How to parse json value of text column in postgres

Question

I have a column of text type be contain json value.

{"summary":"this is a example","url":"stackoverflow.com"}

How can I extract 'url' json field of column in postgres with query?

I used of following query:

 SELECT jvalue->>'url' From table;

With my query, I get following error.

SQL Error [42883]: ERROR: operator does not exist: text ->> unknown Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts. org.postgresql.util.PSQLException: ERROR: operator does not exist: text ->> unknown Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts.

Solution

You could use the -> operator:

SELECT '{"summary":"this is a example","url":"stackoverflow.com"}'::json->'url';

Comments

[mwKART]

what if i have a json value like, {"summary":"this is a example","uri" : [{"url":"stackoverflow.com"}]}, how to get url

[lgx]

note that it will display "stackoverflow.com" instead of stackoverflow.com. So it includes quotation marks