How Can I Efficiently Parse Single JSON Values in Go?

Efficient JSON Single Value Parsing in Go

In Python, accessing a specific value from a JSON object is straightforward, as illustrated in the provided example:

res = res.json()
return res['results'][0] 

However, Go requires a more verbose approach of declaring a struct and unmarshaling the JSON into it:

type Quotes struct {
    AskPrice string `json:"ask_price"`
}

quote := new(Quotes)
errJson := json.Unmarshal(content, &quote)
if errJson != nil {
    return "nil", fmt.Errorf("cannot read json body: %v", errJson)
}

For greater simplicity in Go, consider decoding the JSON into a map[string]interface{} and accessing the desired value by its key:

func main() {
    b := []byte(`{"ask_price":"1.0"}`)
    data := make(map[string]interface{})
    err := json.Unmarshal(b, &data)
    if err != nil {
            panic(err)
    }

    if price, ok := data["ask_price"].(string); ok {
        fmt.Println(price)
    } else {
        panic("wrong type")
    }
}

While maps provide flexibility, structs remain preferable due to their explicit type declarations. They simplify the code by eliminating the need for type assertions.

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