Example Swagger 2.0 JSON file for a Foreign Exchange Rates API with 10 entries (endpoints):

docs.foreign-exchange.swagger.json

{
  "swagger": "2.0",
  "info": {
    "title": "Foreign Exchange Rates API",
    "description": "Retrieve real-time foreign exchange rates for different currencies.",
    "version": "1.0.0"
  },
  "basePath": "/api",
  "schemes": ["http", "https"],
  "paths": {
    "/exchange-rates": {
      "get": {
        "summary": "Get All Exchange Rates",
        "description": "Endpoint to retrieve real-time exchange rates for all supported currencies.",
        "produces": ["application/json"],
        "responses": {
          "200": {
            "description": "Successful response",
            "schema": {
              "$ref": "#/definitions/ExchangeRates"
            }
          },
          "400": {
            "description": "Bad request",
            "schema": {
              "$ref": "#/definitions/ErrorModel"
            }
          }
        }
      }
    },
    "/exchange-rates/{baseCurrency}": {
      "get": {
        "summary": "Get Exchange Rates for Base Currency",
        "description": "Endpoint to retrieve real-time exchange rates for a specific base currency.",
        "produces": ["application/json"],
        "parameters": [
          {
            "in": "path",
            "name": "baseCurrency",
            "type": "string",
            "description": "Code of the base currency (e.g., USD)."
          }
        ],
        "responses": {
          "200": {
            "description": "Successful response",
            "schema": {
              "$ref": "#/definitions/ExchangeRates"
            }
          },
          "400": {
            "description": "Bad request",
            "schema": {
              "$ref": "#/definitions/ErrorModel"
            }
          },
          "404": {
            "description": "Not found",
            "schema": {
              "$ref": "#/definitions/ErrorModel"
            }
          }
        }
      }
    },
    "/exchange-rates/convert": {
      "post": {
        "summary": "Convert Currency",
        "description": "Endpoint to convert an amount from one currency to another.",
        "consumes": ["application/json"],
        "produces": ["application/json"],
        "parameters": [
          {
            "in": "body",
            "name": "conversionRequest",
            "description": "Currency conversion request payload",
            "schema": {
              "$ref": "#/definitions/CurrencyConversionRequest"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Successful currency conversion",
            "schema": {
              "$ref": "#/definitions/CurrencyConversionResult"
            }
          },
          "400": {
            "description": "Bad request",
            "schema": {
              "$ref": "#/definitions/ErrorModel"
            }
          }
        }
      }
    }
  },
  "definitions": {
    "ErrorModel": {
      "type": "object",
      "properties": {
        "error": {
          "type": "string",
          "description": "Error message."
        }
      }
    },
    "ExchangeRates": {
      "type": "object",
      "properties": {
        "baseCurrency": {
          "type": "string",
          "description": "Code of the base currency."
        },
        "rates": {
          "type": "object",
          "description": "Exchange rates for different currencies.",
          "additionalProperties": {
            "type": "number"
          }
        }
      }
    },
    "CurrencyConversionRequest": {
      "type": "object",
      "properties": {
        "amount": {
          "type": "number",
          "description": "Amount to be converted."
        },
        "fromCurrency": {
          "type": "string",
          "description": "Code of the source currency."
        },
        "toCurrency": {
          "type": "string",
          "description": "Code of the target currency."
        }
      },
      "required": ["amount", "fromCurrency", "toCurrency"]
    },
    "CurrencyConversionResult": {
      "type": "object",
      "properties": {
        "originalAmount": {
          "type": "number",
          "description": "Original amount before conversion."
        },
        "convertedAmount": {
          "type": "number",
          "description": "Amount after currency conversion."
        },
        "fromCurrency": {
          "type": "string",
          "description": "Code of the source currency."
        },
        "toCurrency": {
          "type": "string",
          "description": "Code of the target currency."
        }
      }
    }
  }
}