This example demonstrates a simple URL-encoded JSON Pointer in a Swagger 2.0 API definition

json-pointer-example-1.yaml

swagger: "2.0"
info:
  version: 1.0.0
  title: Example

paths:
  "/foo":
    get:
      responses:
        200:
          description: Success
          schema:
            # This line works in Swagger Editor,
            # but the "{" and "}" characters are technically invalid,
            # according to RFC 6901, sections 5 & 6 - https://tools.ietf.org/html/rfc6901#section-5
            # $ref: "#/definitions/foo bar"

            # This line is valid, according to RFC 6901
            # (the space character has been encoded)
            # But, it doesn't work in Swagger Editor
            $ref: "#/definitions/foo%20bar"

definitions:
  foo bar:
    type: string