postgres sql Query a field with Json data

Question

We have a field in a table that contains JSON object. There are array objects inside the json structure and we would have to extract values specifically from the array. Below is a sample data in the json field

 children:[{server:,children:[{server:,newPage:,menuType:3,label:File Tax Forms,url:\/dashboard\/fileTaxForm},{server:,newPage:,menuType:3,label:View Filed Forms,url:dashboard\/viewFiledForms}],

Can you please throw some light on how to extract the values via sql query in the above json object. Any help on this is much appreciated

Thanks in Advance

Answer 1

When adding the json to your question, it seems to have lost quotes.

If the JSON is inserted as follows

INSERT INTO test VALUES ('{"children":[{"server":"","children":[{"server":"","newPage":"","menuType":3,"label":"File Tax Forms","url":"dashboard/fileTaxForm"},{"server":"","newPage":"","menuType":3,"label":"View Filed Forms","url":"dashboard/viewFiledForms"}]}]}');

into a table defined as follows:

CREATE TABLE test (somejson json);     

then you could use a query similar to the following:

SELECT somejson::json->'children'->0->'children'->0->'label' as label, somejson::json->'children'->0->'children'->0->'url' as url  FROM test;

to get a result:

      label       |           url           
------------------+-------------------------
 "File Tax Forms" | "dashboard/fileTaxForm"