Which languages should i learn to create custom API

Question

I want create Custom API what are the languages that should i learn and any course that will fit right.

Answer 1

javascript

Answer 2

APIs can be made with any language.

Answer 3

APIs are a general programming concept, any course includes this at some rate.

Answer 4

Any language.

Answer 5

which course should i do

Answer 6

php

Answer 7

Depends on what the API does