Express-jsdoc-swagger NPM

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express-jsdoc-swagger

With this library, you can document your express endpoints using swagger OpenAPI 3 Specification without writing YAML or JSON. You can write comments similar to jsdoc on each endpoint, and the dependecy is going to create the swagger UI.

Prerequisites

This library assumes you are using:

Installation

npm i express-jsdoc-swagger

Basic Usage

// index.js file
const express = require('express');
const expressJSDocSwagger = require('express-jsdoc-swagger');

const options = {
  info: {
    version: '1.0.0',
    title: 'Albums store',
    license: {
      name: 'MIT',
    },
  },
  security: {
    BasicAuth: {
      type: 'http',
      scheme: 'basic',
    },
  },
  // Base directory which we use to locate your JSDOC files
  baseDir: __dirname,
  // Glob pattern to find your jsdoc files (multiple patterns can be added in an array)
  filesPattern: './**/*.js',
  // URL where SwaggerUI will be rendered
  swaggerUIPath: '/api-docs',
  // Expose OpenAPI UI
  exposeSwaggerUI: true,
  // Expose Open API JSON Docs documentation in `apiDocsPath` path.
  exposeApiDocs: false,
  // Open API JSON Docs endpoint.
  apiDocsPath: '/v3/api-docs',
  // Set non-required fields as nullable by default
  notRequiredAsNullable: false,
  // You can customize your UI options.
  // you can extend swagger-ui-express config. You can checkout an example of this
  // in the `example/configuration/swaggerOptions.js`
  swaggerUiOptions: {},
  // multiple option in case you want more that one instance
  multiple: true,
};

const app = express();
const PORT = 3000;

expressJSDocSwagger(app)(options);

/**
 * GET /api/v1
 * @summary This is the summary of the endpoint
 * @return {object} 200 - success response
 */
app.get('/api/v1', (req, res) => res.json({
  success: true,
}));

app.listen(PORT, () => console.log(`Example app listening at http://localhost:${PORT}`));

Basic Examples

Basic configuration options.

const options = {
  info: {
    version: '1.0.0',
    title: 'Albums store',
    license: {
      name: 'MIT',
    },
  },
  security: {
    BasicAuth: {
      type: 'http',
      scheme: 'basic',
    },
  },
  baseDir: __dirname,
  // Glob pattern to find your jsdoc files (multiple patterns can be added in an array)
  filesPattern: './**/*.js',
};

Components definition

/**
 * A song type
 * @typedef {object} Song
 * @property {string} title.required - The title
 * @property {string} artist - The artist
 * @property {number} year - The year - double
 */

Endpoint which returns a Songs model array in the response.

/**
 * GET /api/v1/albums
 * @summary This is the summary of the endpoint
 * @tags album
 * @return {array<Song>} 200 - success response - application/json
 */
app.get('/api/v1/albums', (req, res) => (
  res.json([{
    title: 'abum 1',
  }])
));

Endpoint PUT with body and path params which returns a Songs model array in the response.

/**
 * PUT /api/v1/albums/{id}
 * @summary Update album
 * @tags album
 * @param {string} name.path - name param description
 * @param {Song} request.body.required - songs info
 * @return {array<Song>} 200 - success response - application/json
 */
app.put('/api/v1/albums/:id', (req, res) => (
  res.json([{
    title: 'abum 1',
  }])
));

Basic endpoint definition with tags, params and basic authentication

/**
 * GET /api/v1/album
 * @summary This is the summary of the endpoint
 * @security BasicAuth
 * @tags album
 * @param {string} name.query.required - name param description
 * @return {object} 200 - success response - application/json
 * @return {object} 400 - Bad request response
 */
app.get('/api/v1/album', (req, res) => (
  res.json({
    title: 'abum 1',
  })
));

Basic endpoint definition with code example for response body

/**
 * GET /api/v1/albums
 * @summary This is the summary of the endpoint
 * @tags album
 * @return {array<Song>} 200 - success response - application/json
 * @example response - 200 - success response example
 * [
 *   {
 *     "title": "Bury the light",
 *     "artist": "Casey Edwards ft. Victor Borba",
 *     "year": 2020
 *   }
 * ]
 */
app.get('/api/v1/albums', (req, res) => (
  res.json([{
    title: 'track 1',
  }])
));

You can find more examples here, or visit our documentation.

Validator

We developed a new package works as a validator of your API endpoints and the documentation you create with this package. This package is express-oas-validator.

Example

Install using the node package registry:

npm install --save express-oas-validator

We have to wait until we have the full swagger schema to initiate the validator.

// validator.js
const { init } = require('express-oas-validator');

const validators = instance => new Promise((resolve, reject) => {
  instance.on('finish', (swaggerDef) => {
    const { validateRequest, validateResponse } = init(swaggerDef);
    resolve({ validateRequest, validateResponse });
  });

  instance.on('error', (error) => {
    reject(error);
  });
});

module.exports = validators;

You can check out this also in our example folder.

// index.js
const express = require('express');
const expressJSDocSwagger = require('express-jsdoc-swagger');
const validator = require('./validator');

const options = {
  info: {
    version: '1.0.0',
    title: 'Albums store',
    license: {
      name: 'MIT',
    },
  },
  filesPattern: './**.js',
  baseDir: __dirname,
};

const app = express();
const instance = expressJSDocSwagger(app)(options);

const serverApp = async () => {
  const { validateRequest, validateResponse } = await validator(instance);
  app.use(express.urlencoded({ extended: true }));
  app.use(express.json());
  /**
   * A song
   * @typedef {object} Song
   * @property {string} title.required - The title
   * @property {string} artist - The artist
   * @property {integer} year - The year
   */

  /**
   * POST /api/v1/songs
   * @param {Song} request.body.required - song info
   * @return {object} 200 - song response
   */
  app.post('/api/v1/songs', validateRequest(), (req, res) => res.send('You save a song!'));

  /**
   * POST /api/v1/name
   * @param {string} request.body.required - name body description
   * @return {object} 200 - song response
   */
  app.post('/api/v1/name', (req, res, next) => {
    try {
      // Validate response
      validateResponse('Error string', req);
      return res.send('Hello World!');
    } catch (error) {
      return next(error);
    }
  });

  /**
   * GET /api/v1/authors
   * @summary This is the summary or description of the endpoint
   * @param {string} name.query.required - name param description - enum:type1,type2
   * @param {array<string>} license.query - name param description
   * @return {object} 200 - success response - application/json
   */
  app.get('/api/v1/authors', validateRequest({ headers: false }), (req, res) => (
    res.json([{
      title: 'album 1',
    }])
  ));

  // eslint-disable-next-line no-unused-vars
  app.use((err, req, res, next) => {
    res.status(err.status).json(err);
  });

  return app;
};

const PORT = process.env.PORT || 4000;

serverApp()
  .then(app => 
    app.listen(PORT, () =>
      console.log(`Listening PORT: ${PORT}`)
    ))
  .catch((err) => {
    console.error(err);
    process.exit(1);
  });

You can visit our documentation.