As others have mentioned, this should be implemented as a validation endpoint in cr-buildbucket.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Nodir, has validation been added for this already?

for this particular case (https://chrome-internal-review.googlesource.com/c/infradata/config/+/304482), yes
luci-config rejects *.json files that are not valid JSON.

A bad config file can still cause 500s though, e.g. if someone makes it {}. This kind of validation is not done.