Adding Basic Authorization for Swagger-UI

Swagger UI 3.x

In Swagger UI 3.13.0+, you can use the preauthorizeBasic method to pre-fill the Basic auth username and password for “try it out” calls.

Assuming your API definition includes a security scheme for Basic auth:

swagger: '2.0'
...
securityDefinitions:
  basicAuth:
    type: basic

security:
  - basicAuth: []

you can specify the default username and password for Basic auth like so:

// index.html

const ui = SwaggerUIBundle({
  url: "https://my.api.com/swagger.yaml",
  ...
  onComplete: function() {
    // "basicAuth" is the key name of the security scheme in securityDefinitions
    ui.preauthorizeBasic("basicAuth", "username", "password");
  }
})

“Try it out” will use the specified username and password, and if you click the “Authorize” button in Swagger UI, you will see that the username and masked password are pre-filled in the UI.

This answer also contains a solution for Swagger UI 3.1.6—3.12.1, which do not have the preauthorizeBasic feature.