How can I create a view from a json array

[RCVZ]

I want to create a view which contains all json objects as rows(their keys as columns) from a table which has a column with json arrays.

[simolus3]

their keys as columns

This doesn't work if you don't know the structure of the JSON elements beforehand, as each row needs to have the same columns and the columns of a view must be inferable without actually running the query, so you can't have the columns depend on which data is in the row.
You can use json_each to use a JSON array in a FROM clause, so if you know the structure (e.g. if all the objects have foo, bar, baz fields), you can do this:

SELECT json.value->>'$.foo' foo, json.value->>'$.bar' bar, json.value->>'$.baz' baz
  FROM main_table tbl
  INNER JOIN json_each(tbl.json_column) json

You can put this into a CREATE VIEW statement to use it as a view.