diff --git a/include/sudo_json.h b/include/sudo_json.h
index 4ac7bc6d9..417d61b7d 100644
--- a/include/sudo_json.h
+++ b/include/sudo_json.h
@@ -37,7 +37,6 @@ struct json_value {
     enum json_value_type type;
     union {
 	const char *string;
-	char * const * array;
 	long long number;
 	id_t id;
 	bool boolean;
diff --git a/lib/iolog/iolog_fileio.c b/lib/iolog/iolog_fileio.c
index a1985d4a2..064ebc419 100644
--- a/lib/iolog/iolog_fileio.c
+++ b/lib/iolog/iolog_fileio.c
@@ -932,6 +932,8 @@ iolog_write_info_file_json(int dfd, const char *parent, struct iolog_info *info)
     bool ret = false;
     FILE *fp = NULL;
     int fd = -1;
+    size_t i;
+    char *cp;
     debug_decl(iolog_write_info_file_json, SUDO_DEBUG_UTIL);
 
     if (info->cmd == NULL || info->user == NULL || info->runas_user == NULL)
@@ -974,16 +976,28 @@ iolog_write_info_file_json(int dfd, const char *parent, struct iolog_info *info)
         goto oom;
 
     if (info->argv != NULL) {
-	json_value.type = JSON_ARRAY;
-	json_value.u.array = info->argv;
-	if (!sudo_json_add_value(&json, "runargv", &json_value))
+	if (!sudo_json_open_array(&json, "runargv"))
+	    goto oom;
+	for (i = 0; (cp = info->argv[i]) != NULL; i++) {
+	    json_value.type = JSON_STRING;
+	    json_value.u.string = cp;
+	    if (!sudo_json_add_value(&json, NULL, &json_value))
+		goto oom;
+	}
+	if (!sudo_json_close_array(&json))
 	    goto oom;
     }
 
     if (info->envp != NULL) {
-	json_value.type = JSON_ARRAY;
-	json_value.u.array = info->envp;
-	if (!sudo_json_add_value(&json, "runenv", &json_value))
+	if (!sudo_json_open_array(&json, "runenv"))
+	    goto oom;
+	for (i = 0; (cp = info->envp[i]) != NULL; i++) {
+	    json_value.type = JSON_STRING;
+	    json_value.u.string = cp;
+	    if (!sudo_json_add_value(&json, NULL, &json_value))
+		goto oom;
+	}
+	if (!sudo_json_close_array(&json))
 	    goto oom;
     }
 
diff --git a/lib/util/json.c b/lib/util/json.c
index 6a12d0a62..1bc46572b 100644
--- a/lib/util/json.c
+++ b/lib/util/json.c
@@ -305,7 +305,6 @@ sudo_json_add_value_int(struct json_container *json, const char *name,
     struct json_value *value, bool as_object)
 {
     char numbuf[(((sizeof(long long) * 8) + 2) / 3) + 2];
-    unsigned int i;
     debug_decl(sudo_json_add_value, SUDO_DEBUG_UTIL);
 
     /* Add comma if we are continuing an object/array. */
@@ -356,41 +355,7 @@ sudo_json_add_value_int(struct json_container *json, const char *name,
 	    debug_return_bool(false);
 	break;
     case JSON_ARRAY:
-	if (value->u.array[0] == NULL || value->u.array[1] == NULL) {
-	    if (!json_append_buf(json, "[ "))
-		debug_return_bool(false);
-	    if (value->u.array[0] != NULL) {
-		if (!json_append_string(json, value->u.array[0]))
-		    debug_return_bool(false);
-		if (!json_append_buf(json, " "))
-		    debug_return_bool(false);
-	    }
-	    if (!json_append_buf(json, "]"))
-		debug_return_bool(false);
-	} else  {
-	    if (!json_append_buf(json, "["))
-		debug_return_bool(false);
-	    if (!json_append_buf(json, json->compact ? " " : "\n"))
-		debug_return_bool(false);
-	    json->indent_level += json->indent_increment;
-	    for (i = 0; value->u.array[i] != NULL; i++) {
-		if (!json_append_indent(json, json->indent_level))
-		    debug_return_bool(false);
-		if (!json_append_string(json, value->u.array[i]))
-		    debug_return_bool(false);
-		if (value->u.array[i + 1] != NULL) {
-		    if (!json_append_buf(json, ","))
-			debug_return_bool(false);
-		}
-		if (!json_append_buf(json, json->compact ? " " : "\n"))
-		    debug_return_bool(false);
-	    }
-	    json->indent_level -= json->indent_increment;
-	    if (!json_append_indent(json, json->indent_level))
-		debug_return_bool(false);
-	    if (!json_append_buf(json, "]"))
-		debug_return_bool(false);
-	}
+	sudo_fatalx("internal error: can't print JSON_ARRAY");
 	break;
     case JSON_OBJECT:
 	sudo_fatalx("internal error: can't print JSON_OBJECT");
diff --git a/logsrvd/eventlog.c b/logsrvd/eventlog.c
index ab48e642a..0f3121d67 100644
--- a/logsrvd/eventlog.c
+++ b/logsrvd/eventlog.c
@@ -288,7 +288,6 @@ format_json(ClientMessage__TypeCase event_type,
     struct json_container json = { 0 };
     struct json_value json_value;
     struct timespec ts;
-    char **strvec;
     size_t idx;
     debug_decl(format_json, SUDO_DEBUG_UTIL);
 
