Catch express bodyParser error

Question

I want to catch the error from the bodyParser() middleware when I send a json object and it is invalid because I want to send a custom response instead of a generic 400 erro

Answer 1

I found checking for SyntaxError to be not enough, therefore I do:

if (err instanceof SyntaxError &&
  err.status >= 400 && err.status < 500 &&
  err.message.indexOf('JSON') !== -1) {
    // process filtered exception here
}