express rescue

a.js

const rescue = require('express-rescue')

class UserNotFound extends Error {}

// ...

app.get('/users/:id', [
  rescue(async (req, res) => {
    throw new UserNotFound(/* ... */)
  },
  resuce.from(UserNotFound, (err, req, res) => {
    res.status(404)
       .json({ message: 'user not found' })
  })
])

b.js

const rescue = require('express-rescue')

class UserNotFound extends Error {}

class HttpError extends Error{
  constructor({ status, message }) { /* ... */ }
}

class NotFound extends HttpError {
  constructor(message) { super({ status: 404, message }) }
}

// ...

app.get('/users/:id', [
  rescue(async (req, res) => {
    throw new UserNotFound(/* ... */)
  },
  resuce.from(UserNotFound, (err, req, res) => {
    throw new NotFound('user not found')
  })
])

app.use(rescue.from(HttpError, (err, req, res) => {
  res.status(err.status)
     .json({ message: err.message })
}))