jsonb_set()

Returns target with the item designated by path replaced by new_value, or with new_value added if create_if_missing is true (which is the default) and the item designated by path does not exist. All earlier steps in the path must exist, or the target is returned unchanged. As with the path oriented operators, negative integers that appear in the path count from the end of JSON arrays. If the last path step is an array index that is out of range, and create_if_missing is true, the new value is added at the beginning of the array if the index is negative, or at the end of the array if it is positive.

jsonb_set ( target jsonb, path text[], new_value jsonb [, create_if_missing boolean ] ) → jsonb

SELECT jsonb_set('[{"f1":1,"f2":null},2,null,3]', '{0,f1}', '[2,3,4]', false);

[{"f1": [2, 3, 4], "f2": null}, 2, null, 3]

SELECT jsonb_set('[{"f1":1,"f2":null},2]', '{0,f3}', '[2,3,4]');

[{"f1": 1, "f2": null, "f3": [2, 3, 4]}, 2]

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