Option to disable error overlay

[acifani]

Feature request

Is your feature request related to a problem? Please describe.

Hey, the new error overlay is great and I am very thankful of you guys for adding such a feature.
The problem: it's not that great when running automated tests (with something like Cypress). Any unhandled error/promise will cause the overlay to pop up (it was not the case with the previous react error overlay), causing the test to fail - even when the error originates from some third party code that we cannot handle ourselves

Describe the solution you'd like

Either a flag to disable the overlay altogether or a global hook to handle the exception ourselves and decide if it's worth throwing or not, like Cypress does

Describe alternatives you've considered

We have opted to run the tests in prod mode for now, but that's something we'd prefer not to do, because of the development mode goodies that we can use for debugging.

Additional context

In our case, the error being thrown is a fetch error from a third party library to a domain we block in our test config

[timneutkens]

Running tests against a development mode server is really uncommon and will allow you to ship bugs to production 🤔

[esperancaJS]

In TDD it's common

[gtarsia]

@timneutkens I don't think this was a very good first reply at all, @acifani request being invalidated because you argue he is doing a bad practice (which is itself very debatable) is very wrong, there may be a dozen other reasons why someone wouldn't want a modal blocking their entire page because an error happened. Developers are grown ups and should handle errors in dev whatever way they want (granted this overlay is shown by default for the better out of the box experience).

I don't see how this request is outrageous, I would imagine it being very simple to implement like adding an environment var where if defined doesn't render the overlay.
Let users control their dev experience, maybe just show the error in the terminal.

It's been 2 years with no implementation yet, and I imagine a lot of projects used some hacky workarounds to make this work, resulting in bad nextjs projects.

[acifani]

@timneutkens totally agree, we have multiple test steps before shipping to production: this will ideally run on pushes/PRs, then we have another one for our staging environment which will run as close to production as possible.

As integration/e2e tests are both hard to write and slow to fix, we prefer fast iteration locally while making sure to run every test in staging before shipping to production

[timneutkens]

@timneutkens totally agree, we have multiple test steps before shipping to production: this will ideally run on pushes/PRs, then we have another one for our staging environment which will run as close to production as possible.

As integration/e2e tests are both hard to write and slow to fix, we prefer fast iteration locally while making sure to run every test in staging before shipping to production

But even then the error overlay is shown when errors happen that would crash at runtime 🤔 So you'd fix them, if you're seeing the error overlay in other cases that'd be unexpected

[acifani]

@timneutkens actually, that's not always the case for us 😄 we also get the overlay for blocked networks calls (Failed to fetch) and I believe for errors that wouldn't affect the main application as well (think 3rd parties, but I'll have to double check that)

These were errors that did not show up on the old overlay and are not part of the "proper" react application code

[justincy]

I also see the error overlay for failed network requests.

[timneutkens]

I also see the error overlay for failed network requests.

Because they're uncaught errors in your code, which is expected to show the overlay.

[pixelpax]

They're not uncaught though. They should be caught by the error boundary.

[acifani]

I also see the error overlay for failed network requests.

Because they're uncaught errors in your code, which is expected to show the overlay.

Agree, but that's why we might need an escape hatch or a way to control when to show the overlay. Sometimes, you're not in control of the code that is failing and you can't handle those errors at all

[filipesmedeiros]

Although I agree that having this option would never be bad (more config is rarely bad, especially if it doesn't get in the way), I do agree that the error popping up should first be solved inside your code. I'm not saying that you haven't tried or anything, just that I think it's probably very rare for an uncaught exception to be uncatchable. You can always wrap it, right? Or for example I've had to dynamic import stuff that broke at import time, etc

[zer0blockchain]

Were you able to find a way to exclude certain exceptions? We use a library that is notorious for throwing exceptions but continues to work as intended. They are one of the only libraries and we can not just move away from it. It would be ideal to be able to handle these as an exclusion (they happen async/in a Promise).

