`Front-end` vs `frontend` vs `front end`

Front end

The terms front-end, frontend, and front end are used interchangeably to refer to the part of a software application that the user interacts with.

If you want to use the correct term however, use front end as a noun and front-end as an adjective.

For example:

The front end is maintained by front-end developers.

Back end

The same applies to back-end, backend, and back end, which refer to the part of the application that the user does not interact with directly.

For example:

The back end is maintained by back-end developers.