NestJS · Middle · Question 57 of 75

How can you read the current request ID in deep services without passing it through every call?

1Make every service request-scoped
✓Correct answer: With AsyncLocalStorage (e.g. the nestjs-cls package), set in middleware at the start of each request
3Store it in a global variable

Explanation

ALS follows the async context of the request without the performance cost of request-scoped providers.

Further reading

Test yourself

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