diff --git a/example/package-lock.json b/example/package-lock.json
index beb17f7..b8d2430 100644
--- a/example/package-lock.json
+++ b/example/package-lock.json
@@ -1,8 +1,1003 @@
 {
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+    "node_modules/uglify-js": {
+      "version": "3.4.9",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.9.tgz",
+      "integrity": "sha512-8CJsbKOtEbnJsTyv6LE6m6ZKniqMiFWmm9sRbopbkGs3gMPPfd3Fh8iIA4Ykv5MgaTbqHr4BaoGLJLZNhsrW1Q==",
+      "optional": true,
+      "dependencies": {
+        "commander": "~2.17.1",
+        "source-map": "~0.6.1"
+      },
+      "bin": {
+        "uglifyjs": "bin/uglifyjs"
+      },
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/uuid": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.2.tgz",
+      "integrity": "sha512-+NYs2QeMWy+GWFOEm9xnn6HCDp0l7QBD7ml8zLUmJ+93Q5NF0NocErnwkTkXVFNiX3/fpC6afS8Dhb/gz7R7eg==",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE="
+    },
+    "node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
+    "node_modules/wordwrap": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
+      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+    }
+  },
   "dependencies": {
     "accepts": {
       "version": "1.3.5",
diff --git a/example/server/api/index.js b/example/server/api/index.js
index 3ea3966..4cabadf 100644
--- a/example/server/api/index.js
+++ b/example/server/api/index.js
@@ -1,6 +1,8 @@
 const Router = require('express').Router;
 const Flagsmith = require('../../../build');
 const environmentKey = '';
+const nodecache = require("node-cache");
+
 if (!environmentKey) {
     throw new Error(
         'Please generate a Server Side SDK Key in environment settings to run the example'
@@ -9,9 +11,10 @@ if (!environmentKey) {
 const flagsmith = new Flagsmith({
     environmentKey,
     enableLocalEvaluation: true,
-    defaultFlagHandler: str => {
-        return { enabled: false, isDefault: true, value: null };
-    }
+    cache: new nodecache({
+        stdTTL: 10,
+        checkperiod: 10,
+    }),
 });
 
 module.exports = () => {
diff --git a/example/server/index.js b/example/server/index.js
index e92a557..9fe9d64 100755
--- a/example/server/index.js
+++ b/example/server/index.js
@@ -15,7 +15,7 @@ app.use(bodyParser.json());
 app.use('/api', api());
 
 app.server.listen(PORT);
-console.log('Server started on port ' + app.server.address().port);
+console.log('Server started on port ' + PORT);
 console.log();
 console.log('Go to http://localhost:' + PORT + '/api');
 console.log('To get an example response for getFlags');
diff --git a/package-lock.json b/package-lock.json
index 74d9827..5bc0e1d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "flagsmith-nodejs",
-  "version": "2.0.1",
+  "version": "2.0.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "flagsmith-nodejs",
-      "version": "2.0.1",
+      "version": "2.0.2",
       "license": "MIT",
       "dependencies": {
         "big-integer": "^1.6.51",
diff --git a/sdk/index.ts b/sdk/index.ts
index 9eeb3af..730fedf 100644
--- a/sdk/index.ts
+++ b/sdk/index.ts
@@ -298,6 +298,7 @@ export class Flagsmith {
             defaultFlagHandler: this.defaultFlagHandler
         });
         if (!!this.cache) {
+            // @ts-ignore node-cache types are incorrect, ttl should be optional
             await this.cache.set('flags', flags);
         }
         return flags;
@@ -321,6 +322,7 @@ export class Flagsmith {
         });
 
         if (!!this.cache) {
+            // @ts-ignore node-cache types are incorrect, ttl should be optional
             await this.cache.set(`flags-${identifier}`, flags);
         }
 
@@ -336,6 +338,7 @@ export class Flagsmith {
                 defaultFlagHandler: this.defaultFlagHandler
             });
             if (!!this.cache) {
+                // @ts-ignore node-cache types are incorrect, ttl should be optional
                 await this.cache.set('flags', flags);
             }
             return flags;
@@ -361,6 +364,7 @@ export class Flagsmith {
                 defaultFlagHandler: this.defaultFlagHandler
             });
             if (!!this.cache) {
+                // @ts-ignore node-cache types are incorrect, ttl should be optional
                 await this.cache.set(`flags-${identifier}`, flags);
             }
             return flags;
diff --git a/sdk/types.ts b/sdk/types.ts
index 99f27e6..2dc906c 100644
--- a/sdk/types.ts
+++ b/sdk/types.ts
@@ -1,8 +1,8 @@
 import { Flags } from "./models";
 
 export interface FlagsmithCache {
-  get(key: string): Promise<Flags>;
-  set(key: string, value: Flags): Promise<void>;
-  has(key: string): Promise<boolean>;
+  get(key: string): Promise<Flags|undefined> | undefined;
+  set(key: string, value: Flags, ttl: string | number): boolean | Promise<boolean>;
+  has(key: string): boolean | Promise<boolean>;
   [key: string]: any;
-}
+}
\ No newline at end of file
diff --git a/tests/sdk/utils.ts b/tests/sdk/utils.ts
index 0aa2529..b09856c 100644
--- a/tests/sdk/utils.ts
+++ b/tests/sdk/utils.ts
@@ -18,8 +18,9 @@ export class TestCache implements FlagsmithCache {
         return !!this.cache[name];
     }
 
-    async set(name: string, value: Flags) {
+    async set(name: string, value: Flags, ttl: number|string) {
         this.cache[name] = value;
+        return true
     }
 }