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

Brian Patterson
Brian Patterson
19,588 Points

All my error messages say "undefined" in the console.

Now all my error messages say "undefined". Why is this happening?

const http = require('http');

//Print Error Messages
function printError(error) {
  console.error(error.messsage);
}

//const season = 1954;

function printMessage(races, season) {
  const message = `There are ${season} grandprix at the ${races} season.`;
  console.log(message);
}

//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 season 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);

I really don't understand why this is happening. I have pretty much followed the structure of the code and added a different API.

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,738 Points

I ran your code and uncommented the lines to call the functions, and it didn't throw any errors. How can I replicate the problem where it throws an error with no error message?

2 Answers

Steven Parker
Steven Parker
231,236 Points

You still have the same error that was pointed out in your previous question, where you have "messsage" (with 3 "s") instead of "message":

//Print Error Messages
function printError(error) {
  console.error(error.messsage);  // note: too many "s"
}