@@ -365,20 +364,22 @@ format_json(ClientMessage__TypeCase event_type,
 	    if (!sudo_json_add_value(&json, info->key, &json_value))
 		goto bad;
 	    break;
-	case INFO_MESSAGE__VALUE_STRLISTVAL:
-	    /* Must convert to NULL-terminated string vector. */
-	    strvec = strlist_copy(info->strlistval);
-	    if (strvec == NULL) {
-		sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
-		    "%s: %s", __func__, "unable to allocate memory");
+	case INFO_MESSAGE__VALUE_STRLISTVAL: {
+	    InfoMessage__StringList *strlist = info->strlistval;
+	    size_t n;
+
+	    if (!sudo_json_open_array(&json, info->key))
 		goto bad;
+	    for (n = 0; n < strlist->n_strings; n++) {
+		json_value.type = JSON_STRING;
+		json_value.u.string = strlist->strings[n];
+		if (!sudo_json_add_value(&json, NULL, &json_value))
+		    goto bad;
 	    }
-	    json_value.type = JSON_ARRAY;
-	    json_value.u.array = strvec;
-	    if (!sudo_json_add_value(&json, info->key, &json_value))
+	    if (!sudo_json_close_array(&json))
 		goto bad;
-	    free(strvec);
 	    break;
+	}
 	default:
 	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
 		"unexpected value case %d", info->value_case);
diff --git a/logsrvd/iolog_writer.c b/logsrvd/iolog_writer.c
index 71fb4be69..86fc40a5e 100644
--- a/logsrvd/iolog_writer.c
+++ b/logsrvd/iolog_writer.c
@@ -70,7 +70,7 @@ has_strlistval(InfoMessage *info)
  * The input string list need not be NULL-terminated.
  * Returns a NULL-terminated string vector.
  */
-char **
+static char **
 strlist_copy(InfoMessage__StringList *strlist)
 {
     char **dst, **src = strlist->strings;
diff --git a/logsrvd/logsrvd.h b/logsrvd/logsrvd.h
index 47e1f457f..0d2550990 100644
--- a/logsrvd/logsrvd.h
+++ b/logsrvd/logsrvd.h
@@ -188,7 +188,6 @@ int store_suspend(CommandSuspend *msg, struct connection_closure *closure);
 int store_winsize(ChangeWindowSize *msg, struct connection_closure *closure);
 void iolog_close_all(struct connection_closure *closure);
 void iolog_details_free(struct iolog_details *details);
-char ** strlist_copy(InfoMessage__StringList *strlist);
 
 /* logsrvd_conf.c */
 bool logsrvd_conf_read(const char *path);
diff --git a/plugins/audit_json/audit_json.c b/plugins/audit_json/audit_json.c
index a803a3d02..95b939faf 100644
--- a/plugins/audit_json/audit_json.c
+++ b/plugins/audit_json/audit_json.c
@@ -258,12 +258,23 @@ add_key_value(struct json_container *json, const char *str)
 static bool
 add_array(struct json_container *json, const char *name, char * const * array)
 {
+    const char *cp;
     struct json_value json_value;
     debug_decl(add_array, SUDO_DEBUG_PLUGIN);
 
-    json_value.type = JSON_ARRAY;
-    json_value.u.array = array;
-    debug_return_bool(sudo_json_add_value(json, name, &json_value));
+    if (!sudo_json_open_array(json, name))
+	debug_return_bool(false);
+    while ((cp = *array) != NULL) {
+	json_value.type = JSON_STRING;
+	json_value.u.string = cp;
+	if (!sudo_json_add_value(json, name, &json_value))
+	    debug_return_bool(false);
+	array++;
+    }
+    if (!sudo_json_close_array(json))
+	debug_return_bool(false);
+
+    debug_return_bool(true);
 }
 
 static bool