Seed to public key

get_public_key_from_seed.js

var bitcoin = require('bitcoinjs-lib');
var network = bitcoin.networks.testnet;
var bip39 = require('bip39');

var mnemonic = 'Insert mnemonics'
var seed = bip39.mnemonicToSeed(mnemonic)
var root = bitcoin.HDNode.fromSeedBuffer(seed, network);
var master = root.derivePath("m/44'/1'/0'");
var xpub = master.neutered().toBase58();

var masterPubKey = bitcoin.HDNode.fromBase58(xpub, network);

var child = masterPubKey.derivePath("0/" + 1)
console.log(xpub);
console.log(child.getAddress());