catch all unhandled errors or bad responses

catch-all-middleware.js

const spirit = require("spirit").node

const catchall = (handler) => (request) => handler(request).then((resp) => {
  // something beforehand gave a bad response 
  // set our own custom message
  if (!spirit.is_response(resp)) { 
    return { status: 500, headers: {}, body: "generic error message because of bad response" }
  }
  return resp
  // something beforehand threw an error
  // set a custom catch all message
}).catch((err) => {
  return { status: 500, headers: {}, body: "generic error message because of thrown error" }
})

http.createServer(spirit.adapter(app, [catchall, other_middleware, ...]))