Psycopg2 invalid json when returning postgres query

Question

I am using Django to access a stored function in my postgres DB. When I execute the function inside of Postgres, it returns doublequotes and valid json. However, when I call the function from Django (which uses psycopg2) the doublequotes are removed and single quotes replace them.

It seems psycopg2 is doing some type of conversion to lists / dictionary in the background. However, I need to keep the json. Any ideas how to resolve this?

Answer 1

You can override the functionality of psycopg2 auto converting the JSON object/array by registering a no-op function with register_default_json()

psycopg2.extras.register_default_json(loads=lambda x: x)

Quote from the Docs

Psycopg automatically converts PostgreSQL json data into Python objects. How can I receive strings instead? The easiest way to avoid JSON parsing is to register a no-op function with register_default_json():

psycopg2.extras.register_default_json(loads=lambda x: x) See JSON adaptation for further details.

• Source http://initd.org/psycopg/docs/faq.html?highlight=json#problems-with-type-conversions

Additional Reading

• http://initd.org/psycopg/docs/extras.html#adapt-json
• https://docs.djangoproject.com/en/2.2/ref/contrib/postgres/fields/#jsonfield (Not sure what you're attempting to do with the stored function but this may help alleviate the need for one)