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db<>fiddle
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DECLARE @Content varchar(500) = '{
"File":[
{
"ID":1,
"Fragment":"Frag1"
},
{
"ID":2,
"Fragment":"Frag2"
},
{
"ID":3,
"Fragment":"Frag3"
}]
}';

SELECT COUNT(*)
FROM OPENJSON(@Content, N'$.File')

(No column name)
3