SQL Server 2016 JSON's ISJSON() Function

ISJSON.sql

SELECT ISJSON('{ "Color" : "Blue" }') -- Returns 1, valid
-- Output: 1

SELECT ISJSON('{ "Color" : Blue }') -- Returns 0, invalid, missing quotes
-- Output: 0

SELECT ISJSON('{ "Number" : 1 }') -- Returns 1, valid, numbers are allowed
-- Output: 1

SELECT ISJSON('{ "PurchaseDate" : "2015-08-18T00:00:00.000Z" }') -- Returns 1, valid, dates are just strings in ISO 8601 date format https://en.wikipedia.org/wiki/ISO_8601
-- Output: 1

SELECT ISJSON('{ "PurchaseDate" : 2015-08-18 }') -- Returns 0, invalid
-- Output: 0