generate-key.js

import { Mnemonic } from "@hashgraph/sdk";

async function main() {
    try {
        // generate a 24-word mnemonic
        const mnemonic = await Mnemonic.generate();
        console.log(`24 words mnemonic = ${mnemonic.toString()}`);

        const key = await mnemonic.toStandardEd25519PrivateKey("", 0);
        console.log(`private key = ${key.toString()}`);
        console.log(`public key = ${key.publicKey.toString()}`);

        // [...]

        // recover your key from the mnemonic
        // this takes space-separated or comma-separated words
        const recoveredMnemonic = await Mnemonic.fromString(
            mnemonic.toString(),
        );
        const recoveredRootKey =
            await recoveredMnemonic.toStandardEd25519PrivateKey("", 0);

        recoveredRootKey.toString() === key.toString()
            ? console.log(`successful key recovery!`)
            : console.log(`key recovery failed!`);

        const mnemonic12 = await Mnemonic.generate12();
        console.log(`12 words mnemonic = ${mnemonic12.toString()}`);

        const key12 = await mnemonic12.toStandardEd25519PrivateKey("", 0);
        console.log(`private key = ${key12.toString()}`);
        console.log(`public key = ${key12.publicKey.toString()}`);
    } catch (error) {
        console.error(error);
    }
}

void main()
    .then(() => process.exit(0))
    .catch(() => process.exit(1));