diff --git a/src/config_token_store/adapter/env/index.js b/src/config_token_store/adapter/env/index.js
index 43953e7..0f85507 100644
--- a/src/config_token_store/adapter/env/index.js
+++ b/src/config_token_store/adapter/env/index.js
@@ -27,7 +27,7 @@ class EnvConfigTokenStoreAdapter extends BaseConfigTokenStoreAdapter {
       let token;
       token = data[id];
 
-      return JSON.stringify(token);
+      return typeof token !== "string" ? JSON.stringify(token) : token;
     } catch (e) {
       throw e;
     }
diff --git a/src/config_token_store/adapter/file/index.js b/src/config_token_store/adapter/file/index.js
index e166811..e7846d1 100644
--- a/src/config_token_store/adapter/file/index.js
+++ b/src/config_token_store/adapter/file/index.js
@@ -28,7 +28,7 @@ class FileConfigTokenStoreAdapter extends BaseConfigTokenStoreAdapter {
       let token;
       token = data[id];
 
-      return JSON.stringify(token);
+      return typeof token !== "string" ? JSON.stringify(token) : token;
     } catch (e) {
       throw e;
     }
diff --git a/src/header/index.js b/src/header/index.js
index f8412dd..5d8bf4b 100644
--- a/src/header/index.js
+++ b/src/header/index.js
@@ -137,7 +137,7 @@ class HeaderInjector {
     if (value === undefined) {
       value = "";
     }
-    logger.debug("injecting header: %s with value: %s", headerName, value);
+    logger.info("injecting header: %s with value: %s", headerName, value);
     res.setHeader(headerName, value);
   }
 }
diff --git a/src/utils.js b/src/utils.js
index ab62e1b..f53aa8a 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -126,11 +126,11 @@ function generate_csrf_id() {
 function toBoolean(input) {
   //return !!(dataStr?.toLowerCase?.() === 'true' || dataStr === true || Number.parseInt(dataStr, 10) === 0);
   //return !!(dataStr?.toLowerCase?.() === 'true' || dataStr === true);
-  
+
   if (typeof input == "undefined" || input === null) {
     return false;
   }
-  
+
   if (typeof input == "boolean") {
     return input;
   }
@@ -158,7 +158,7 @@ function toBoolean(input) {
 
 function is_jwt(jwtString) {
   const re = new RegExp(
-    /^[A-Za-z0-9-_=]+\.[A-Za-z0-9-_=]+\.?[A-Za-z0-9-_.+/=]*$/
+    /^[a-zA-Z0-9\-_]+?\.[a-zA-Z0-9\-_]+?\.([a-zA-Z0-9\-_]+)?$/
   );
   return re.test(jwtString);
 }