{"id":"loan-payment-calculator","engine":"core","category":"math","name":"Fixed-rate loan calculator","fields":[{"key":"principal","label":"Loan amount","type":"number","default":200000,"required":true,"min":0},{"key":"rate","label":"Annual interest (%)","type":"number","default":5,"required":true,"min":0},{"key":"years","label":"Term in years","type":"number","default":20,"required":true,"min":0.083333,"max":100}],"sample":{"principal":200000,"rate":5,"years":20}}