Welcome to next-swagger-doc 👋

Generate Swagger JSON API from NextJS Api Routes

_{If you enjoy working with next-swagger-doc, you will love next-validations: NextJS API Validations, support Zod, Yup, Fastest-Validator, Joi, and more}

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✨ Demo

Prerequisites

nextjs >= 9

Motivation

This package reads your JSDoc-annotated source code on NextJS API route and generates an OpenAPI (Swagger) specification.

nextjs + swagger-jsdoc = next-swagger-doc

Install

yarn add next-swagger-doc

Usage #1: Create an single API document

yarn add next-swagger-doc swagger-ui-react

Create an live swagger page, e.g: pages/api-doc.tsx

import { GetStaticProps, InferGetStaticPropsType } from 'next';
import { createSwaggerSpec } from 'next-swagger-doc';
import dynamic from 'next/dynamic';
import 'swagger-ui-react/swagger-ui.css';

const SwaggerUI = dynamic<{
  spec: any;
}>(import('swagger-ui-react'), { ssr: false });

function ApiDoc({ spec }: InferGetStaticPropsType<typeof getStaticProps>) {
  return <SwaggerUI spec={spec} />;
}

export const getStaticProps: GetStaticProps = async () => {
  const spec: Record<string, any> = createSwaggerSpec({
    definition: {
      openapi: '3.0.0',
      info: {
        title: 'Next Swagger API Example',
        version: '1.0',
      },
    },
  });

  return {
    props: {
      spec,
    },
  };
};

export default ApiDoc;

Usage #2: Use NextJS API route to create Swagger JSON spec

Step 1: Create an api route on nextjs, e.g: pages/api/doc.ts

import { withSwagger } from 'next-swagger-doc';

const swaggerHandler = withSwagger({
  definition: {
    openapi: '3.0.0',
    info: {
      title: 'NextJS Swagger',
      version: '0.1.0',
    },
  },
  apiFolder: 'pages/api',
});
export default swaggerHandler();

Step 2: Add JSdoc to any NextJS API routes, for example: pages/api/hello.ts

import { NextApiRequest, NextApiResponse } from 'next';

/**
 * @swagger
 * /api/hello:
 *   get:
 *     description: Returns the hello world
 *     responses:
 *       200:
 *         description: hello world
 */
const handler = (_req: NextApiRequest, res: NextApiResponse) => {
  res.status(200).json({
    result: 'hello world',
  });
};

export default handler;

Step 3: Access the Swagger API doc

Usage 3: Generate Swagger file from CLI

Step 1: create a JSON config file as next-swagger-doc.json

{
  "apiFolder": "pages/api",
  "schemaFolders": ["models"],
  "definition": {
    "openapi": "3.0.0",
    "info": {
      "title": "Next Swagger API Example",
      "version": "1.0"
    }
  }
}

Step 2: run cli for generating swagger file

yarn next-swagger-doc-cli next-swagger-doc.json

Run example app

gh repo clone jellydn/next-swagger-doc
cd example
yarn install
yarn dev

Then open http://localhost:3000/api-doc or http://localhost:3000/ on your browser

Linter

In order to set an eslint rule that checks that all the APIs actually have a swagger JsDoc description we can use the following settings:

Install the JsDoc eslint plugin:

yarn add -D eslint-plugin-jsdoc

Create the custom rule in your eslint configuration file:

{
    //...your configuration
    "overrides": [
        //...your overrides
        {
            // Force the setting of a swagger description on each api endpoint
            "files": ["pages/api/**/*.ts"],
            "plugins": ["jsdoc"],
            "rules": {
                "jsdoc/no-missing-syntax": [
                "error",
                {
                    "contexts": [
                    {
                        "comment": "JsdocBlock:has(JsdocTag[tag=swagger])",
                        "context": "any",
                        "message": "@swagger documentation is required on each API. Check this out for syntax info: https://github.com/jellydn/next-swagger-doc"
                    }
                    ]
                }
            ]
        }
    ]
}

Author

👤 Huynh Duc Dung

Website: https://productsway.com/
Twitter: @jellydn
Github: @jellydn

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Contributors ✨

Thanks goes to these wonderful people (emoji key):

_{Dung Duc Huynh (Kaka)} 💻 📖	_tmirkovic 📖	_{Matthew Holloway} 💻	_{leventemihaly} 📖	_{PAHRIZAL MA'RUP} 💻	_Aris 📖	_{Valerio Ageno} 📖
_cachho 💻