Config Swagger Express with yaml files.

server.js

const swaggerJsdoc = require("swagger-jsdoc");
const swaggerUI = require('swagger-ui-express');

const options = {
  definition: {
      openapi: "3.0.0",
      info: {
          "title": "Server Importacion",
          "version": "1.0.0"
      },
      servers: [{
          "url": `http://localhost:${PORT}/api/v1`,
          "description": "Servidor de Importación de Documentos Electrónicos"
      }],
      basePath: '/v1/',
  },
  apis: ['./documentation/*.yaml','./documentation/*.yml']

}
const openapiSpecification = swaggerJsdoc(options);