diff --git a/finder/nodejs/lib/base64url.ts b/finder/nodejs/lib/base64url.ts
index 163a1c6e..c2e9a59d 100644
--- a/finder/nodejs/lib/base64url.ts
+++ b/finder/nodejs/lib/base64url.ts
@@ -1,4 +1,5 @@
 const W3C_ELEMENT: string = `element-6066-11e4-a52e-4f735466cecf`;
+const MJSON_ELEMENT: string = `ELEMENT`;
 
 export const encode = (input: string) =>
   Buffer.from(input)
@@ -7,16 +8,14 @@ export const encode = (input: string) =>
     .replace(/\+/g, `-`)
     .replace(/\//g, `_`);
 
-export const decode = (input: string | {ELEMENT: string}) => {
+export const decode = (input: string | {[key: string]: string}) => {
   let base64String: string = ``;
   if (typeof input === `string`) {
     base64String = input;
-  // @ts-ignore
-  } else if (typeof input === `object` && input[W3C_ELEMENT]) {
-    // @ts-ignore
+  } else if (typeof input === `object` && W3C_ELEMENT in input) {
     base64String = input[W3C_ELEMENT];
-  } else if (typeof input === `object` && input.ELEMENT) {
-    base64String = input.ELEMENT;
+  } else if (typeof input === `object` && MJSON_ELEMENT in input) {
+    base64String = input[MJSON_ELEMENT];
   } else {
     throw new Error(`input is invalid ${JSON.stringify(input)}`);
   }
diff --git a/finder/nodejs/package.json b/finder/nodejs/package.json
index f5c7ced6..8e7fa8bd 100644
--- a/finder/nodejs/package.json
+++ b/finder/nodejs/package.json
@@ -21,7 +21,7 @@
     "build"
   ],
   "scripts": {
-    "test": "ts-mocha lib/**/*_test.ts",
+    "test": "mocha --require ts-node/register lib/**/*_test.ts",
     "prepublishOnly": "cp ../../LICENSE ./",
     "prepare": "npm run clean && npm run compile",
     "clean": "rm -rf build",
@@ -34,7 +34,7 @@
     "@types/node": "^22.0.0",
     "expect": "^29.2.0",
     "mocha": "^11.0.1",
-    "ts-mocha": "^10.0.0",
+    "ts-node": "^10.9.2",
     "tslint": "^6.1.3",
     "typescript": "^5.0.2"
   }