Have a look at this: https://tomassetti.me/parsing-in-javascript/#chevrotain https://tomassetti.me/parsing-in-javascript/#chevrotain This is Not exactly a pars

Have a look at this: https://tomassetti.me/parsing-in-javascript/#chevrotain https://tomassetti.me/parsing-in-javascript/#chevrotain This is Not exactly a parser generator but an internal JavaScript DSL for writing parsers, but it does meet the criteria for a more verbose syntax.