Cryptographic key to JSON Web Key using javascript

I am a newbie in JavaScript or GatewayScript. I have a requirement where I need to convert the content of a .pem (which is in DataPower under local:///cert or can be added into a crypto object) to JWK.

Could anyone help me with the starting point on how to develop a javascript to

1. refer the crypto key object from DataPower (example crypto key object JWKCryptoCertObj)
2. Decrypt the crypto key object (example JWKCryptoCertObj.pem)
3. Convert the content of the key to JSON Web Key (jwk.readCertificate())

So far I have got to know that jwk.readCertificate() can help me to convert a key object to a JWK.

I have tried the below piece of code to fetch it:

var jwk = require('jwk'); var myJWK = jwk.readCertificate('cerjwk'); console.log(myJWK);

However, I get the below error in DataPower:

3:13:17 AM mpgw error 1277869681 error 0x00d30003 mpgw (PortTest): Rejected by filter; SOAP fault sent 

3:13:17 AM multistep error 1277869681 request 0x80c00009 mpgw (PortTest): request PortTest_Policy_rule_1 #2 gatewayscript: Transforming the content of INPUT. The transformation local:///jwk.js is applied. The results are stored in testop. failed: Internal Error 

3:13:17 AM gatewayscript error 1277869681 request 0x85800007 mpgw (PortTest): GatewayScript processing Error 'Error: Named certificate 'cerjwk' not found In file 'gatewayscript:///modules/jwk.js' line:428, stack:Error: Named certificate 'cerjwk' not found at Object.readCertificate (gatewayscript:///modules/jwk.js:428:18) at Object. (local:///jwk.js:5:17) at Script.execute (gatewayscript:///datapower.js:155:24) at Object. (gatewayscript:///datapower.js:582:55)' 

3:13:17 AM crypto error 1277869681 request 0x8580005c mpgw (PortTest): Named certificate 'cerjwk' not found 

Could anyone help me with the issue here? Thanks in advance!!

It finally worked, the thing that was needed to be changed was the cert, instead of the key.