How to specify examples for GET parameters in Swagger?

Question

I'm using the online Swagger Editor to create a Swagger spec for my API.

My API has a single GET request endpoint, and I'm using the following YAML code to describe the input parameters:

paths:
  /fooBar:
    get:
      tags:
        - foobar
      summary: ''
      description: ''
      operationId: foobar
      consumes:
        - application/x-www-form-urlencoded
      produces:
        - application/json
      parameters:
        - name: address
          in: query
          description: Address to be foobared
          required: true
          type: string
          example: 123, FakeStreet
        - name: city
          in: query
          description: City of the Address
          required: true
          type: string
          example: New York

If I put in the example tag, I get an error saying:

is not exactly one from <#/definitions/parameter>,<#/definitions/jsonReference>

How do I set an example when writing GET parameters in Swagger?

Solution

OpenAPI 2.0

OpenAPI/Swagger 2.0 does not have the example keyword for non-body parameters. You can specify examples in the parameter description. Some tools like Swagger UI v2, v3.12+ and Dredd also support the x-example extension property for this purpose:

      parameters:
        - name: address
          in: query
          description: Address to be foobared. Example: `123, FakeStreet`.  # <-----
          required: true
          type: string
          x-example: 123, FakeStreet   # <-----

OpenAPI 3.0

Parameter examples are supported natively in OpenAPI 3.0:

      parameters:
        - name: address
          in: query
          description: Address to be foobared
          required: true
          schema:
            type: string
            example: 123, FakeStreet   # <----
          example: 456, AnotherStreet  # Overrides schema-level example