Hi @ShubhamTyagi,
The credentials.json is only used for registering automatically the app to a specific Jira instance.
It is only part of the Atlassian Connect Express toolkit and not of Connect itself.
It’s important to never commit it because it contains a user API token, so it should be added to .gitignore.
As it is intended to help when developing and testing the app, it should not be included in the release that is provided to customers.
Cheers,
Caterina