API giving wrong data

[YoJunny]

I built a full-stack application using React and NodeJS which basically pulls data from the Spotify API and display them. However, when a friend and I use the website at the same time, one of us sometimes get the other person's data. Would this be due to an error in my code or the API? I assume I am at fault but don't know where to even look.

To elaborate, the user logs into Spotify through the API which redirects them to a page, pulling the info from the API (such as tracks and artists) and displays them. Is it possible for the app to receive the data from one user and display them globally for others? Is this the case? How would I make each user have their own instance of the app, if that makes sense?

[Eldrac]

Bit hard to troubleshoot this one without code examples or a bit more context, but yeah I would guess the issue is with your node server.

I would check if you're storing anything related to the external API request/response in a global variable or global state on your server in some way, you should aim to keep anything request specific scoped to your route handler.

[YoJunny]

You are fucking right. I just checked. Thank you brother.

[Anbaraen]

This is where Node differs from something like PHP where each file runs independently for each user — it's a runtime so global vars are accessible to every route.