How to Successfully Decode Base64 Image Data in Go?

Decoding Base64 Image Data in Go

You have a Base64 encoded image data URL that you need to decode to check its dimensions. However, you encounter an error stating "Unknown image format" while attempting to decode the image configuration.

To resolve this issue, ensure that the image format handlers are registered prior to calling image.DecodeConfig(). Import the necessary image format package, such as:

import _ "image/png"

If you know the exact image format, you can use the corresponding DecodeConfig() function directly, e.g. png.DecodeConfig().

Additionally, instead of replacing the non-Base64 prefix from the data URL, slice the string as follows:

input := "data:image/png;base64,iVkhdfjdAjdfirtn="
b64data := input[strings.IndexByte(input, ',')+1:]

This efficiently creates a new string header without copying the string in memory. By ensuring proper image format registration and using the correct data extraction method, you can successfully decode the image and retrieve its dimensions.

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