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    1.4.1 • Public • Published

    Serverless Auto Swagger

    This plugin allows you to automatically generate a swagger endpoint, describing your application endpoints. This is built from your existing serverless config and typescript definitions, reducing the duplication of work.


    yarn add --dev serverless-auto-swagger
    # or
    npm install -D serverless-auto-swagger

    Add the following plugin to your serverless.yml:

        - serverless-auto-swagger


    This plugin is designed to work with vanilla Serverless Framework. All you need to do is add this plugin to your plugin list and it will generate the swagger file and add the endpoints required. When you deploy your API, your new swagger UI will be available at https://{your-url-domain}/swagger.

    You can also run sls generate-swagger if you want to generate the swagger file without deploying the application.

    Config Options

            generateSwaggerOnDeploy?: true | false
            typefiles?: ['./src/types/typefile1.d.ts', './src/subfolder/helper.d.ts']
            swaggerFiles?: ['./doc/endpointFromPlugin.json', './doc/iCannotPutThisInHttpEvent.json', './doc/aDefinitionWithoutTypescript.json']
            swaggerPath?: 'string'

    generateSwaggerOnDeploy is a boolean which decides whether to generate a new swagger file on deployment. Default is true.

    typefiles is an array of strings which defines where to find the typescript types to use for the request and response bodies. Default is ./src/types/api-types.d.ts.

    swaggerFiles is an array of string which will merge custom json OpenApi 2.0 files to the generated swagger

    swaggerPath is a string for customize swagger path. Default is swagger. Your new swagger UI will be available at https://{your-url-domain}/{swaggerPath}

    Adding more details

    The default swagger file from vanilla Serverless framework will have the correct paths and methods but no details about the requests or responses.

    Adding Data Types

    This plugin uses typescript types to generate the data types for the endpoints. By default it pulls the types from src/types/api-types.d.ts.

    You can then assign these typescript definitions to requests as bodyType on the http or https config, or to the response as seen just below.


    You can also add expected responses to each of the http endpoint events. This is an object that contains the response code with some example details:

    responseData: {
        // response with description and response body
        200: {
            description: 'this went well',
            bodyType: 'helloPostResponse',
        // response with just a description
        400: {
            description: 'failed Post',
        // shorthand for just a description
        502: 'server error',

    Post request expected body

    When you create a POST or PUT endpoint, you expect to receive a specific structure of data as the body of the request.

    You can do that by adding a bodyType to the http event:

    http: {
        path: 'hello',
        method: 'post',
        cors: true,
        bodyType: 'helloPostBody',

    Query String Parameters

    If you want to specify the query string parameters on an endpoint you can do this by adding an object of queryStringParameters to the event (original I know). This has two required properties of required and type as well as an optional description.

    http: {
        path: 'goodbye',
        method: 'get',
        queryStringParameters: {
            bob: {
                required: true,
                type: 'string',
                description: 'bob',
            count: {
                required: false,
                type: 'integer',

    Query String Parameters

    Exclude an endpoint

    You can exclude some endpoints from the swagger generation by adding exclude to the http event:

    http: {
        path: 'hello',
        method: 'post',
        exclude: true,

    with Serverless Offline

    In the plugin list, you must list serverless-auto-swagger before the serverless-offline plugin. If you don't you won't get the required endpoints added to your local endpoints.




    npm i serverless-auto-swagger

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    • samwsoftware