instead of base64tobinlary if the string has a head like 'data:....'

Best Regards,

Wearsky