Added jsonutil helper

helper/jsonutil/json.go

@@ -0,0 +1,38 @@
+package jsonutil
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io"
+	"reflect"
+)
+
+func EncodeJSON(in interface{}) ([]byte, error) {
+	var buf bytes.Buffer
+	enc := json.NewEncoder(&buf)
+	if err := enc.Encode(in); err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+func DecodeJSON(data []byte, out interface{}) error {
+	// Decoding requires a pointer type to be supplied
+	value := reflect.ValueOf(out)
+	if value.Kind() != reflect.Ptr {
+		return fmt.Errorf("decoding the value into an invalid type: %v", reflect.TypeOf(out))
+	}
+
+	return DecodeJSONFromReader(bytes.NewReader(data), out)
+}
+
+func DecodeJSONFromReader(r io.Reader, out interface{}) error {
+	dec := json.NewDecoder(r)
+
+	// While decoding JSON values, intepret the integer values as numbers instead of floats.
+	dec.UseNumber()
+
+	// Since 'out' is an interface representing a pointer, pass it to the decoder without an '&'
+	return dec.Decode(out)
+}