What is the name of the direction in programming that deals with algorithms for parsing / parsing JSON, XML, and other languages?

Question

Programming

Of course, I'm not talking about cases where they take a ready-made library like Json.NET and parse something there.
And not about those cases when you need to parse something within a specific task, and it is stupidly parsed with a regular expression or through IndexOf / Substring.
I'm talking about those cases when they write a parsing algorithm that fully supports a certain language. Like the same Json.NET. Or let's say for an interpreter, compiler or IDE. Or for the browser engine.

Answer 1

I advise you to read the source code https://github.com/deadalnix/SDC at your leisure. Very simple and everything is there.
You can also look at this thing www.volt-lang.org/doc/volt.html#lexical

Answer 2

Lexical analysis -> syntactic analysis -> semantic analysis.
Theory of parsing, translation and compilation.
Alfred Aho and Jeffrey Ullman.