{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/zestful/main/json-schema/zestful-ingredient-schema.json",
  "title": "Zestful Parsed Ingredient",
  "description": "Structured representation of a parsed recipe ingredient from the Zestful API, including quantity, unit, product name, preparation notes, and USDA FoodData Central match.",
  "type": "object",
  "properties": {
    "ingredientRaw": {
      "type": "string",
      "description": "The original unparsed ingredient string as submitted."
    },
    "ingredientParsed": {
      "type": "object",
      "description": "Structured breakdown of the parsed ingredient.",
      "properties": {
        "quantity": {
          "type": ["number", "null"],
          "description": "Numeric quantity of the ingredient (e.g., 2 for '2 cups flour')."
        },
        "unit": {
          "type": ["string", "null"],
          "description": "Measurement unit in singular form (e.g., 'cup', 'teaspoon', 'tablespoon')."
        },
        "productSizeModifier": {
          "type": ["string", "null"],
          "description": "Size descriptor for the ingredient (e.g., 'large', 'small')."
        },
        "product": {
          "type": "string",
          "description": "The purchasable item name (e.g., 'all-purpose flour', 'kosher salt')."
        },
        "preparationNotes": {
          "type": ["string", "null"],
          "description": "Preparation instructions (e.g., 'melted', 'beaten', 'finely chopped')."
        },
        "usdaInfo": {
          "type": ["object", "null"],
          "description": "USDA FoodData Central database match for this ingredient.",
          "properties": {
            "fdcId": {
              "type": "string",
              "description": "USDA FoodData Central identifier."
            },
            "matchMethod": {
              "type": "string",
              "enum": ["exact", "closestUnbranded", "closestBranded"],
              "description": "Method used to match the ingredient to the USDA database."
            },
            "category": {
              "type": "string",
              "description": "USDA food category (e.g., 'Dairy and Egg Products')."
            },
            "description": {
              "type": "string",
              "description": "USDA database description of the matched food item."
            }
          }
        }
      },
      "required": ["product"]
    },
    "confidence": {
      "type": "number",
      "minimum": 0,
      "maximum": 1,
      "description": "Model confidence score (0.0–1.0) for the parse result."
    },
    "error": {
      "type": ["string", "null"],
      "description": "Error message if the ingredient could not be parsed."
    }
  },
  "required": ["ingredientRaw", "ingredientParsed", "confidence"]
}