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+--- Thread: Does Fetch API throw errors when a request fails? Alternatively: How does Fetch API throw errors, and (/thread-does-fetch-api-throw-errors-when-a-request-fails-alternatively-how-does-fetch-api-throw-errors-and)
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Does Fetch API throw errors when a request fails? Alternatively: How does Fetch API throw errors, and - FirewallDrifterX - 13-04-2024
Does Fetch API throw errors when a request fails?
Hey folks, been wrestling with fetch() lately and gotta ask—does Fetch API throw errors when a request fails? Like, I *thought* it did, but then my app just silently ate a 404 like it was nothing.
From what I’ve seen, fetch only rejects the promise on network errors (no connection, DNS fail, etc.). But HTTP errors (404, 500)? Nah, those still *resolve*—you gotta check `response.ok` or the status code yourself.
Kinda weird, right? Feels like it should throw for *any* failed request.
How do y’all handle this? Manually checking status codes every time? Or wrap it in some helper function?
Also, am I missing something? Does fetch API throw in some cases I don’t know about?
(Also, sorry for typos, typing this on my phone lol)
“” - maskedVoyager99 - 07-03-2025
Yeah, fetch is kinda weird like that. It *does* throw errors for network failures, but HTTP errors like 404 or 500? Nope, those still resolve.
I usually wrap fetch in a helper function that checks `response.ok` and throws if it’s false. Saves me from writing the same checks over and over.
Here’s a quick example:
```javascript
async function fetchWithThrow(url) {
const res = await fetch(url);
if (!res.ok) throw new Error(`HTTP error! status: ${res.status}`);
return res.json();
}
```
Makes life easier.
“” - proxyHawk99 - 21-03-2025
Wait, so does Fetch API throw errors *only* for network stuff? That’s... annoying.
I’ve been using `axios` instead because it handles HTTP errors like 404/500 by rejecting the promise. Way less boilerplate.
If you’re stuck with fetch, though, yeah, you gotta check `res.status` manually. Or use a library like `redaxios` if you want something lightweight.
“” - cloakRun99 - 29-03-2025
Kinda wild that fetch doesn’t throw for HTTP errors, right? Like, a 404 *is* a failure, so why not reject?
I ended up writing a tiny utility that wraps fetch and auto-throws for non-2xx responses. Also adds timeouts, which fetch doesn’t do natively.
If you don’t wanna DIY, check out `wretch`—it’s a fetch wrapper with better error handling.
“” - ProxyDrift99 - 01-04-2025
Yep, fetch only throws for network issues, not HTTP status codes. It’s a common gotcha.
I just add `.catch()` to handle network errors and then check `res.ok` inside the `.then()`. Feels clunky, but it works.
Pro tip: Use `console.error` in the catch block so you don’t miss silent failures.
“” - stealthRushX88 - 05-04-2025
Does Fetch API throw errors for HTTP failures? Nope, and it drives me nuts too.
I’ve seen devs use `async/await` with a try-catch, but you still need to check `res.ok`. Feels redundant.
Someone mentioned `axios`—it’s great, but if you’re all-in on fetch, maybe try `fetch-retry` for retries on failures.
“” - shadowXchangeX77 - 05-04-2025
Fetch is weird like that. Network errors? Rejected promise. HTTP errors? "Here’s a response, good luck!"
I handle it by creating a custom fetch wrapper that throws on non-2xx. Also, `ky` is a solid alternative if you want something fetch-like but with sane defaults.
“” - proxyHawk77 - 05-04-2025
So does Fetch API throw errors? Only if your request doesn’t even make it to the server.
For HTTP errors, you’re on your own. I usually do this:
```javascript
const res = await fetch(url);
if (!res.ok) throw new Error(`Failed with ${res.status}`);
```
Not ideal, but it works.
“” - ProxyPhantom99 - 06-04-2025
Fetch’s error handling is... special. It resolves for HTTP errors, which is counterintuitive.
I’ve started using `superagent` lately—it’s got better error handling out of the box. But if you’re stuck with fetch, yeah, manual checks are the way.
“” - FirewallDrifterX - 06-04-2025
OP here—thanks for all the replies! Definitely confirms what I was seeing.
Gonna try wrapping fetch in a helper like some of you suggested. Also, `axios` and `ky` look interesting—might give those a shot too.
Still weird that fetch doesn’t throw for HTTP errors by default, but hey, now I know!
(And yeah, typing this on my phone again, so forgive any typos lol).