YAML and JSON are both data serialization formats, but they serve different purposes and have very different syntaxes. Choosing the wrong one can make your config files harder to maintain, your APIs harder to integrate, and your tooling chain more fragile. Here is what you actually need to know. The Core Difference JSON (JavaScript Object Notation) was designed for data exchange. It is strict, unambiguous, and machine-readable first. Every string needs quotes. Every key needs quotes. There are no comments. There is no ambiguity about what a value is. YAML (YAML Ain't Markup Language) was designed for human-readable configuration. It uses indentation instead of braces. Keys do not need quotes for simple strings. Comments are supported. And it can be extremely expressive — almost too expressive.…