error-lambda-integration.js

module.exports.hello = (event, context, callback) => {
  const errorResponse = {
    message: "Error! Dude You sent the wrong parameters"
  };

  // Use JSON.Stringify(), else Integration Response
  // cannot read your error message.
  // If not used, the Integration Response will read 
  // the response as [Object Object] which will make it
  // impossible to detect the status code. 
  callback(JSON.stringify(errorResponse));
};