[codeviking]

I ran into this on a project I'm working on. In our case we had logic like so (it's worth noting that we had this in a lot of different files, and sometimes we were throwing 404s and other-times 400s):

SomePage.getInitialProps = () => {
   try {
        const resp = await axios.get("/api/some-stuff");
        return resp.data;
    } catch (err) {
        if (err.resp && err.resp.statusCode == 404) {
            return Promise.reject(new NotFoundError());
        }
        // Fallback to a 500
        return Promise.reject(err);
     }
}

We wrote our own _error.tsx component as to have a branded error page, as NextJS's documentation suggests. That said when working locally we couldn't actually verify how the error page looked, and instead had to request it directly by hitting /_error in a browser.

This worked, but it forced us to add query string arguments to the /_error handler so that the developer could override the status code (to verify that both the display and error handling logic were working correctly):

ErrorPage.getInitialProps = (ctx: NextPageContext) => {
    // Usually we take the status code associated with the error that brought the user here.
    // We fallback to a 500 if we don't have one.
    let statusCode = ctx.err && ctx.err.statusCode ? ctx.err.statusCode : 500;

    // To make it easy to work on this page we let the user provide a status code via the query
    // string.
    const isNotProd = process.env.NODE_ENV !== 'production';
    if (isNotProd && ctx.query.status) {
        statusCode = parseInt(
            Array.isArray(ctx.query.status) ? ctx.query.status[0] : ctx.query.status
        );
    }

    if (ctx.res) {
        ctx.res.statusCode = statusCode;
        ctx.res.setHeader('Cache-Control', 'no-cache, no-store');
    }
    return { statusCode };
};

I realize this is a little different than the use-case mentioned in this discussion, as we weren't specifically looking to run integration tests. That said it's similar enough it felt worth mentioning here.

Rather than adding "yet another option" (YAO 😅 ), what if using a custom ErrorPage caused the overlay to
be disabled. The overlay could be distributed as a component, so that someone could still use it when working locally fi they wanted to:

// _error.tsx
import { ErrorOverlay } from 'next/error';

export default function ErrorPage({ statusCode, err }: ErrorProps) {
  if (process.env.NODE_ENV !== "production" && statusCode === 500) {
     return <ErrorOverlay {...err} />
  }
  return <MyCustomError status={statusCode} err={err} />
}

This seems like a nice balance. If someone opts out by implementing a custom error page they'll probably find the ability to easily test the behavior more valuable than the affordances provided by the error overlay.

[fabiosantoscode]

My team has also encountered this issue.

We wrapped API code which might fail in a function much like

await mightFail(() => {
  callAPI()
  successMessage()
})

This function would provide to the user an error message in a toast component.

However, for flow control reasons, it's convenient for us that this function re-throws exceptions, in situations such as this:

await callFunctionWhichCallsMightFail()

onFinish()  // don't want to call this if the above throws!

So we're left in a situation where we want to rethrow. But not too much, because this overlay would annoy us during development.

I hope this is reconsidered.

In the meantime, I created a hacky workaround for this issue, as follows:

// in pages/_app.js

const noOverlayWorkaroundScript = `
  window.addEventListener('error', event => {
    event.stopImmediatePropagation()
  })

  window.addEventListener('unhandledrejection', event => {
    event.stopImmediatePropagation()
  })
`

// in a <Head> component:

{process.env.NODE_ENV !== 'production' && <script dangerouslySetInnerHTML={{ __html: noOverlayWorkaroundScript }} />}

This is added in a script tag in the <head> because anything else I've tried is after nextJS has subscribed to the error event.

In our case, I've added conditions that check if the error went through our error notification functionality. Errors which didn't get shown as a toast, do show the overlay.

[SilasReinagel]

This is amazing! Thank you!

[NicoAtScopely]

This is working perfectly as of today. Thanks for the @fabiosantoscode

[SrBrahma]

Is there a way to get the error content from that event?

[shuaibird]

AWESOME. Life Saver.

[imran-yasin]

That's amazing it works. Thank you

[adesnmi]

For those doing the same search as I am, implementing something identical to https://github.com/mui-org/material-ui/blob/master/examples/nextjs/pages/_document.js fixed this issue for me.

