What should a REST application have in the key field?

Question

Laravel

It is necessary to develop a REST API (CRUD) service.

• - Create elements
  
• - Updating items
  
• - Deleting items
  
• - Getting information about an element
  

Input data:
Entity: Item Entity
fields:
id - int autoincrement
name - char(255)
key - char(25) not null
created_at - datetime - item creation date
updated_at - datetime - item update date
What is the key field for , what should be in it be?
How to make the column be key - char(25) not null ?

Answer 1

What is the key field for

For a certain key as a string of 25 characters.
Exactly what the API designer intended. And this should be reported / indicated in the documentation. How else do you think you should know?
https://laravel.com/docs/migrations#columns - row 5 in the table.