Express.js offers a wide range of middlewares that replace built-in functions. One example is body-parser, which parses HTTP request bodies, replacing the built-in function express.bodyParser.
body-parser replaces the built-in function express.bodyParser to parse HTTP request body.
What exactly does it mean when they say "replaces built-in function"? Are these replacements actually better than the original built-in versions? I don't see the point of adding extra modules if they don't offer any improvements. This question arises because the middleware documentation doesn't explicitly mention this detail.