exportToJSON

[sneaker1]

Hello,

Could you add a function "exportToJSON" to to libp2p-peer-id-factory?

It should return a json object that can be used with the existing createFromJSON function.

{
  id: 'Qmd9kLSkR5Ub3Pfh9y172p2E9pZa56BAFNkaqvBGhBbPXw',
  privKey: PRIVKEY,
  pubKey: PUBKEY
}

[sneaker1]

I was just about to make a pull request for this, when i have seen there already was a PR and a discussion for this last year here #9

Persisting peerIds by exporting and importing seems like a core functionality to me.
I use it in all of my projects. The createFromJSON is also used often in the examples. Here was also a user recently who needed this libp2p/js-libp2p#1613

Is there another way to persist peer ids?

Handling uint8Arrays isnt't easy for everyone, so having this function would be nice.