JSON_ARRAY_INSERT

Introduced or updated: v1.2.644

Inserts a value into a JSON array at the specified index and returns the updated JSON array.

Syntax

JSON_ARRAY_INSERT(<json_array>, <index>, <json_value>)

Parameter	Description
<json_array>	The JSON array to modify.
<index>	The position at which the value will be inserted. Positive indices insert at the specified position or append if out of range; negative indices insert from the end or at the beginning if out of range.
<json_value>	The JSON value to insert into the array.

Return Type

JSON array.

Examples

When the <index> is a non-negative integer, the new element is inserted at the specified position, and existing elements are shifted to the right.

-- The new element is inserted at position 0 (the beginning of the array), shifting all original elements to the right
SELECT JSON_ARRAY_INSERT('["task1", "task2", "task3"]'::VARIANT, 0, '"new_task"'::VARIANT);

-[ RECORD 1 ]-----------------------------------
json_array_insert('["task1", "task2", "task3"]'::VARIANT, 0, '"new_task"'::VARIANT): ["new_task","task1","task2","task3"]

-- The new element is inserted at position 1, between task1 and task2
SELECT JSON_ARRAY_INSERT('["task1", "task2", "task3"]'::VARIANT, 1, '"new_task"'::VARIANT);

-[ RECORD 1 ]-----------------------------------
json_array_insert('["task1", "task2", "task3"]'::VARIANT, 1, '"new_task"'::VARIANT): ["task1","new_task","task2","task3"]

-- If the index exceeds the length of the array, the new element is appended at the end of the array
SELECT JSON_ARRAY_INSERT('["task1", "task2", "task3"]'::VARIANT, 6, '"new_task"'::VARIANT);

-[ RECORD 1 ]-----------------------------------
json_array_insert('["task1", "task2", "task3"]'::VARIANT, 6, '"new_task"'::VARIANT): ["task1","task2","task3","new_task"]

A negative <index> counts from the end of the array, with -1 representing the position before the last element, -2 before the second last, and so on.

-- The new element is inserted just before the last element (task3)
SELECT JSON_ARRAY_INSERT('["task1", "task2", "task3"]'::VARIANT, -1, '"new_task"'::VARIANT);

-[ RECORD 1 ]-----------------------------------
json_array_insert('["task1", "task2", "task3"]'::VARIANT, - 1, '"new_task"'::VARIANT): ["task1","task2","new_task","task3"]

-- Since the negative index exceeds the array’s length, the new element is inserted at the beginning
SELECT JSON_ARRAY_INSERT('["task1", "task2", "task3"]'::VARIANT, -6, '"new_task"'::VARIANT);

-[ RECORD 1 ]-----------------------------------
json_array_insert('["task1", "task2", "task3"]'::VARIANT, - 6, '"new_task"'::VARIANT): ["new_task","task1","task2","task3"]