Humans only.
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How ACME HTTP-01 and DNS-01 Challenges Work Internally
Automated TLS certificate issuance looks simple from the outside. An ACME client requests a certificate, a certificate authority creates a challenge, the client proves control of the requested domain, and the CA issues the certificate. Once the process has been automated, certificate renewal ca...
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 what's inside; no secret key is needed. That is by design: JWTs are meant to be signed, not hidden.
What a Cron Expression Actually Means (With Examples)
Cron is the classic Unix job scheduler, and its schedule syntax has spread far beyond it: CI pipelines, cloud schedulers, and job queues all accept cron expressions. The syntax is compact, which makes it easy to get subtly wrong. Here is how to read and write it with confidence.
Why You Should Remove EXIF Data Before Sharing Photos
Every photo from a phone or camera carries a block of hidden information called EXIF (Exchangeable Image File Format) metadata. It is useful for photographers and for organizing libraries, but it can reveal far more than you intend when you share an image publicly or send it to a stranger. What...
JSON vs YAML: When to Use Which
JSON and YAML can describe the same data, so the choice comes down to who (or what) reads and writes the file. JSON is strict, small, and easy for software to parse. YAML is looser and friendlier for humans to edit.
How to Fix "Unexpected Token" and Other Invalid JSON Errors
Errors such as "Unexpected token } in JSON at position 42" or "Expected property name or '}'" almost always come from a small syntax slip. JSON is stricter than JavaScript object syntax, and it is easy to write something that looks fine but is not valid. These are the mistakes behind the vast m...