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developer
20263 articles
UUIDs Explained: Versions 4 and 7 and When to Use Them
What a UUID is, how version 4 and version 7 are built, why collisions are not a worry in practice, and why a UUID must not be used as a secret.
URL Encoding Explained: What %20 and %3D Mean
Why URLs need percent-encoding, which characters are safe, how encodeURI and encodeURIComponent differ, and how to fix the most common double-encoding and plus-sign mistakes.
What Is Base64? How to Encode and Decode It
What Base64 is for, how 3 bytes become 4 characters, why the text grows by a third, the URL-safe form and the common mistakes, including thinking it is encryption.