push element in jsonb array psql variable code example

Example 1: postgres jsonb array push new element

UPDATE jsontesting
SET jsondata = jsondata || '["newString"]'::jsonb
WHERE id = 7;

Example 2: postgresql update json field key value

UPDATE table_name SET attrs = jsonb_set(cast(attrs as jsonb), '{key}', '"new_value"', true) WHERE id = 'some_id';