generate rsa keypair and format public key in openssh format in javascript

index.js

// warning you probably want `ssh-keygen -t ed25519` for most use cases. this method lacks secure prng and uses weak rsa
var keypair = require('keypair')
var forge = require('node-forge')

// generates new keypair (slow)
var pair = keypair()

// creates intermediate forge key object
var publicKey = forge.pki.publicKeyFromPem(pair.public)

// formats in openssh format, e.g. compatible with authorized_keys file
var publicKeyOpenSSH = forge.ssh.publicKeyToOpenSSH(publicKey, 'user@domain.tld')