Api connection problem

When i use api in external react app its displaying this error
==> Access to fetch at ‘http://192.168.1.117:8000/api/method/estate_app.estate_app.doctype.property.api.allProperty’ from origin ‘http://localhost:3000’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled… how to fix this