1.9.12 • Public • Published

    AsyncAPI Generator

    npm npm

    ⚠️ This package doesn't support AsyncAPI 1.x anymore. We recommend to upgrade to the latest AsyncAPI version using the AsyncAPI converter. If you need to convert documents on the fly, you may use the Node.js or Go converters.


    Generator is a tool that you can use to generate whatever you want basing on the AsyncAPI specification file as an input.

    To specify what exactly must be generated you create so called template. To create your own template, go to section that explains How to create a template.

    There is a large number of templates that are ready to use and are officially supported by the AsyncAPI Initiative.

    List of official generator templates

    Template Name Description Source code
    @asyncapi/nodejs-template Generates Nodejs service that uses Hermes package click here
    @asyncapi/nodejs-ws-template Generates Nodejs service that supports WebSockets protocol only click here
    @asyncapi/java-template Generates Java JMS application click here
    @asyncapi/java-spring-template Generates Java Spring service click here
    @asyncapi/java-spring-cloud-stream-template Generates Java Spring Cloud Stream service click here
    @asyncapi/python-paho-template Generates Python service that uses Paho library click here
    @asyncapi/html-template Generates HTML documentation site click here
    @asyncapi/markdown-template Generates documentation in Markdown file click here
    @asyncapi/ts-nats-template Generates TypeScript NATS client click here
    @asyncapi/go-watermill-template Generates Go client using Watermill click here
    @asyncapi/dotnet-nats-template Generates .NET C# client using NATS click here

    You can find above templates and the ones provided by the community in this list


    • Node.js v12.16 and higher
    • npm v6.13.7 and higher

    Install both packages using official installer. After installation make sure both packages have proper version by running node -v and npm -v. To upgrade invalid npm version run npm install npm@latest -g

    Generator is tested at the moment against Node 14 and NPM 6. Using newer versions is enabled but we do not guarantee they work well. Please provide feedback on the issues.

    Using from the command-line interface (CLI)

    Install the CLI

    To use it as CLI, install generator globally:

    npm install -g @asyncapi/generator

    Update the CLI

    You might want to update your local installation of generator for different reasons:

    • You want the latest generator to have its latest features. Perform usual installation and in case you had generator installed already, it will upgrade to latest available:
      npm install -g @asyncapi/generator
    • You want a specific version of the generator because your template might not be compatible with the latest generator. Check what version you need and perform installation, specifying the exact version with the @ character:
      npm install -g @asyncapi/generator@0.50.0

    Sometimes you have to force additional npm installation like this: npm install -g --force @asyncapi/generator

    CLI usage

    Usage: ag [options] <asyncapi> <template>
    - <asyncapi>: Local path or URL pointing to AsyncAPI specification file
    - <template>: Name of the generator template like for example @asyncapi/html-template or https://github.com/asyncapi/html-template
      -V, --version                  output the version number
      -d, --disable-hook [hooks...]  disable a specific hook type or hooks from given hook type
      --debug                        enable more specific errors in the console
      -i, --install                  installs the template and its dependencies (defaults to false)
      -n, --no-overwrite <glob>      glob or path of the file(s) to skip when regenerating
      -o, --output <outputDir>       directory where to put the generated files (defaults to current directory)
      -p, --param <name=value>       additional param to pass to templates
      --force-write                  force writing of the generated files to given directory even if it is a git repo with unstaged files or not empty dir (defaults to false)
      --watch-template               watches the template directory and the AsyncAPI document, and re-generate the files when changes occur. Ignores the output directory. This flag should be used only for template development.
      --map-base-url <url:folder>    maps all schema references from base url to local folder
      -h, --help                     display help for command
    Click here to read more about supported values for the <template> parameter.
    Templates are installable npm packages. Therefore, the value of <template> can be anything supported by npm install. Here's a summary of the possibilities:

      npm install [<@scope>/]<name>
      npm install [<@scope>/]<name>@<tag>
      npm install [<@scope>/]<name>@<version>
      npm install [<@scope>/]<name>@<version range>
      npm install <git-host>:<git-user>/<repo-name>
      npm install <git repo url>
      npm install <tarball file>
      npm install <tarball url>
      npm install <folder>

    Global templates installed with yarn or npm

    You can preinstall templates globally. The generator first tries to locate template in local dependencies and then in location where global packages are installed.

    npm install -g @asyncapi/html-template@0.16.0
    ag asyncapi.yaml @asyncapi/html-template
    # The generator uses template in version 0.16.0 and not latest

    CLI usage examples

    The shortest possible syntax:

    ag asyncapi.yaml @asyncapi/html-template

    Generating from a URL:

    ag https://bit.ly/asyncapi @asyncapi/html-template

    Specify where to put the result:

    ag asyncapi.yaml @asyncapi/html-template -o ./docs

    Passing parameters to templates:

    ag asyncapi.yaml @asyncapi/html-template -o ./docs -p title='Hello from param'

    In the template you can use it like this: {{ params.title }}

    Disabling the hooks:

    ag asyncapi.yaml @asyncapi/html-template -o ./docs -d generate:before generate:after=foo,bar

    The generator skips all hooks of the generate:before type and foo, bar hooks of the generate:after type.

