Insert an object into a JSON array in SQL Server

Question

Every example that I\'ve seen for JSON_MODIFY shows inserting a simple value such as a string into an array.

Suppose I have the following JSON

Answer 1

You should wrap the third parameter of your JSON_MODIFY statement with JSON_QUERY():

UPDATE TheTable 
SET TheJSON = JSON_MODIFY(TheJSON, 'append $', JSON_QUERY(N'{"id": 3, "name": "Three"}')) 
WHERE Condition = 1;

Here is a complete sample:

DECLARE @TheTable table(TheJSON nvarchar(max), Condition int )
DECLARE @mystring nvarchar(100)='{"id": 3, "name": "Three"}'

INSERT INTO @TheTable SELECT '[{"id": 1, "name": "One"}, {"id": 2, "name": "Two"}]', 1

UPDATE @TheTable 
SET TheJSON = JSON_MODIFY(TheJSON, 'append $', JSON_QUERY(N'{"id": 3, "name": "Three"}')) 
WHERE Condition = 1;

SELECT TheJSON FROM @TheTable

This is the final output:

[{"id": 1, "name": "One"}, {"id": 2, "name": "Two"},{"id": 3, "name": "Three"}]

More info on JSON_QUERY here, and the explation of the issue is here.