Practical, tool-linked guides on the formats and concepts behind the tools on this site — JSON and XML, JWTs, schema markup, PDFs, and SEO fundamentals.
Both formats move structured data between systems. Here's what actually differs, and which one fits your use case.
Invalid JSON almost always comes down to a handful of repeat offenders. Here's how to find and fix them.
A JWT is just a signed, encoded JSON object. Here is what that means in practice.
Structured data doesn't change your ranking directly — it changes what your result looks like once you're already ranking.
A merged PDF should be indistinguishable from its source files. Here's what actually causes quality loss, and how to avoid it.
There's no hard character limit, but there is a practical one, and going past it costs you control over your own headline.