Detect dev mode within javascript files

Is there a way to detect when I am in dev mode within my javascript files. The reason being is that I am using wp-api-request to get a REST posts collection and I get a console error.

My dev server is :


and production server is:


When I make the request in dev mode I get a console error,

http://localhost:8000/wp-json/wp/v2/posts 403 (Forbidden)

This is confirmed when I print out wpApiSettings.root. It shows as,

wpApiSettings.root = 'http://localhost:8000/wp-json/

Is there a config variable I can access to detect when I am using the dev server so that I can change wpApiSettings.root to the dev sever?

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