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    This package has been deprecated

    Author message:

    fastify-swaggergen is no longer supported, please switch to fastify-openapi-glue


    1.1.6 • Public • Published

    Fastify swagger generator

    CI status

    A plugin for fastify to autogenerate a configuration based on a OpenApi(v2/v3) specification.

    This project has been replaced by Fastify OpenApi Glue


    npm i fastify-swaggergen --save



    Add the plugin to your project with register and pass it some basic options and you are done !

    const swaggerGen = require("fastify-swaggergen");
    const options = {
      swaggerSpec: `${__dirname}/petstore-swagger.v2.json`,
      service: `${__dirname}/service.js`,
      fastifySwagger: {
        disabled: false
    fastify.register(swaggerGen, options);

    All schema and routes will be taken from the OpenApi specification listed in the options. No need to specify them in your code.


    • swaggerSpec: this can be a JSON object, or the name of a JSON or YAML file containing a valid OpenApi(v2/v3) file
    • service: this can be a javascript object or class, or the name of a javascript file containing such an object. If the import of the file results in a function instead of an object then the function will be executed during import.
    • fastifySwagger: an object containing the options for the fastify-swagger plugin. To avoid registering this plugin pass { fastifySwagger: { disabled: true }}

    Of these options swaggerSpec and service are mandatory, fastifySwagger is optional.

    See the examples section for a demo.


    To make life even more easy there is the swaggergen cli. The swaggergen cli takes a valid OpenApi (v2/v3) file (JSON or YAML) and generates a project including a fastify flugin that you can use on any fastify server, a stub of the service class and a skeleton of a test harness to test the plugin.


      swaggergen [options] <OpenApi specification>

    or if you don't have swaggergen installed:

      npx github:seriousme/fastify-swaggergen <OpenApi specification>

    This will generate a project based on the provided OpenApi specification. Any existing files in the project folder will be overwritten! See the generator examples section for a demo.


      -p <name>                   The name of the project to generate
      --projectName=<name>        [default: generatedProject]
      -b <dir> --baseDir=<dir>    Directory to generate the project in.
                                  This directory must already exist.
                                  [default: "."]
    The following options are only usefull for testing the swaggergen plugin:
      -c --checksumOnly           Don't generate the project on disk but
                                  return checksums only.
      -l --localPlugin            Use a local path to the plugin.

    See the generator example section for a demo.


    Clone this repository and run npm i


    Executing npm start will start fastify on localhost port 3000 with the routes extracted from the petstore example and the accompanying service definition

      "statusCode": 400,
      "error": "Bad Request",
      "message": "params.petId should be integer"
      "statusCode": 500,
      "error": "Internal Server Error",
      "message": "Operation findPetsByStatus not implemented"
      "statusCode": 500,
      "error": "Internal Server Error",
      "message": "name is required!"

    as the pet returned by service.js does not match the response schema.


    The folder examples/generatedProject contains the result of running swaggergen -l --baseDir=examples examples/petstore/petstore-swagger.v2.yaml. The generated code can be started using npm start in examples/generatedProject (you will need to run npm i in the generated folder first)


    Licensed under MIT


    npm i fastify-swaggergen

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    • seriousme