{"id":"fraction-calculator","engine":"core","category":"math","name":"Exact fraction calculator","fields":[{"key":"a","label":"First fraction","type":"text","default":"2/3","required":true},{"key":"b","label":"Second fraction","type":"text","default":"3/4","required":true},{"key":"operation","label":"Operation","type":"select","default":"add","options":[{"value":"add","label":"Add"},{"value":"subtract","label":"Subtract"},{"value":"multiply","label":"Multiply"},{"value":"divide","label":"Divide"}]}],"sample":{"a":"2/3","b":"3/4","operation":"add"}}