How export/import ed25519, X25519 private and public keys in spki pkcs8 der format?

[xgiovio]

Hello,
considering storing and retrieving keys to and from db, how can i use ed25519, X25519 keys exporting and importing in spki pkcs8 der format? I need compatibility with crypto mobule from node.

[paulmillr]

You will need to write converters from/to those formats.