diff --git a/lib.js b/lib.js
index 37b7d3d..c1d2aa1 100644
--- a/lib.js
+++ b/lib.js
@@ -40,6 +40,13 @@ const jwtOptions = {
     issuer: process.env.TOKEN_ISSUER
 };
 
+const client = jwksClient({
+    cache: true,
+    rateLimit: true,
+    jwksRequestsPerMinute: 10, // Default value
+    jwksUri: process.env.JWKS_URI
+});
+
 module.exports.authenticate = (params) => {
     console.log(params);
     const token = getToken(params);
@@ -49,13 +56,6 @@ module.exports.authenticate = (params) => {
         throw new Error('invalid token');
     }
 
-    const client = jwksClient({
-        cache: true,
-        rateLimit: true,
-        jwksRequestsPerMinute: 10, // Default value
-        jwksUri: process.env.JWKS_URI
-    });
-
     const getSigningKey = util.promisify(client.getSigningKey);
     return getSigningKey(decoded.header.kid)
         .then((key) => {