Parse JSON object in postgresql (Migrating from MongoDB to PSQL) - json

Question

I've been using pgfutter to import a JSON file to postgresql.
Now I am trying to parse that json file to my psql table. This is my table:
CREATE TABLE organisation (
id int8 PRIMARY KEY NOT NULL,
department VARCHAR(255),
business_type VARCHAR(255),
unit_active INTEGER
);
This is an example of my json:
{
"extension":[
{
"name":"unitActive",
"value":"Active"
},
{
"name" : "businessType",
"value" : "Other"
},
{
"name":"specialities",
"value":[
{
"value":"allm kirurgi"
},
{
"value":"neurologi"
},
{
"value":"ortopedisk kirurgi"
}]
}],
"catalog":"main",
"department":"hospital"
}
I've been looking at the postgresql documentation but i'm not quite sure how to normalize the object, in this case the extension object in my JSON.
This is what I got
INSERT INTO organisation
SELECT nextval('organisationsSequence'),
data->>'department' as department,
"Something here" as business_type,
"Something here" as unit_active
FROM import.collection WHERE data->>'catalog' = 'main';
So what i'm trying to achieve is to do something like "Select extension.value where extension.name = businessType"