Imagine you have a front-end, a GET ALL endpoint returns a list of users with ID and name, and at some point, instead of ID, an incorrect value is displayed in the column. How would you localize this problem?

To localize the issue with incorrect display of user IDs on the frontend, I would systematically check the following levels:

1. Backend data verification:

   • Make a request to the GET ALL endpoint directly (for example, via Postman or curl) and check if the IDs are returned correctly.
   • If the data on the server is correct, then the problem lies on the frontend.

2. Frontend data processing check:

   • Look at how the frontend processes and displays the received data.
   • Check if there is any transformation or error during ID mapping.

3. UI components verification:

   • Ensure that the component displaying the ID receives the correct props and renders them properly.

4. Logging and debugging:

   • Add logging on the frontend to see what values are received and how they change.

5. Caching check:

   • It is possible that data is cached and outdated or corrupted information is displayed.

6. Code changes review:

   • Review the latest commits related to this functionality, as there might be an error.

Thus, the problem could be at the API level or the frontend level, and a systematic check will help localize the source of the incorrect value.