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I'm getting an error of:
json.Unmarshal undefined (type interface {} has no field or method Unmarshal)
trying to convert a json byte slice into the generic interface{} type. I'm reading the docs for encoding/json and they give an example that shows this is valid. What gives?
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
)
func main() {
var json interface{}
data, _ := ioutil.ReadFile("testMusic.json")
json.Unmarshal(data, &json)
m := json.(map[string]interface{})
fmt.Printf("%+v", m)
}
887
To unmarshal a JSON array into a slice, Unmarshal resets the slice length to zero and then appends each element to the slice. As a special case, to unmarshal an empty JSON array into a slice, Unmarshal replaces the slice with a new empty slice.
Unmarshal will return an error when the input is not valid JSON (like, change false to hello , or remove the close brace).
To parse JSON, we use the Unmarshal() function in package encoding/json to unpack or decode the data from JSON to a struct. Unmarshal parses the JSON-encoded data and stores the result in the value pointed to by v. Note: If v is nil or not a pointer, Unmarshal returns an InvalidUnmarshalError.
NewDecoder() is designed to decode streams of JSON objects and considers a request body like '{"Name": "Bob"}{"Name": "Carol": "Age": 54}' or '{"Name": "Dave"}{}' to be valid. But in the code above only the first JSON object in the request body will actually be parsed.
You've defined a local variable json that masks the global symbol json referring to the JSON module. Renaming your local variable should allow your code to work.
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