Convert.FromBase64String does not work in code but works in online tool

user_1136506 0
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I am writing a C# application to decode this string:

"--W3sic3RhcnRfdGltZSI6IjAiLCJwcm9kdWN0X2lkIjoiODQwMDMzMDQiLCJ1cmwiOiIifSx7InN0YXJ0X3RpbWUiOiI3OSIsInByb2R1Y3RfaWQiOiI4NDAzNjk2MSIsInVybCI6IiJ9LHsic3RhcnRfdGltZSI6IjgyIiwicHJvZHVjdF9pZCI6Ijg0MDAzMDIwIiwidXJsIjoiIn0seyJzdGFydF90aW1lIjoiMTA5IiwicHJvZHVjdF9pZCI6IiIsInVybCI6Imh0dHBzOi8vYmxvZy5sYXJlaW5lZHVzaG9wcGluZy5jYS8yMDE3LzAxL3RyYW5zZm9ybWVyLXNlcy12aWV1eC1nYW50cy1kZS1jdWlyLWVuLTUtbWludXRlcy8ifV0="

It works when I copy/paste it into this online tool: https://www.base64decode.org

But it throws an exception when I use Convert.FromBase64String(str):

System.FormatException: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters.

Why?

base64 c#
3 Answers

You'll have to remove the -- prefix from your string like was mentioned above. I want to add that I got the same error when I had data:image/jpeg;base64, prefix in my base64 string when using Convert.FromBase64String(str).

Removing data:image/jpeg;base64, from the string worked.

user_49351400
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