Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Asynchronous Programming with JavaScript Understanding Promises Handle Multiple Promises with Promise.all

Program breaks when on of the promises are rejected. (Namespelling discrepancy issue.)

Since Wikipedia spells Anatoly's name with an I at the end, I get a 404 error on that specific promise. This gives me the following error:

Error at XMLHttpRequest.xhr.onload (promises.js:15)

How do I make sure that the program works, even if this happens?

4 Answers

Brendan Moran
Brendan Moran
14,052 Points

Use Promise.allSettled(). The following code works, it's simply going to skip over the rejected promise:

function getWikiProfiles(data) {
  const profiles = data.people.map(person => {
    return getJSON(wikiUrl + person.name);
  return Promise.allSettled(profiles);

function generateHTML(data) {
  data.forEach(person => {
    if (person.status === 'fulfilled') {
      person = person.value;
      const section = document.createElement('section');
      section.innerHTML = `
        <img src=${person.thumbnail.source}>

where exactly is getWikiProfiles being called?

I had the same problem but your code helped thanks alot

Steven Parker
Steven Parker
229,921 Points

This issue is due to two 3rd-party API's having a disagreement about spelling. :see_no_evil: Code that would handle this kind of thing in a generic way would be rather complex.

But if you don't mind applying a temporary fix for these specific cases, see the code posted by another student in reponse to this other question

Great solution. Tnx