Unmarshal 2 different structs in a slice

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Use a two step process for unmarshaling. First, unmarshal a list of arbitrary JSON, then unmarshal the first and second element of that list into their respective types.

You can implement that logic in a method called UnmarshalJSON, thus implementing the json.Unmarshaler interface. This will give you the compound type you are looking for:

type ParallelData struct {
    UrlData  UrlData
    FormData FormData
}

// UnmarshalJSON implements json.Unmarshaler.
func (p *ParallelData) UnmarshalJSON(b []byte) error {
    var records []json.RawMessage
    if err := json.Unmarshal(b, &records); err != nil {
        return err
    }

    if len(records) < 2 {
        return errors.New("short JSON array")
    }

    if err := json.Unmarshal(records[0], &p.UrlData); err != nil {
        return err
    }

    if err := json.Unmarshal(records[1], &p.FormData); err != nil {
        return err
    }

    return nil
}

Try it on the playground: https://play.golang.org/p/QMn_rbJj-P-

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