Postgres 12

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SELECT '[{"id": 1}, {"txt": "something"}]'::jsonb  AS jsonb_array
     , '{"{\"id\": 1}","{\"txt\": \"something\"}"}'::jsonb[] AS pg_array_of_jsonb;

jsonb_array
pg_array_of_jsonb

[{"id": 1}, {"txt": "something"}]
{"{"id": 1}","{"txt": "something"}"}

SELECT jsonb_array_elements('[{"id": 1}, {"txt": "something"}]'::jsonb) AS jsonb_element_from_json_array;

jsonb_element_from_json_array

{"id": 1}

{"txt": "something"}

SELECT unnest('{"{\"id\": 1}","{\"txt\": \"something\"}"}'::jsonb[]) AS jsonb_element_from_pg_array;

jsonb_element_from_pg_array

{"id": 1}

{"txt": "something"}