There's a nice trick you can use to make your map[string]interface{} code a bit easier to write and arguably also to read (less {}s), useful especially when you need e.g. to serialize some deeply nested JSON, for one-off request:

  func doSomeRequest(...) {
      type loose map[string]interface{}
      payload, err := json.Marshal(loose{
          "fooBar": true,
          "nested": loose{
              "subfield": bazArg,
          },
      })
      // ...
  }

I should really probably write some blog listing various tricks like this I'm using, but I still can't make myself do it...