lnd.js

// npm init -f
// npm install grpc --save
// npm install @grpc/proto-loader --save


const grpc = require('grpc');
const fs = require('fs');
const protoLoader = require('@grpc/proto-loader');

process.env.GRPC_SSL_CIPHER_SUITES = 'HIGH+ECDSA';


const lndCert = fs.readFileSync('tls.cert');
const m = fs.readFileSync('admin.macaroon');

const sslCreds = grpc.credentials.createSsl(lndCert);

protoLoader.load('rpc.proto', {
    keepCase: true,
    longs: String,
    enums: String,
    defaults: true,
    oneofs: true
}).then(packageDefinition => {
    const packageObject = grpc.loadPackageDefinition(packageDefinition);

    const lnrpc = packageObject.lnrpc;

    const macaroon = m.toString('hex');
    const metadata = new grpc.Metadata();
    metadata.add('macaroon', macaroon);
    const macaroonCreds = grpc.credentials.createFromMetadataGenerator((_args, callback) => {
        callback(null, metadata);
    });
    const credentials = grpc.credentials.combineChannelCredentials(sslCreds, macaroonCreds);

    const client = new lnrpc.Lightning('localhost:10009', credentials);

    client.getInfo({}, function (err, response) {
        console.log(err);
        console.log('GetInfo:', response);
    });
});

Thank you for this. I was struggling with replacing the deprecated grpc.load still being used in the LND example code. It seems that the settings object in protoLoader.load did the trick. So, this:

{
    keepCase: true,
    longs: String,
    enums: String,
    defaults: true,
    oneofs: true
}