How to Decode JSON with Embedded JSON-Encoded Strings?

Decoding JSON with Embedded JSON-Encoded Strings

In the context of parsing a complex JSON response from an external API, a problem arises due to the presence of JSON-encoded strings within the JSON object. The JSON structure contains a field called "text" that includes an HTML string. Upon attempting to decode this JSON using a custom type, an error is encountered.

To address this issue, a two-step decoding process is necessary:

1. Parse the main JSON structure into a simplified type that includes the "args" field as a slice of strings.
2. Decode each string in the "args" slice as a new JSON object using a custom type that accommodates the "text" field.

type main struct {
  Name string   `json:"name"`
  Args []string `json:"args"`
}

type arg struct {
  Method string `json:"method"`
  Params par    `json:"params"`
}
type par struct {
  Channel   string `json:"channel,omitempty"`
  Name      string `json:"name,omitempty"`
  NameColor string `json:"nameColor,omitempty"`
  Text      string `json:"text,omitempty"`
  Time      int64  `json:"time,omitempty"`
}

An example of decoding the provided JSON string:

str := `{"name":"message","args":["{\"method\":\"chatMsg\",\"params\":{\"channel\":\"channel\",\"name\":\"name\",\"nameColor\":\"B5B11E\",\"text\":\"<a href=\\"https://play.spotify.com/browse\\" target=\\"_blank\\">https://play.spotify.com/browse</a>\",\"time\":1455397119}}"]}`

var m main
if err := json.Unmarshal([]byte(str), &amp;m); err != nil {
    log.Fatal(err)
}

var args arg
if err := json.Unmarshal([]byte(m.Args[0]), &amp;args); err != nil {
    log.Fatal(err)
}

By separating the decoding of the outer JSON object and the embedded JSON string, it becomes possible to handle the nested JSON structure correctly, resolving the invalid character error.

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