AsyncAPI Studio

Free plan ExtensionLinuxMacSelf-hostedWebWindows

What AsyncAPI Studio is

AsyncAPI Studio is a free, open-source tool for developing and maintaining AsyncAPI documents. It lets users write JSON or YAML documents, validate them, convert them to the latest version, preview documentation, and visualize event flows. Studio can import files from remote URLs and resolve relative references against the remote location. For local projects, it can resolve references after access is granted to the folder containing the documents and schemas. Listed referenced schema formats include Avro .avsc, JSON Schema .json, and YAML .yaml. Users can edit the main document and referenced schema files, with changes checked again by the parser. Files opened from a folder can be saved to that location; other files can be exported to a selected local file. It includes a Markdown preview with Mermaid diagrams and an Avro schema viewer that generates Mermaid diagrams. Studio can run in a browser, locally, in Docker, or as a Docker Desktop Extension. The CLI can launch a local instance, downloading about 450 MB on demand; npm must be available on PATH for that installation. Local folder access works in Chrome, Edge, and Brave, but not Firefox or Safari, and must be granted again each session. The application README says the project remains under development and may undergo breaking changes.

Who it suits

AsyncAPI Studio suits people who implement or maintain event-driven architecture, including backend API developers and people maintaining Kafka-based microservice communication. It supports browser and self-hosted workflows, with documented limits on local folder access by browser.

What it does well

Creates, validates, and converts AsyncAPI documents.
Supports JSON, YAML, Avro, and JSON Schema references.
Can import remote files and resolve relative references.
Offers Markdown and Avro viewers with Mermaid diagrams.
Can run locally, in Docker, or as a browser tool.

What to know first

Local folder access is unavailable in Firefox and Safari.
Folder permission must be granted again each session.
CLI installation downloads about 450 MB on demand.
The project may have breaking changes while under development.

Limits

Local folder access requires Chrome, Edge, or Brave and must be granted again each time Studio opens. The application is still under development and may have breaking changes to its API, styling, or features.

Getting started

Open the Studio website at https://studio.asyncapi.com/.
Use Studio on the web, as an extension, or in a self-hosted setup.
Write or import an AsyncAPI document in JSON or YAML.
For local references, grant access to the folder containing the documents and schemas.
To run it locally, use the AsyncAPI CLI command `asyncapi start studio [SPEC-FILE]`.
For CLI installation, make sure npm is available on PATH; Studio downloads on demand at approximately 450 MB.

Verdict

AsyncAPI Studio brings document editing, validation, previews, and event-flow visualization together, with options for browser or self-hosted use. Check its browser restrictions for local folders and the project’s under-development status before adopting it.

Questions

Is AsyncAPI Studio free?

Yes. Its pricing model is free, and it is open source under Apache-2.0.

What document and schema formats does it support?

AsyncAPI documents can be written in JSON or YAML. Listed referenced schema formats are Avro `.avsc`, JSON Schema `.json`, and YAML `.yaml`.

Which platforms can I use?

It is listed for web, Linux, macOS, Windows, extension, and self-hosted use. The project documents local and Docker use, as well as a Docker Desktop Extension.

Can it work with local files and references?

Yes, after granting access to the folder containing the AsyncAPI documents and schemas. Local folder access is supported in Chrome, Edge, and Brave, and permission must be granted again each session.

Can I import documents from a URL?

Yes. Studio can import AsyncAPI files from remote URLs and resolve relative `$ref` references against the remote URL.

Who makes AsyncAPI Studio?

The AsyncAPI Initiative describes itself as an Apache License 2.0 project under the Linux Foundation with an open governance model.

Facts from AsyncAPI Studio's own pages

Additional viewers: Studio includes a Markdown preview with Mermaid diagrams and an Avro schema viewer that generates Mermaid diagrams. · github.com, 4 Oct 2026
Authoring: It lets users develop AsyncAPI documents, validate them, preview documentation, convert documents to the latest version, and visualize event flows. · asyncapi.com, 9 Oct 2026
Browser compatibility: The README says local folder access is supported in Chrome, Edge, and Brave, and is not supported in Firefox or Safari. · github.com, 4 Oct 2026
Browser limits: The documented local folder access feature supports Chrome, Edge, and Brave; it does not support Firefox or Safari. · github.com, 9 Oct 2026
CLI integration: The AsyncAPI CLI can start a local Studio instance with `asyncapi start studio [SPEC-FILE]`. · asyncapi.com, 4 Oct 2026
Document formats: AsyncAPI documents can be written in JSON or YAML. · asyncapi.com, 4 Oct 2026
Download size and prerequisite: The CLI installation guide says Studio is downloaded on demand at approximately 450 MB and that npm must be available on PATH for that installation. · asyncapi.com, 4 Oct 2026
Editing and saving: Studio supports real-time validation across the main document and referenced schemas, and can save opened folder files to their original location. · github.com, 9 Oct 2026
Folder access security: Folder access is granted for the current session and must be granted again each time the application is opened. · github.com, 9 Oct 2026
Intended users: AsyncAPI describes its users as people who implement and maintain event-driven architecture, such as backend API developers and people maintaining Kafka-based microservice communication. · asyncapi.com, 9 Oct 2026
License: The Studio repository is licensed under Apache-2.0. · github.com, 9 Oct 2026
License and governance: The AsyncAPI Initiative describes itself as an Apache License 2.0 project under the Linux Foundation with an open governance model. · asyncapi.com, 4 Oct 2026
Local references: Studio can open a local folder to resolve relative file references, including Avro, JSON Schema, and YAML schema files. · github.com, 9 Oct 2026
Project maturity: The application README says the project is still under development and may have breaking changes to its API, styling, or features. · github.com, 9 Oct 2026
Purpose: Studio is an open-source tool for visually designing AsyncAPI files and event-driven architecture. · github.com, 9 Oct 2026
Remote imports: Studio can import AsyncAPI files from remote URLs and resolve relative $ref references against the remote URL. · github.com, 4 Oct 2026
Remote references: Studio can import AsyncAPI files from remote URLs and resolve relative references using the remote URL as the base path. · github.com, 9 Oct 2026
Saving files: Files opened from a folder can be saved to their original location, while other files can be exported to a selected local file. · github.com, 4 Oct 2026
Schema editing: Studio can edit the main AsyncAPI document and referenced schema files, with changes reflected when the parser re-validates. · github.com, 4 Oct 2026
Schema formats: The README lists Avro .avsc, JSON Schema .json, and YAML .yaml as supported referenced schema formats. · github.com, 4 Oct 2026
Self-hosting: The project documents running Studio locally or using its Docker image, and says it is also available as a Docker Desktop Extension. · github.com, 9 Oct 2026
Viewers: It includes a Markdown preview with Mermaid rendering and an Avro schema viewer that generates Mermaid diagrams. · github.com, 9 Oct 2026

Where AsyncAPI Studio stands on Freedom251

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