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AsyncAPI Generator
What AsyncAPI Generator is
AsyncAPI Generator uses an AsyncAPI document and a template to create outputs such as documentation, code, diagrams, microservices, and applications. It can produce HTML or Markdown documentation and code for languages including Node.js, Java, and Python. Templates shape the generated output, and users can create their own or extend existing ones. The tool can also produce client libraries that abstract protocol and networking details for APIs using Kafka, WebSocket, MQTT, and other protocols. For API providers, it can scaffold server configuration, project structure, connection logic, and stub handler files. Installation options include npm and Docker, and the library can be added to Node.js projects. Its installation guide requires Node.js v18.12.0 or higher and npm v8.19.0 or higher. The AsyncAPI CLI can be installed in CI/CD pipelines, with a GitHub Actions option for the Generator. The tool is free, open-source software under Apache License 2.0. Baked-in templates are experimental, limited in number, and not recommended for production use.
Who it suits
It suits backend API developers and teams maintaining event-driven systems, including Kafka-based microservice communication. Teams can use custom templates, but should account for the stated limitations of the built-in templates.
What it does well
- Generates documentation, code, diagrams, and other defined outputs.
- Supports custom templates and extensions to existing templates.
- Can scaffold API provider project structure and handler files.
- Offers npm and Docker installation options.
- Can be integrated into CI/CD pipelines.
What to know first
- Baked-in templates are experimental and limited in number.
- Built-in templates are not recommended for production use.
- Requires Node.js v18.12.0 or higher and npm v8.19.0 or higher.
Limits
The baked-in templates are experimental, limited in number, and not recommended for production use. Node.js library installation requires Node.js v18.12.0 or higher and npm v8.19.0 or higher.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| AsyncAPI Generator | Apache License 2.0 open-source project | Free |
As asyncapi.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the AsyncAPI Generator page at https://www.asyncapi.com/tools/generator.
- Choose npm or Docker as an installation route.
- For use as a Node.js library, install @asyncapi/generator with npm.
- For Node.js library use, meet the Node.js v18.12.0 and npm v8.19.0 minimum versions.
- Provide an AsyncAPI document and a template as inputs.
- For CI/CD use, install the AsyncAPI CLI in a pipeline or use the GitHub Actions option.
Verdict
AsyncAPI Generator offers a free way to create API-related documentation and code from documents and templates, with scope shaped by the selected template. Its built-in templates carry a production-use caveat, so teams may need to create or extend templates.
Questions
Is AsyncAPI Generator free?
Yes. It is listed as free and open source, under Apache License 2.0.
What can it generate?
It can generate documentation, code, diagrams, microservices, applications, and other template-defined outputs. Listed formats include HTML, Markdown, and PDF.
Which programming languages are supported?
The listed languages are JavaScript, Java, Python, TypeScript, Go, C#, and PHP. Code generation examples also include Node.js.
How can it be installed?
The product page lists npm and Docker. The Generator library can be installed in Node.js projects with npm install @asyncapi/generator.
What are the Node.js requirements?
The installation guide requires Node.js v18.12.0 or higher and npm v8.19.0 or higher for the library route.
Where can users get project support?
The project directs users to Slack for community contact and to GitHub issues and pull requests for bugs, feature requests, and fixes.
Facts from AsyncAPI Generator's own pages
- API client libraries
- The Generator can produce client libraries that abstract protocol and networking logic for APIs using Kafka, WebSocket, MQTT, and other protocols. · asyncapi.com, 9 Oct 2026
- CI/CD integration
- The docs say the AsyncAPI CLI can be installed in a CI/CD pipeline and point to a GitHub Actions option for the Generator. · asyncapi.com, 9 Oct 2026
- Code generation
- It can generate code in languages including Node.js, Java, and Python. · asyncapi.com, 9 Oct 2026
- Documentation output
- It can generate HTML and Markdown documentation from AsyncAPI files. · asyncapi.com, 9 Oct 2026
- Extensibility
- Users can create custom templates or extend existing templates to change the output. · asyncapi.com, 9 Oct 2026
- Install methods
- The product page lists npm and Docker as installation options. · asyncapi.com, 9 Oct 2026
- Intended users
- The project describes AsyncAPI users as people who implement and maintain event-driven architectures, including backend API developers and teams maintaining Kafka-based microservice communication. · asyncapi.com, 9 Oct 2026
- Library use
- The Generator library can be installed in Node.js projects with npm install @asyncapi/generator. · asyncapi.com, 9 Oct 2026
- License and governance
- The AsyncAPI Initiative describes its tools as free open-source software under the Linux Foundation and says projects under the Initiative use the Apache 2.0 license. · asyncapi.com, 9 Oct 2026
- Provider boilerplate
- It can scaffold server configuration, project structure, connection logic, and stub handler files for API providers. · asyncapi.com, 9 Oct 2026
- Purpose
- The Generator uses an AsyncAPI document and a template to generate documentation, code, diagrams, microservices, applications, and other defined outputs. · asyncapi.com, 9 Oct 2026
- Runtime prerequisites
- The installation guide requires Node.js v18.12.0 or higher and npm v8.19.0 or higher. · asyncapi.com, 9 Oct 2026
- Support channels
- The project directs users to Slack for community contact and GitHub issues and pull requests for bugs, feature requests, and fixes. · asyncapi.com, 9 Oct 2026
- Template limitation
- The docs say baked-in templates are experimental, limited in number, and not recommended for production use. · asyncapi.com, 9 Oct 2026
Where AsyncAPI Generator stands on Freedom251
- Documentation Generators#5 of 37
- Api Docs#5 of 19