fix: use correct return-variable

app.js

@@ -264,7 +264,7 @@ app.post('/issuer', (req, res) => {
   }
   issuer = req.body.issuer
   jwksOrigin = `https://${issuer}/`
-  const { privateKey: key, certDer: der, thumbPrint: thumb, exponent: exp, modulus: mod } = cert(jwksOrigin)
+  const { privateKey: key, certDer: der, thumbprint: thumb, exponent: exp, modulus: mod } = cert(jwksOrigin)
   privateKey = key
   certDer = der
   thumbprint = thumb

cert.js

@@ -122,8 +122,8 @@ const setup = (jwksOrigin) => {
 
   return {
     privateKey: forge.pki.privateKeyToPem(privateKey),
-    certDer: certDer,
-    thumbPrint: thumbprint.toString(),
+    certDer,
+    thumbprint: thumbprint.toString(),
     exponent: bnToB64(exponent),
     modulus: modulus.toString('base64')
   }