Angular · Senior · Question 67 of 75

In Angular SSR, where does user data typically leak between requests?

✓Correct answer: In module-level mutable variables shared by the Node process - providedIn: 'root' services get a new instance per request
2In every providedIn: 'root' service, because they are global across requests
3In the browser's HTTP cache

Explanation

Avoid module-level mutable state (like let cache = {} outside a class); keep state in services so it's scoped per request.

Further reading

Test yourself

Take the Angular · Senior quiz: questions and options are shuffled, and you get a review of your mistakes at the end.