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Swagger Viewer - v3.1.2

Swagger Viewer lets you preview Swagger 2.0 and OpenAPI files as you type in Visual Studio Code. Additionally provide intellisense/linting for the files as well.

It works on swagger files in json and yaml format. Preview happens in real time as you type.


To start

  • Open the swagger file and press F1.
  • Run the Command Preview Swagger.


  • Press Shift + Alt + P


  • Right click file in explorer panel and click Preview Swagger


  • Preview it in vscode Itself like this

Swagger Preview

Swagger Context Menu


Swagger Settings

Opening In External browser

If you want to preview the changes in external browser change the settings Preview In Browser to true in User/Workspace Settings


  • Run the Command Preview Swagger.


  • Press Shift + Alt + P

Preview will be automatically opened in default browser.

Change Default Port

Default port of the preview url can be changed by changing the Default Port value in User/Workspace Settings

Show Only File Name

In the preview title the file name along with the full path is displayed by default. It can be changed to show only the file name by changing the Show Only File Name to true in User/Workspace Settings

Change Default Host

Default host(localhost) of the preview url can be changed by changing the swaggerViewer.defaultHost value in User/Workspace Settings

Stop Swagger Viewer Preview Server

To stop the preview server simply click the status bar item.

Stop Swagger Server


v3.0.0 Changes

  • The primary functionality of the Swagger Viewer extension would be the ability to preview Swagger and OpenAPI files.
  • Swagger Viewer will just use the json schema of Swagger and OpenAPI to provide intellisense and linting. Recommend using teh extension OpenAPI (Swagger) Editor for full editing capabilities.
  • Intellisense for Swagger 2.0 and OpenAPI 3.0 is available now. Added extension YAML as extensionDependencies for supporting YAML intellisense.
  • Default port changed to 18512
  • Upgraded swagger-ui to version 3.25.2
  • Start preview server in next available port for preview if configured port is not available
  • Fix for custom host config
  • Ability to stop the preview server

v2.2.2 Changes

v2.2.1 Changes

  • Fixed the external refs issue #45

Known Issue

  • Validator still gives a warning on relative paths. Will be fixed in next version.

v2.2.0 Changes

  • Support to configure default preview host (instead of localhost) - By @beastoin #41

v2.1.0 Changes

  • Replaced the deprecated vscode.previewHtml with Webview - #50
  • Added configuration option to show only file name in title
  • Added support for OpenAPI 3.0.3 validation - By @ackintosh #49

v2.0.2 Changes

  • Fixed issues with parsing yaml due in yamljs library. Changed to js-yaml library.
  • Fixed issue where validation errors are not cleared in yaml file.

v2.0.0 Changes

  • Code base changed to TypeScript
  • Partial validation support added
  • OpenAPI Support added (Not fully tested)
  • Only one server runs for the preview page
  • Multiple files can be previewed at a time inside vscode
  • Context menu added to the explorer to start the preview directly without opening the file
  • Using files from swagger-ui-dist npm package - By @Raptor399 #36
  • Multiple minor bug fixes

v1.7.0 Changes

  • Fixed issue in json file parsing. - By @Zlass #27

v1.6.0 Changes

  • Added support for .yaml, .yml, .json and unsaved documents. - By @DW8Reaper #21

v1.5.0 Changes

  • Upgraded Swagger UI v3 for preview. - By @jienco #17

v1.4.0 Changes

  • Fixed - Preview of JSON Swagger files not getting updated in realtime. - By @tmsns
  • Fixed - Preview window in vs code not switching to latest file.
  • Added - File name in preview window to identify which file is in preview.
  • Some performance fixes

v1.3.0 Changes

  • Added - Now preview swagger inside the editor itself. - By @ferreus #7
  • Added - Preview inside editor by default

v1.2.0 Changes

  • Added - Open button in message box. - By @pmentz #3
  • Added - shortcut Shift + Alt + P to run the command
  • Added - Ability to change default port from User/Workspace Settings.


Swagger Viewer utilizes the following open source projects



Swagger Viewer lets you preview and validate Swagger 2.0 and OpenAPI files as you type in Visual Studio Code.








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