const convertor = require('ajv-to-swagger');
 
// some kind of AJV schema which we provide as a response
const ajvResponseSchema = {
  type: 'object',
  properties: {
    currency: { type: 'string', minLength: 3, maxLength: 3 },
    id: { type: 'string', minLength: 36, maxLength: 36 },
    version: { enum: [2] },
    rates: {
      type: 'object',
      example: {
        USDEUR: '0.881367883',
        USDRUB: '67.905200000'
        },
      patternProperties: {
        '^[A-Z]{6}$': { type: 'string' },
      },
      additionalProperties: false,
    },
  },
  additionalProperties: false,
};
  
// make a draft of your schema without a response schema:
const baseSchema = 
    {
      "openapi": "3.0.1",
      "info": {
        "title": "defaultTitle",
        "description": "defaultDescription",
        "version": "0.1"
      },
      "servers": [
        {
          "url": "https://google.com"
        }
      ],
      "paths": {
        "/get/some/": {
          "get": {
            "description": "Auto generated using Swagger Inspector",
            "parameters": [
              {
                "name": "cs",
                "in": "query",
                "schema": {
                  "type": "string"
                },
                "example": "E"
              }
            ],
            "responses": {
              "200": {
                "description": "Auto generated using Swagger Inspector",
                "content": {
                  "application/json": {
                    "schema": {}
                  }
                }
              }
            },
            "servers": [
              {
                "url": "https://google.com"
              }
            ]
          },
          "servers": [
            {
              "url": "https://google.com"
            }
          ]
        }
      }
    };
 
const responseSwagger = convertor.convertSchema(ajvResponseSchema);
 
// put your schema where it needs to be
baseSchema.paths['/get/some/'].get.responses['200'].content['application/json'].schema = responseSwagger.schema;