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Created November 14, 2019 17:58
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Decoding Base64-URL without padding
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b64url-np.md

Decoding Base64-URL without padding

1) Add padding

Divide the length of the input string by 4, take the remainder. If it is 2, add two = characters at the end. If it is 3, add one = character at the end.

You now have Base64-URL with padding.

2) Translate to Base64

Replace all - characters by + and all _ characters by /.

You now have Base64 with padding.

3) Decode Base64

Base64 decoding should be available as a library for your favorite language...

Examples

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