Describe the bug
In some cases, specially on slower network devices (also happens simulating slow network in chrome dev tools), the page invalidation call to __data.json contains invalid json making JSON.parse fail.
`{"id":239,�"url":240,`
Reproduction
I've only experienced this issue on routes having a streamed promise from a load function.
This issue has been poping up in my sentry issues for almoast a year and kept happening about 10 to 20 times a day for various users. I could never reproduce the issue my self so i put it of as a user issue with their network. Today this exact issue happened to me in my local dev environment which implies it most likely is not a user network issue and made me open this bug report.
Logs
__Local error:__
VM26528:1 Uncaught (in promise) SyntaxError: Expected ',' or '}' after property value in JSON at position 57040 (line 1 column 57041)
at JSON.parse (<anonymous>)
at client.js?v=55e50156:2943:23
VM26529:1 Uncaught (in promise) SyntaxError: Expected double-quoted property name in JSON at position 11079 (line 1 column 11080)
at JSON.parse (<anonymous>)
at client.js?v=55e50156:2943:23
happening in the `function load_data(url, invalid)` function
__One of the errors reported in Sentry:__
SyntaxError
Unexpected token '�', "�{"type":""... is not valid JSONSystem Info
System:
OS: Windows 11 10.0.26200
CPU: (24) x64 13th Gen Intel(R) Core(TM) i7-13700KF
Memory: 28.95 GB / 63.86 GB
Binaries:
Node: 22.17.1 - C:\nvm4w\nodejs\node.EXE
npm: 10.9.2 - C:\nvm4w\nodejs\npm.CMD
Browsers:
Chrome: 145.0.7632.160
Edge: Chromium (145.0.3800.82)
Internet Explorer: 11.0.26100.7309
npmPackages:
@sveltejs/adapter-node: ^5.5.3 => 5.5.3
@sveltejs/kit: ^2.53.0 => 2.53.0
svelte: ^5.53.2 => 5.53.2
vite: ^6.3.0 => 6.4.1Severity
annoyance
Additional Information
I can't verify it reliably but it seems like its happening more often when more requests to the invalidation endpoint are being issued.
Describe the bug
In some cases, specially on slower network devices (also happens simulating slow network in chrome dev tools), the page invalidation call to __data.json contains invalid json making JSON.parse fail.
Reproduction
I've only experienced this issue on routes having a streamed promise from a load function.
This issue has been poping up in my sentry issues for almoast a year and kept happening about 10 to 20 times a day for various users. I could never reproduce the issue my self so i put it of as a user issue with their network. Today this exact issue happened to me in my local dev environment which implies it most likely is not a user network issue and made me open this bug report.
Logs
System Info
System: OS: Windows 11 10.0.26200 CPU: (24) x64 13th Gen Intel(R) Core(TM) i7-13700KF Memory: 28.95 GB / 63.86 GB Binaries: Node: 22.17.1 - C:\nvm4w\nodejs\node.EXE npm: 10.9.2 - C:\nvm4w\nodejs\npm.CMD Browsers: Chrome: 145.0.7632.160 Edge: Chromium (145.0.3800.82) Internet Explorer: 11.0.26100.7309 npmPackages: @sveltejs/adapter-node: ^5.5.3 => 5.5.3 @sveltejs/kit: ^2.53.0 => 2.53.0 svelte: ^5.53.2 => 5.53.2 vite: ^6.3.0 => 6.4.1Severity
annoyance
Additional Information
I can't verify it reliably but it seems like its happening more often when more requests to the invalidation endpoint are being issued.