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.

Mureinik · Accepted Answer · 2015-07-30 14:12:46Z

24

You could use the -> operator:

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

answered Jul 30, 2015 at 14:12

Mureinik

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6 Comments

mwKART Over a year ago

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

lgx Over a year ago

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

Ram Over a year ago

Use data::json->>'url' if you don't want double quotes around string. postgresql.org/docs/current/functions-json.html

Alex Over a year ago

What if the value is a json string: SELECT '"{\"summary\":\"this is a example\",\"url\":\"stackoverflow.com\"}"'

PapaFreud Over a year ago

The missing sauce I was missing was not -> but the ::json part, because it's stored in a text column.

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