Cesium API for React js

Hello ,I created app and used CesiumJs my app in react worked approximately 1,5 moth but after i had error about authentication(status code 401) . Is Cesium api free ? can i use it long time ?

You have to update CesiumJS or use your access token of Cesium Ion.

Thank you for your answer but , in the first I want to create stable app and it can’t to get any updates , in the second i don’t use any http request to cesium server just for get data from api.n2yo.com but it don’t have a connection to cesium earth map (where i can past my cesium ion api accsess token ? )

component “Viewer” will internally create numerous HTTP requests to the Cesium server.
please read this to set access token

Thank you very much i will try and let you know