How to use generateKeyPair

[AaronD1]

Hello, I am attempting to generate an RS256 keypair for use in signing and authenticating access tokens, but I don't know how to get a string that I can save to a .env file from the generateKeyPair function.

Logging publicKey and privateKey to the console gives me this:
PublicKeyObject { [Symbol(kKeyType)]: 'public' }
PrivateKeyObject { [Symbol(kKeyType)]: 'private' }

Also, although I am implementing a simple access token/refresh token authentication system right now I would like to upgrade this system in the future - so I'm wondering how I can automate the creation of new key pairs every 24 hours or so and update a set of keypairs which rotate during the creation of new access/refresh tokens. I am using an .env file to store the private and public keys but I don't know how to update the properties of an .env file.

[cityseventeen]

Hi. I suggest you to use the KeyObject export() method. link nodejs doc

eg, after that you have generate the public and private key

publickey.export(format: 'pem', type: 'spki')

Or, if you want to use the method of jose, see this doc