minor: Audience: add String method

Author: kataras

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2020-2024 Gerasimos Maropoulos <[email protected]>
+Copyright (c) 2020-2025 Gerasimos Maropoulos <[email protected]>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

claims.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"strings"
 	"time"
 )
 
@@ -127,6 +128,11 @@ func (aud *Audience) UnmarshalJSON(data []byte) (err error) {
 	return
 }
 
+// String returns the string representation of the audience.
+func (auth Audience) String() string {
+	return strings.Join(auth, " ")
+}
+
 // ApplyClaims implements the `SignOption` interface.
 // It sets the Audience field to standard Claims instance.
 //