KITFORMA · EDITORIAL ANSWER
How do I distinguish JSON null from SQL NULL in PostgreSQL?
KitForma editorial guide. A JSON document can contain the JSON value null while the SQL column itself remains non-NULL. Missing keys add another distinct case.
Step-by-step answer
A JSON document can contain the JSON value null while the SQL column itself remains non-NULL. Missing keys add another distinct case.
Use JSON operators with awareness of whether they return JSON or text, and test key existence separately where needed. Build fixtures for a NULL column, an empty object and an object containing
"value": null. Do not rely on one COALESCE to express every distinction. Document how the API maps these states; otherwise a patch intended to clear a field can be mistaken for a field that was never supplied.Sources and verification
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