I've been doing this in several different projects, I finally decided to convert it to a proper lib.

The idea is to add an error return to HTTP handler functions, so you can avoid writing if err != nil { http.Error(w, err); return } everywhere.

The basic usage looks like:

mux.Handle("/", httperr.NewF(func(w http.ResponseWriter, r *http.Request) error {
  err := doSomething()
  return err
}))

This will yield a 500 and return a JSON like {"error":"doSomething error"}.

The lib also provide a Wrap function, so you can decide which status code you want:

mux.Handle("/e", httperr.NewF(func(w http.ResponseWriter, r *http.Request) error {
  err := doSomething()
  return httperr.Wrap(err, http.StatusBadRequest)
}))

Or, you can throw errors with a status, e.g.:

mux.Handle("/e", httperr.NewF(func(w http.ResponseWriter, r *http.Request) error {
  if something {
  	return httperr.Errorf(http.StatusBadRequest, "something: %v", something)
  }
  return nil
}))

So, this is it! You can also check the examples folder for a "real" usage.