My _document.js didn't require all the modifications the document did, and looked like:

import { Children } from "react"
import Document from "next/document"
import { ServerStyleSheets } from "@material-ui/core/styles"

export default class AppDocument extends Document {}

AppDocument.getInitialProps = async (ctx) => {
  // Render app and page and get the context of the page with collected side effects.
  const sheets = new ServerStyleSheets()
  const originalRenderPage = ctx.renderPage

  ctx.renderPage = () =>
    originalRenderPage({
      enhanceApp: (App) => (props) => sheets.collect(<App {...props} />),
    })

  const initialProps = await Document.getInitialProps(ctx)

  return {
    ...initialProps,
    // Styles fragment is rendered after the app and page rendering finish.
    styles: [
      ...Children.toArray(initialProps.styles),
      sheets.getStyleElement(),
    ],
  }
}

I didn't need any .babelrc modifications, etc., just that file.

[jimisaacs]

Should an error boundary prevent this popup from displaying? Because it isn't, and I thought an error boundary would be considered "caught".

[pm0u]

did you figure anything out here? I've tried error boundaries in components as well as directly at the _app level and none of them seem to prevent the popup?

[dkstrong]

The error boundary only captures errors that happen in the render function of a component. The error popup happens from any uncaught error- not just errors from rendering.

This workaround worked for me to prevent nextjs from getting the uncaught error event: #13387 (comment)

[corysimmons]

@timneutkens If it's an easy adjustment, would it be possible to add an env var like NEXTJS_DISABLE_ERROR_OVERLAY?

Specifically it'd help with my use-case of trying to style some error pages/components where I'm intentionally throwing so I can see the error and design against it. It's frustrating having to close the NextJS/React overlay on every save. 🙃

[gaurav5430]

We have a tracking api call which fails in development, but works alright in production. We are fine with it failing in development because it does not impact any functionality. On production we already use a crash reporting tool which will tell us if the api fails.

The error overlay keeps popping up on development mode. I do not want to have any special handling / check for development vs production in my codebase while trying to make this api call, and it would not make sense to handle this error as well, because I want the api to fail in production and get captured by the crash reporting setup.

It is slightly annoying that we have to close it explicitly even though we want to ignore the errors.
An option to disable it would be great

[justusip]

You can add this to the .css file.

nextjs-portal {
  display: none;
}

[fgarrec0397]

This one worked well since @fabiosantoscode solution did not work for me because the api call comes from a hook that I don't have control of it.

The only thing I did more is to add an environment variable to activate it or not and add a class on the body if it is true.

<html lang="en">
    <body
        className={
            process.env.HIDE_NEXT_ERROR_OVERLAY === "true"
                ? "hide-nextjs-portal"
                : undefined
        }
    >
        {children}
    </body>
</html>

[BenjaminCCG]

but when i add this css,the page can not scroll,what should i do

[juanlatorre]

it's not a complete solution, Next.js is also adding "overflow: hidden" to the body tag sometimes

[bertho-zero]

The simplest would be an option directly understood by next to either show it by default, hide it, or minimize it. The request does not seem superfluous

[CaiqueCoelho]

This could maybe help for Cypress tests https://glebbahmutov.com/blog/close-popup/

[geomaster]

One point I haven't seen mentioned is that the error overlay makes it much harder to drop into the debugger to debug the issue. The only way is to check "Pause on caught exceptions", which then causes the debugger to break on a lot of exceptions caught by third-party libraries (e.g. feature detection).

The debugger should be the primary UI when an uncaught exception occurs - it shows the stack trace and exception context much better than the error overlay can, and allows inspection of state. The overlay may be fine for simple errors, but it offers an inferior experience for everything else.

For this reason e.g. physically hiding the overlay via CSS doesn't work - the exception is still caught by Next.

Please add an option to disable the error overlay completely, or at least an option to rethrow the error that was caught.

[FezVrasta]

If not for all the reasons mentioned above, something should be done in order to make Suspense usable. Right now any error thrown by a suspensable component will show the overlay, even though the intended way to handle errors like those is to use an error boundary.

[kostia1st]

My bet is this issue's gonna be kept ignored, then forgotten, and never taken action upon. Tough reality.

[georgiosd]

Clearly. It doesnt seem to make it high on their product board.

