benefits of api testing

We can start testing process EARLY and the more bugs we
catch in API level testing, the less bugs we will see on UI. API
level of application is developed before the UI part.

Test for Core Functionality: API testing provides access to
the application without a user interface.

Time Effective: API testing usually is less time consuming
than functional GUI testing. The web elements in GUI testing
must be polled, which makes the testing process slower

Language-Independent: In API testing, data is exchanged
using XML or JSON. These transfer modes are completely
language-independent

Easy Integration with GUI: API tests enable highly integrable
tests, which is particularly useful if you want to perform
functional GUI tests after API testing.