Go to JSON type mappings
suggest changeMapping between Go types and JSON types:
JSON type | Go type |
---|---|
null | nil |
boolean | bool |
number | float64 or int |
string | string |
array | slice |
dictionary | map[struct]interface{} or struct |
Here’s how they look in practice:
func printSerialized(v interface{}, w io.Writer) {
d, err := json.Marshal(v)
if err != nil {
log.Fatalf("json.Marshal failed with '%s'\n", err)
}
fmt.Fprintf(w, "%T\t%s\n", v, string(d))
}
w := new(tabwriter.Writer)
w.Init(os.Stdout, 5, 0, 1, ' ', 0)
fmt.Fprint(w, "Go type:\tJSON value:\n")
fmt.Fprint(w, "\t\n")
printSerialized(nil, w)
printSerialized(5, w)
printSerialized(8.23, w)
printSerialized("john", w)
ai := []int{5, 4, 18}
printSerialized(ai, w)
a := []interface{}{4, "string"}
printSerialized(a, w)
d := map[string]interface{}{
"i": 5,
"s": "foo",
}
printSerialized(d, w)
s := struct {
Name string
Age int
}{
Name: "John",
Age: 37,
}
printSerialized(s, w)
w.Flush()
Go type: JSON value:
<nil> null
int 5
float64 8.23
string "john"
[]int [5,4,18]
[]interface {} [4,"string"]
map[string]interface {} {"i":5,"s":"foo"}
struct { Name string; Age int } {"Name":"John","Age":37}
Found a mistake? Have a question or improvement idea?
Let me know.
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