Javascript API Dependency

[VitalyVogel]

I apologize if this been asked before, but can't seem, to find a clear answer anywhere: 

Is there a dependency on specific ArcGIS server version between JavaScript API and ArcGIS? We're planning to migrate from JavaScript API 3.15 to 3.21. Our current ArcGIS Server is at version 10.3.1. Will they be compatible, or do we have to upgrade ArcGIS Server as well?

Thanks!

[thejuskambi]

I think you should be good. Untill recent, we were using ArcGIS Server 10.1 and the JS API was working fine.

I think any 10.x server should be fine for 3.x version API.