Determine if string is in base64 using JavaScript

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Determine if string is in base64 using JavaScript

rated 0 times [ 168] [ 7] / answers: 1 / hits: 104756 / 13 Years ago, sat, october 22, 2011, 12:00:00

I'm using the window.atob('string') function to decode a string from base64 to a string. Now I wonder, is there any way to check that 'string' is actually valid base64? I would like to be notified if the string is not base64 so I can perform a different action.

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Answers

15

If valid means only has base64 chars in it then check against /[A-Za-z0-9+/=]/.

If valid means a legal base64-encoded string then you should check for the = at the end.

If valid means it's something reasonable after decoding then it requires domain knowledge.

[#89489] Thursday, October 20, 2011, 13 Years [reply] [flag answer]

answered 13 Years ago

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