Cannot read property 'toWIF' of undefined I am working on a cryptocurrency site in which each user will have there own individual deposit address to put currency on site. I am using bitcoin-core, bitcoinjs-lib, along with quite a few other modules.

Currently I am receiving an error after running the following code via node generate_wallet.js

var bip32 = require('bip32')
var bitcoinjs = require('bitcoinjs-lib');

var privKey = process.env.BIP32_PRIV;
var hdNode = bitcoinjs.HDNode.fromBase58(privKey);

var count = process.env.GENERATE_ADDRESSES ? parseInt(process.env.GENERATE_ADDRESSES) : 1000; // how many addresses to watch


var rescan = 'false';

for (var i = 1; i &lt;= count; ++i) {
  console.log('bitcoin-cli importprivkey ' +  hdNode.derive(i).keyPair.toWIF() + " '' " + rescan)
}


The error:

console.log('bitcoin-cli importprivkey ' +  hdNode.derive(i).keyPair.toWIF(L4tvCJoE9nxFnmZ4znCDvpqMLo9m8ybpAzxdE4ZKWDAfBqeM8JsR) + " '' " + rescan)
                                                                      ^

TypeError: Cannot read property 'toWIF' of undefined
    at Object.&lt;anonymous&gt; (/root/bustabit-depositor/src/generate_wallet.js:13:71)
    at Module._compile (internal/modules/cjs/loader.js:736:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:747:10)
    at Module.load (internal/modules/cjs/loader.js:628:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:568:12)
    at Function.Module._load (internal/modules/cjs/loader.js:560:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:801:12)
    at executeUserCode (internal/bootstrap/node.js:526:15)
    at startMainThreadExecution (internal/bootstrap/node.js:439:3)
root@ubuntu:~/bustabit-depositor/src#


Any suggestions would be greatly appreciated. I don't even know how to work around this as there's no results online about this. Maybe i'm just dumb haha
First, note that HDNode was removed in 4.0.0, so you should use the BIP32 module you included. Second, you don't need the extra keyPair property, so your code becomes:

var bip32 = require('bip32')

var privKey = process.env.BIP32_PRIV;
var hdNode = bip32.fromBase58(privKey);

var count = process.env.GENERATE_ADDRESSES ? parseInt(process.env.GENERATE_ADDRESSES) : 1000; // how many addresses to watch


var rescan = 'false';

for (var i = 1; i &lt;= count; ++i) {
  console.log('bitcoin-cli importprivkey ' +  hdNode.derive(i).toWIF() + " '' " + rescan)
}