{"id":"rectangle-calculator","engine":"core","category":"math","name":"Kalkulator prostokąta","fields":[{"key":"width","label":"Szerokość","type":"number","default":16,"required":true,"min":0.000001},{"key":"height","label":"Wysokość","type":"number","default":9,"required":true,"min":0.000001}],"sample":{"width":16,"height":9}}