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package jwt
import "encoding/json"
// Audience is a special claim that may either be
// a single string or an array of strings, as per the RFC 7519.
type Audience []string
// MarshalJSON implements a marshaling function for "aud" claim.
func (a Audience) MarshalJSON() ([]byte, error) {
switch len(a) {
case 0:
return json.Marshal("") // nil or empty slice returns an empty string
case 1:
return json.Marshal(a[0])
return json.Marshal([]string(a))
// UnmarshalJSON implements an unmarshaling function for "aud" claim.
func (a *Audience) UnmarshalJSON(b []byte) error {
var (
v interface{}
err error
if err = json.Unmarshal(b, &v); err != nil {
return err
switch vv := v.(type) {
case string:
aud := make(Audience, 1)
aud[0] = vv
*a = aud
case []interface{}:
aud := make(Audience, len(vv))
for i := range vv {
aud[i] = vv[i].(string)
*a = aud
return nil
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