e.g. fetching JSON data

Preparation of Test Data
test=# 
create table T_JSON_DATA (id INTEGER, body JSON);

test=#
insert into T_JSON_DATA
values (1, '{ "name":"John", "age":30, "city":"New York" }');

test=#
insert into T_JSON_DATA
values (2, '{ "name":"Alex", "age":25, "city":"China" }');

test=#
insert into T_JSON_DATA
values (3, '{ "name":"Guru", "age":21, "city":"Russia" }');

test=#
insert into T_JSON_DATA
values (4, '{ "name":"Maximus", "age":25, "city":"Somewhere" }');

test=# commit;

Examples for populating test data
test=#
select * from T_JSON_DATA;

-- to retrieve specific field data
test=#
select body->>'name' from T_JSON_DATA;

-- with aliases
test=#
select body->'name' AS NAME, body->'city' AS CITY from T_JSON_DATA;

-- use with where clause
test=#
select body->'name' AS NAME, body->'city' AS CITY from T_JSON_DATA where id = 1;