for what you can use angular service code example
Example 1: angular create a service
>>> ng generate service service_name
or
>>> ng generate service /folder-name/service-name
Example 2: angular new service
ng g s serviceName
Example 3: make service in angular 8
For Creating Service you have type command like below
ng generate service service-name
or
ng g s service-name
And if you want to make service into folder
ng generate service /folder-name/service-name
or
ng g s /folder-name/service-name