Decoding JSON data from bytes changing float value to int-CodePudding

The following code to un-marshall json data from from byte array changing the type of float value to int.

package main

import (
    "encoding/json"
    "fmt"
)

func main() {
    byt := []byte(`{"num":6.0}`)
    var dat map[string]interface{}
    fmt.Println(byt)

    if err := json.Unmarshal(byt, &dat); err != nil {
        panic(err)
    }
    fmt.Println(dat)
}

Here is the playground link: https://go.dev/play/p/60YNkhIUABU

Is there anyway to keep the type as it is?

CodePudding user response：

The unmarshalled number already is a float64. You can check this by adding a line to the end of your playground example to print out the type of the data:

fmt.Printf("%T\n", dat["num"])

If you want to have this be more explicit, you could try changing the type of dat from map[string]interface{} to map[string]float64.