    Installing the template from a folder:

    ag asyncapi.yaml ~/my-template

    It creates a symbolic link to the target directory (~/my-template in this case).

    Installing the template from a git URL:

    ag asyncapi.yaml https://github.com/asyncapi/html-template.git

    Map schema references from baseUrl to local folder:

    ag test/docs/apiwithref.json @asyncapi/html-template -o ./build/ --force-write --map-base-url https://schema.example.com/crm/:./test/docs/

    The parameter --map-base-url maps external schema references to local folders.

    CLI usage with Docker

    Install Docker first. Thanks to Docker you do not need Node.js even though the generator is written with it.

    docker run --rm -it \
    -v [ASYNCAPI SPEC FILE LOCATION]:/app/asyncapi.yml \
    -v [GENERATED FILES LOCATION]:/app/output \
    asyncapi/generator [COMMAND HERE]
    # Example that you can run inside generator directory after cloning this repository. First you specify mount in location of your AsyncAPI specification file and then you mount in directory where generation result should be saved.
    docker run --rm -it \
    -v ${PWD}/test/docs/dummy.yml:/app/asyncapi.yml \
    -v ${PWD}/output:/app/output \
    asyncapi/generator -o /app/output /app/asyncapi.yml @asyncapi/html-template --force-write

    CLI usage with npx instead of npm

    The npx is very useful when you want to run Generator in CI/CD environment. In such a scenario, you do not want to install generator globally and most environments that provide Node.js and npm, also provide npx out of the box.

    npx -p @asyncapi/generator ag ./asyncapi.yaml @asyncapi/html-template

    Using as a module/package

    Install the module

    npm install @asyncapi/generator --save

    Example using the module

    Below you can find an example of HTML generation using official @asyncapi/html-template template and fetching the spec document from server like https://raw.githubusercontent.com/asyncapi/asyncapi/2.0.0/examples/2.0.0/streetlights.yml :

    const path = require('path');
    const generator = new Generator('@asyncapi/html-template', path.resolve(__dirname, 'example'));
    try {
      await generator.generateFromURL('https://raw.githubusercontent.com/asyncapi/asyncapi/2.0.0/examples/2.0.0/streetlights.yml');
    } catch (e) {

    See API documentation for more example and full API reference information.

    Generator version vs Template version

    The Generator is a tool that you can use to generate whatever you want, taking an AsyncAPI specification file as the input. A template is a tool that uses Generator features and helpers to specify what should be generated.

    In other words, a template depends on the Generator and its features. For example, it might work with the latest version of the Generator but not the previous ones.

    The owner of the template specifies in the configuration what version of the Generator it is compatible with:

    "generator": ">=0.50.0 <2.0.0",

    The Generator doesn't work in case the template is not compatible:

    Something went wrong:
    Error: This template is not compatible with the current version of the generator (0.50.0). This template is compatible with the following version range: >=0.60.0 <2.0.0.
        at Generator.validateTemplateConfig (/Users/wookiee/.nvm/versions/node/v12.16.1/lib/node_modules/@asyncapi/generator/lib/generator.js:678:13)
        at Generator.loadTemplateConfig (/Users/wookiee/.nvm/versions/node/v12.16.1/lib/node_modules/@asyncapi/generator/lib/generator.js:663:16)
        at Generator.generate (/Users/wookiee/.nvm/versions/node/v12.16.1/lib/node_modules/@asyncapi/generator/lib/generator.js:146:18)
        at processTicksAndRejections (internal/process/task_queues.js:97:5)
        at async /Users/wookiee/.nvm/versions/node/v12.16.1/lib/node_modules/@asyncapi/generator/cli.js:135:7

    In case you use Generator CLI and a specific template on production, it is safer to lock to a specific version of the template and the Generator.

    Instead of generating HTML with latest html-template and the generator CLI:

    npm install -g @asyncapi/generator
    ag asyncapi.yaml @asyncapi/html-template -o ./docs

    Generate HTML with the version of the html-template and the Generator CLI that you are happy with:

    npm install -g @asyncapi/generator@0.50.0
    ag asyncapi.yaml @asyncapi/html-template@0.7.0 -o ./docs

    Before using newer versions of the template, always look at the changelog first. Generator features are not important for you, just make sure to use a version compatible with the template.

    How to create a template

    To create your own template, for example code generator for some specific language and technology, learn from the following resources:


    Read CONTRIBUTING guide.


    Thanks goes to these wonderful people (emoji key):

    Fran Méndez

    💬 🐛 💻 📖 🤔 🚧 🔌 👀 ⚠️

    Jonas Lagoni

    💬 🐛 💻 📖 🤔 🔌 👀 ⚠️

    Lukasz Gornicki

    💬 🐛 📝 💻 📖 🤔 🚧 🔌 👀 ⚠️ 🚇

    Travis Reeder

    🚇 📖


    🐛 💻 📖 🤔 🔌 👀 ⚠️

    Waleed Ashraf

    💻 🐛



    Derk Muenchhausen


    Ben Timby


    Amanda Shafack


    This project follows the all-contributors specification. Contributions of any kind welcome!


    npm i @asyncapi/generator

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