…

On Thu, 14 Sep 2023 at 10:49, Kostiantyn Ko ***@***.***> wrote: My bet is this issue's gonna be kept ignored, then forgotten, and never taken action upon. Tough reality. — Reply to this email directly, view it on GitHub <#13387 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAMYG5T22LNAJIR5XUDPZ5TX2KZHFANCNFSM4SOELWPQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[B-Mitchell]

If you're importing a component and it has dynamic content, you could import it this way to avoid hydration and hence the error overlay.

import dynamic from 'next/dynamic'
 
const NoSSR = dynamic(() => import('../components/no-ssr'), { ssr: false })
 
export default function Page() {
  return (
    <div>
      <NoSSR />
    </div>
  )
}

[netgfx]

I tried with

.nextjs-toast-errors-parent {
  display: none;
}

and it worked fine

[B-Mitchell]

when you're hosting with vercel would the build fail cause of the error ? cause you're mostly using css to hide the error, but it's still there.

[netgfx]

Well no, but the issue is not to fix the error but just don't show it for say a presentation. There are some really 'special' hydration errors that don't affect anything

[B-Mitchell]

okay okay, I get it now.
thank you.

[cognivator]

My css import based on the class name, above, couldn't get through the shadowDom boundary. But adding this tag name style to a top-level .css file in app/layout.tsx fixed it:

nextjs-portal {
   display: none;
}

I put this is it's own file (e.g. nextjsPortal.css) and import it in the layout.tsx. If I want to see the errors, I comment the import.

[sesm]

My preferred solution: keep the error box, but make it minimized by default to not interrupt the workflow.
The line we want to fix to achieve this is:

next.js/packages/react-dev-overlay/src/internal/container/Errors.tsx

Line 186 in ffdfd33

setDisplayState('fullscreen')

Next makes patching this difficult by having it in a separate package that is compiled from TS.
But you still can patch it, the steps would be:

1. Install patch-package (for example, yarn add -D patch-package)
2. Open <PROJECT_ROOT>/node_modules/next/dist/compiled/@next/react-dev-overlay/dist/client.js
3. Find text useState('fullscreen') and replace it with useState('minimized'), there should be only one occurrence in this file.
4. npx patch-package next.
5. Add npx patch-package to your postinstall.
6. Congratulations, you have the patch now! You will probably have to repeat the procedure after upgrading Next.js, because the compiled TS output will likely to change dramatically.

If you have Next.js version 14.0.1 like I do, here is the patch:

diff --git a/node_modules/next/dist/compiled/@next/react-dev-overlay/dist/client.js b/node_modules/next/dist/compiled/@next/react-dev-overlay/dist/client.js
index 6c32e39..7d0d3f3 100644
--- a/node_modules/next/dist/compiled/@next/react-dev-overlay/dist/client.js
+++ b/node_modules/next/dist/compiled/@next/react-dev-overlay/dist/client.js
@@ -295,7 +295,7 @@
   .nextjs-container-build-error-body small {
     color: var(--color-font);
   }
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[timkindberg]

I had to delete the .next cache before it took effect

[Zerebokep]

Please invest 5 minutes and add an env var to disable the overlay, thank you.

[akshaykmr]

Hiding the overlay is not enough. When this happens the browser's console is flooded with next-js related logs hampering debugging the cause.

[amyhua]

I've used @sesm's solution for Next v12.

Here are updated steps for Next v14.2.3:

1. Install patch-package (for example, yarn add -D patch-package)
2. Open <PROJECT_ROOT>/node_modules/next/dist/compiled/@next
3. Find text initialDisplayState: "fullscreen" and replace it with initialDisplayState: "minimized" where it occurs.
4. npx patch-package next.
5. Add npx patch-package to your postinstall.
6. Congratulations, you have the patch now! You will probably have to repeat the procedure after upgrading Next.js, because the compiled TS output will likely to change dramatically.

To completely hide overlays, replace "minimized" with "hidden".

In case you run into an issue with patch-package, see this related discussion: ds300/patch-package#300 (comment)

[PhanDangDucit]

How to hidden overlay when environment isn't develepment?

[brunofin]

probably because NODE_ENV is production but I would highly advise AGAINST developing with NODE_ENV=production

[brunofin]

// removes the NextJS14 error toast. probably not a good idea.
nextjs-portal {
  display: none;
}