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app.use

Create middleware or add sub router with app.use.

app.use(middlewareOrRouters);
app.use(...middlewareOrRouters);
app.use(path_string, ...middlewareOrRouters);

Example 1​

app.use((rev, next) => {
  rev.foo = "bar";
  return next();
});
app.get("/hello", (rev) => {
  return rev.foo;
});

Example 2​

app.use("/hello", (rev, next) => {
  console.log("Logger for path /hello", rev.url);
  return next();
});
app.get("/hello", (rev) => {
  return "hello";
});