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Is there a way to modify an existing column of HSTORE datatype (that has data) to JSON datatype in a Postgres database?

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You can simple use hstore_to_json function to get a json out of a hstore. To change the table you can use the ALTER TABLE command.

Example:

ALTER TABLE table_name
    ALTER your_column_name TYPE json USING hstore_to_json(your_column_name);

There is hstore_to_jsonb too if you want jsonb instead of json.

  • 2
    Thought it's worth mentioning. This only works for Posgresql 9.3 version and above. – DUnkn0wn1 Sep 14 '16 at 17:36
  • Do you know whether there any performance benefits of doing so? – Milan Velebit Sep 21 '18 at 12:53

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