Html and node js

Question

Hello i am learning node js for backend from a tutorial on YouTube. In the tutorial that guy used this {%var_name%} and then using node js he replaced this by an api data.

My question is that what is this thing called. {%var_name%}

Answer 1

I'd say it's called dynamic variable names, but not sure about percentage symbols, does your tutorial has something to do with PHP too?

Answer 2

Sorry i forgot to remove the question. I already got the answer. Sorry for wasting your time. {%var_name} this wasn't any variable. He used it just as a string and then replaced it with api data while creating response.