909: Handling and Throwing Errors

Syntax - Tasty Web Development Treats

Wes Bos

Js, Technology, Css, Html5, Tech News, Webdevelopment, News, Javascript, Html

4.9 • 1.1K Ratings

🗓️ 9 June 2025

⏱️ 39 minutes

🔗️ Recording | iTunes | RSS

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Summary

Scott and Wes break down how to properly throw, catch, and log errors in JavaScript and TypeScript. They cover client-side and server-side strategies, using tools like Sentry, and how to handle errors without taking down your whole app.

Show Notes

00:00 Welcome to Syntax!
01:19 Error terminology.
- 01:42 Thrown and catching.
03:01 What’s in an error.
- 04:09 Name and message.
- 04:42 Stack.
- 07:12 Node system errors.
- 07:34 Messages: strings, objects, or custom errors.
08:19 Throwing errors.
12:01 Promise errors.
- 12:10 Try catch block, .catch().
- 14:13 Using awaited-to.
- 15:10 Finally.
- 16:29 promise.try()
17:14 Re-throwing errors.
- Error Cause
18:12 Client-side errors.
- 18:15 Catching at different levels.
- 18:51 Displaying errors.
- 21:59 Transforming server errors into client errors.
- 24:12 Error boundaries.
25:26 Server errors.
- 26:10 JSON API.
- 27:41 HTTP response codes.
30:09 Logging and solving errors.
- 31:16 Proudly supported by Sentry.io.
  - Logging within Sentry
36:16 TypeScript and errors.

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Transcript

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0:00.0	Welcome to Syndax today. We have an episode for you on errors. How to handle them, how to throw them, what they contain.
0:09.0	Our application is full of errors. I write a lot of errors myself and how to structure your application so that you can handle them appropriately on the client, on the server, how to throw your own custom errors,
0:22.8	what to do with them when you should be throwing one versus returning some data just with some
0:27.6	errors in it is kind of a tricky thing. So we're going to dive on into it and I try to explain
0:34.8	all of those pieces. My name is Wes Boss, developer from Canada.
0:38.4	With me as always is Scott. How are you doing today, Scott?
0:41.9	I'm doing all right. A quick trip to the urgent care for a cut finger this morning.
0:46.8	But hey, man. Yeah. Not the first time, Wes. Not the first time. Yes. Oh my gosh. I know.
0:52.2	I don't know how many times Wes has gotten the message
0:54.6	that
0:55.4	Hey I'm going to be a little bit late
0:57.4	Got to head to the urgent care
0:58.7	Hurt myself in some way
1:00.1	So yeah
1:01.8	They glued me up
1:03.2	I'm good to go
1:05.0	And yeah
1:06.3	Feeling like
1:08.1	This is just my life
1:09.7	That's just how it goes I got to chill it goes. I got to chill out, I think.
1:19.6	All right. Well, let's get on into it. We're first going to dive into explaining a few
1:24.8	specific words about error and error handling. Then we'll get into what's in an
	...

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