


Unmarshalling Nested JSON Objects as Strings or Byte Arrays
JSON unmarshalling can be customized to handle nested objects in specific ways. In the question, the goal is to parse a JSON object, preserve a nested object as a string or byte array, and avoid automatic field assignment.
To achieve this, the encoding/json package provides the json.RawMessage type. As described in the documentation, json.RawMessage is a raw encoded JSON object that can be used to delay or precompute JSON decoding.
Here's how to use json.RawMessage to handle nested objects in the provided JSON string:
package main import ( "encoding/json" "fmt" ) type Bar struct { ID int64 `json:"id"` Foo json.RawMessage `json:"foo"` } func main() { var bar Bar err := json.Unmarshal([]byte(`{ "id": 15, "foo": { "foo": 123, "bar": "baz" } }`), &bar) if err != nil { panic(err) } fmt.Printf("%+v\n", bar) }
In this case, the foo field of the Bar struct will contain the raw JSON bytes representing the nested object, rather than having it parsed into a Go struct. The output will look like this:
{ID:15 Foo:[123 32 34 102 111 111 34 58 32 49 50 51 44 32 34 98 97 114 34 58 32 34 98 97 122 34 32 125]}
By using json.RawMessage, you can control how nested JSON objects are handled during unmarshalling, allowing for more flexibility in your data processing pipelines.
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