AsyncAPI Generator
AsyncAPI Generator is free, open-source software that uses an AsyncAPI document and a template to create documentation, code, diagrams, microservices, applic…
What AsyncAPI Generator is
AsyncAPI Generator is free, open-source software that uses an AsyncAPI document and a template to create documentation, code, diagrams, microservices, applications, and other defined outputs. It can produce HTML and Markdown documentation and generate code for Node.js, Java, Python, JavaScript, TypeScript, Go, C#, and PHP. Custom templates or extensions let teams change generated results. The tool can create client libraries that abstract protocol and networking logic for Kafka, WebSocket, MQTT, and other protocols. For providers, it can scaffold server configuration, project structure, connection logic, and stub handlers. Installation options include npm and Docker, while Node.js library use requires Node.js v18.12.0 or higher and npm v8.19.0 or higher. The Generator runs on Linux or in a self-hosted setup. AsyncAPI CLI use in CI/CD is documented, including a GitHub Actions option. Baked-in templates are experimental, limited, and not recommended for production. The project uses Apache License 2.0.
Good
- Free Apache 2.0 open-source project
- Generates documentation, code, and diagrams
- Custom templates change generated output
- Creates Kafka and MQTT client libraries
- Supports CI/CD installation
Watch out
- Baked-in templates are experimental
- Built-in templates are limited
- Production use of baked-in templates is discouraged
- Requires specified Node.js and npm versions
Who it suits
It suits developers and teams maintaining event-driven architectures, including Kafka-based microservices. Linux, self-hosted, npm, Docker, and CI/CD workflows are supported.
Verdict
AsyncAPI Generator turns event-driven API descriptions and templates into documentation, code, scaffolding, and libraries. Its free open-source model is flexible, but teams may need custom templates for production output.
Plans and prices
From AsyncAPI Generator's own pricing page, checked 9 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| AsyncAPI Generator | Free | Apache License 2.0 open-source project |
The facts
Each one read from AsyncAPI Generator's own pages, with the date it was checked.
What it does
- API client libraries
- The Generator can produce client libraries that abstract protocol and networking logic for APIs using Kafka, WebSocket, MQTT, and other protocols.checked 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.checked 9 Oct 2026
- Code generation
- It can generate code in languages including Node.js, Java, and Python.checked 9 Oct 2026
- Documentation output
- It can generate HTML and Markdown documentation from AsyncAPI files.checked 9 Oct 2026
- Extensibility
- Users can create custom templates or extend existing templates to change the output.checked 9 Oct 2026
- Install methods
- The product page lists npm and Docker as installation options.checked 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.checked 9 Oct 2026
- Library use
- The Generator library can be installed in Node.js projects with npm install @asyncapi/generator.checked 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.checked 9 Oct 2026
- Provider boilerplate
- It can scaffold server configuration, project structure, connection logic, and stub handler files for API providers.checked 9 Oct 2026
- Purpose
- The Generator uses an AsyncAPI document and a template to generate documentation, code, diagrams, microservices, applications, and other defined outputs.checked 9 Oct 2026
- Runtime prerequisites
- The installation guide requires Node.js v18.12.0 or higher and npm v8.19.0 or higher.checked 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.checked 9 Oct 2026
- Template limitation
- The docs say baked-in templates are experimental, limited in number, and not recommended for production use.checked 9 Oct 2026
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