bagaimana cara mengonversi teks ke jsonB

Menurut Dokumentasi Postgres :

IMHO Anda memberikan string berformat JSON, maka Anda harus menggunakan metode pertama.

to_json('Fred said "Hi."'::text)  --> "Fred said \"Hi.\""

Jika Anda mencoba mendapatkan array elemen menggunakan to_json(text) Anda akan mendapatkan kesalahan berikutnya:

select *
from jsonb_array_elements_text(to_jsonb('[{"field":15,"operator":0,"value":"1"},{"field":15,"operator":0,"value":"2"},55]'::text));

Tetapi jika Anda sebelumnya melemparkannya ke json:

select *
from jsonb_array_elements_text(to_jsonb('[{"field":15,"operator":0,"value":"1"},{"field":15,"operator":0,"value":"2"},55]'::json));

+--------------------------------------------+
|                    value                   |
+--------------------------------------------+
| {"field": 15, "value": "1", "operator": 0} |
+--------------------------------------------+
| {"field": 15, "value": "2", "operator": 0} |
+--------------------------------------------+
| 55                                         |
+--------------------------------------------+