Conditional ON in a stored procedure with OPENJSON - sql

Question

I have this stored procedure that inserts data into a table from an API string that is passed to the OPENJSON function. This API though, sometimes renders a different key name according to the length of the value.
For instance:
{
{
"id":"1",
"shortName": Alex
},
"id":"2",
"longName": Alexander
}
}
Stored procedure:
CREATE PROCEDURE dbo.uspAddToTable
#json NVARCHAR(MAX)
AS
BEGIN
INSERT INTO dbo.MyTable (id, name)
SELECT id, name
FROM OPENJSON(#json)
WITH
(id integer '$.id',
name varchar(100) '$.shortName' /* here how do I do: OR '$.longName' if '$.shortName' does not exist */
) tbl
Is this possible in the stored procedure to take one or the other key value name depending if it can't find the default shortName to longName?

Answer 1

What you need to do, instead, is return both columns in your OPENJSON call, and then use COALESCE or ISNULL in your SELECT to return the non-NULL value:
CREATE PROCEDURE dbo.uspAddToTable #json nvarchar(MAX)
AS
BEGIN
INSERT INTO dbo.MyTable (id,name)
SELECT id,
ISNULL(shortName,longName)
FROM OPENJSON(#json)
WITH (id int,
shortName varchar(100),
longName varchar(100)) OJ;
END;
I assume here that one of the other will be NULL or that shortName is the "prioritised" value.