Wrongly display object

  Kiến thức lập trình

I’m new to Angular and below I try to display the object res. As you can see res has type Course[], but when I try to display it in the console, I got the object Blob. Is there something wrong with it?
console
code

I have no idea what is going wrong, I thought that the console should log the type Course[], right? Thank you for your time reading and solving.

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