URL Encoding (Percent-Encoding) Explained: encodeURIComponent, Spaces, and Double Encoding
URLs can only contain a limited set of characters. To include anything else, such as spaces, accented letters, or symbols with special meaning, they…
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The UTF-8 / Code Page Surprise That Corrupted My Log Parser
The UTF-8 / Code Page Surprise That Corrupted My Log Parser The parser wasn’t wrong. The bytes were fine. My shell lied about what “text” meant—and…
How to Decode a JWT Safely (Without Sending It to a Server)
A JSON Web Token (JWT) looks like an opaque blob, but it is just three Base64URL-encoded pieces joined by dots. Anyone who holds the token can read…
Base64 Is Not Encryption (And Other Common Misconceptions)
Base64 shows up everywhere: emails, data URLs, HTTP headers, JWTs. Because the output looks scrambled, it is often mistaken for encryption. It isn't…
Base64 Decode: Choosing the Right Method for Every Situation
A developer hits an unfamiliar string in a log file, an API response, or a query parameter and needs it readable before the day ends. The job looks…