async-router.js

// catch any errors in the promise and either forward them to next(err) or ignore them
const catchErrors = fn => (req, res, next) => fn(req, res, next).catch(next)
const ignoreErrors = fn => (req, res, next) => fn(req, res, next).catch(() => next())

// wrap my routes in those helpers functions to get error handling
app.get('/sendMoney/:amount', catchErrors(sendMoney))

// use our ignoreErrors helper to ignore any errors in the logging middleware
app.get('/doSomethingElse', ignoreErrors(logSomething), doSomethingElse)

// controller method can throw errors knowing router will pick it up
export async function sendMoney(req, res, next) {
  if (!req.param.amount) {
     throw new Error('You need to provide an amount!')  
  }
  await Money.sendPayment(amount) // no try/catch needed
  res.send(`You just sent ${amount}`)
}

// basic async logging middleware
export async function logSomething(req, res, next) {
    // ...
    throw new Error('Something went wrong with your logging')
    // ...
}

What's the difference between:

.catch(next)

and

.catch(() => next()) ?

@johnib .catch(next) passes all parameters to the next function. It's actually just a shorthand for .catch((...args) => next(...args))

catch(next) is actually like catch(error => next(error))