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JavaScript Node.js Basics 2017 Handling Errors in Node Handling Status Code Errors

Brian Patterson
Brian Patterson
19,588 Points

Getting "undefined" in the console.

I am following along with this video but with another API. The problem I am having is that I am getting undefined in the console if the season is not correct. Below is my code.

const http = require('http');

//const season = 1954;

function printMessage(races, season) {
  const message = `There are ${season} grandprix at the ${races} season.`;
  console.log(message);
}
//Print Error Messages
function printError(error) {
  console.error(error.messsage);
}

//printMessage(22,2017);
//Connecting to the API url (http://ergast.com/api/f1/2012.json)
function getSeason(season) {
  try {
    const request = http.get(
      `http://ergast.com/api/f1/${season}.json`,
      response => {
        if (response.statusCode === 200) {
          //console.dir(response.statusCode);
          let body = '';
          //Read the data
          response.on('data', data => {
            //Changing the buffer into a string.
            body += data;
          });
          response.on('end', () => {
            try {
              //Parse the data
              const seasonF1 = JSON.parse(body);
              // console.log(body);
              // console.log(typeof body);
              //console.dir(seasonF1);
              printMessage(season, seasonF1.MRData.RaceTable.Races.length);
              //Print the data
            } catch (error) {
              printError(error);
            }
          });
        } else {
          const message = `There was an error getting the profile for ${season} (${
            http.STATUS_CODES[response.statusCode]
          })`;
          const statusCodeError = new Error(message);
          printError(statusCodeError);
        }
      }
    );
    request.on('error', printError);
  } catch (error) {
    printError(error);
  }
}
//accept season as a command line argument
//const season = process.argv[2];
//get(season);
// get(1978);
// get(2001);
//console.log(process.argv);
// const seasons = [1978, 1984, 1999, 1950, 1954, 2002];
// seasons.forEach(getSeason);
const seasons = process.argv.slice(2);
seasons.forEach(getSeason);

Any help would be appreciated.

2 Answers

Joel Bardsley
Joel Bardsley
31,249 Points

Hi Brian, messsage needs to be corrected in the following:

//Print Error Messages
function printError(error) {
  console.error(error.messsage);
}
Brian Patterson
Brian Patterson
19,588 Points

Sorry, I don't understand. What needs to change?

Joel Bardsley
Joel Bardsley
31,249 Points

The typo - message is misspelled (3 x 's'), the error reporting will be looking for the error property of message, so this is why it'll be showing up as undefined.

Steven Parker
Steven Parker
231,236 Points

What do you mean by "if the season is not correct", and what behavior do you expect in such a case?

For any year I tried, I got a message giving me the number of grandprix in that season.

Brian Patterson
Brian Patterson
19,588 Points

What I mean is if I put "node seasonF1.js 1956not" in the console it gives me an "undefined" error message.

Steven Parker
Steven Parker
231,236 Points

I think it's what Joel discovered .. the "messsage" with 3 "s" characters. I didn't see it because I didn't have any errors.