Dev Tools

Swagger Editor — OpenAPI & AsyncAPI Editor

Design, describe, and document OpenAPI and AsyncAPI specs with real-time validation and a live preview. Runs entirely in your browser — nothing you write is ever uploaded.

Related tools

Regex Visualizer — Visual Regular Expression EditorAce Editor Playground — In-Browser Code EditorMonaco Editor Playground — VS Code's Code EditorDrawDB — Database Schema Designer

Was this useful?

Related tools

Regex Visualizer — Visual Regular Expression EditorCode

Visualize, build, and test regular expressions with a railroad-diagram editor.

Ace Editor Playground — In-Browser Code EditorCode

Try the Ace code editor live with syntax highlighting for 45+ languages, 24 themes, and every editor setting.

Monaco Editor Playground — VS Code's Code EditorCode

Try Monaco Editor, the code editor that powers VS Code, with syntax highlighting, IntelliSense, and a live diff view for dozens of languages.

DrawDB — Database Schema DesignerCode

Design and visualize database schemas with an interactive diagram editor, entirely in your browser.

draw.io — Diagram & Flowchart EditorCode

Create flowcharts, UML, ER diagrams, network diagrams, and org charts with a full-featured diagram editor, entirely in your browser.

Mermaid Live Editor — FlowChart & Diagram EditorCode

Write Mermaid markdown-like syntax and see flowcharts, sequence diagrams, ER diagrams, Gantt charts, and more render live.

About Swagger Editor — OpenAPI & AsyncAPI Editor

Swagger Editor is the official open-source editor for designing OpenAPI and AsyncAPI specifications, built by the Swagger/OpenAPI team. Write YAML or JSON and get real-time validation plus a live, rendered documentation preview side-by-side. The build here is self-hosted directly from the swagger-api/swagger-editor project's own source and runs entirely client-side: nothing you write is uploaded to any server by this site.

How to use

  1. Start typing or paste an OpenAPI or AsyncAPI spec into the Monaco-based editor pane.
  2. Watch the live preview pane render your API documentation as you type, with inline validation errors and warnings.
  3. Use File → Download to save your spec as YAML or JSON.

Frequently asked questions

Is my spec uploaded anywhere?
No. Editing, parsing, and validation all happen entirely in your browser — nothing you write is sent to a server by this site.
Does it make any external network calls?
Not automatically. The editor loads with a bundled, local example Petstore spec. That example spec's "Try it out" feature, if you use it, sends a live request to petstore.swagger.io (the example API's own declared server) — that's a request you explicitly trigger, not something the editor does on load.
What spec formats are supported?
OpenAPI 2.0, 3.0, 3.1, and 3.2, and AsyncAPI 2.6 and 3.0, in YAML or JSON.