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 Reject a Promise and Handle Errors

Bernardo Hauer Santos
Bernardo Hauer Santos
8,767 Points
Posted by Bernardo Hauer Santos
Bernardo Hauer Santos
8,767 Points

Why use catch() rather than passing a second function to then()?

Is there a technical reason as to why we use catch rather than just passing a second function to then()?

Or is this simply done to make the code more readable?

1 Answer

Justin White
Justin White
8,765 Points
Justin White
Justin White
8,765 Points

catch is used to catch errors. if for some reason fetch has an error, or one of the functions in the .then() has an error. Catch will be called and do whatever you tell it to do when there is an error.