{"id":"fuel-economy-converter","engine":"core","category":"converter","name":"燃費の換算","fields":[{"key":"value","label":"値","type":"number","default":7,"required":true,"min":0.000001},{"key":"from","label":"変換元","type":"select","default":"l100","options":[{"value":"l100","label":"L/100 km"},{"value":"us","label":"US mpg"},{"value":"uk","label":"Imp mpg"}]},{"key":"to","label":"変換先","type":"select","default":"us","options":[{"value":"us","label":"US mpg"},{"value":"uk","label":"Imp mpg"},{"value":"l100","label":"L/100 km"}]}],"sample":{"value":7,"from":"l100","to":"us"}}