Monero JavaScript Library

A Node.js library for creating Monero applications using RPC and WebAssembly bindings to monero v0.17.2.3 'Oxygen Orion'.

• Supports wallet and daemon RPC clients.
• Supports client-side wallets in Node.js or the browser using WebAssembly.
• Supports multisig, view-only, and offline wallets.
• Wallet types are interchangeable by conforming to a common interface.
• Uses a clearly defined data model and API specification intended to be intuitive and robust.
• Query wallet transactions, transfers, and outputs by their properties.
• Fetch and process binary data from the daemon (e.g. raw blocks).
• Receive notifications when blocks are added to the chain or when wallets sync, send, or receive.
• Over 280 passing Mocha tests.

Table of contents

• Architecture
• Sample code
• Documentation
• Using monero-javascript in your project
• Building WebAssembly binaries from source
• Running tests
• Related projects
• License
• Donations

Architecture

Build Node.js or browser applications using RPC or WebAssembly bindings to monero-project/monero. Wallet implementations are interchangeable by conforming to a common interface, MoneroWallet.js.

Sample code

// import library
const monerojs = require("monero-javascript");

// connect to daemon
let daemon = await monerojs.connectToDaemonRpc("http://localhost:38081", "superuser", "abctesting123");
let height = await daemon.getHeight();            // 1523651
let feeEstimate = await daemon.getFeeEstimate();  // 1014313512
let txsInPool = await daemon.getTxPool();         // get transactions in the pool

// open wallet on monero-wallet-rpc
let walletRpc = await monerojs.connectToWalletRpc("http://localhost:38084", "rpc_user", "abc123");
await walletRpc.openWallet("sample_wallet_rpc", "supersecretpassword123");
let primaryAddress = await walletRpc.getPrimaryAddress(); // 555zgduFhmKd2o8rPUz...
let balance = await walletRpc.getBalance();               // 533648366742
let txs = await walletRpc.getTxs();                       // get transactions containing transfers to/from the wallet

// create wallet from mnemonic phrase using WebAssembly bindings to monero-project
let walletFull = await monerojs.createWalletFull({
  path: "sample_wallet_full",
  password: "supersecretpassword123",
  networkType: "stagenet",
  serverUri: "http://localhost:38081",
  serverUsername: "superuser",
  serverPassword: "abctesting123",
  mnemonic: "hefty value scenic...",
  restoreHeight: 573936,
});

// synchronize with progress notifications
await walletFull.sync(new class extends monerojs.MoneroWalletListener {
  onSyncProgress(height, startHeight, endHeight, percentDone, message) {
    // feed a progress bar?
  }
});

// synchronize in the background every 5 seconds
await walletFull.startSyncing(5000);

// receive notifications when funds are received, confirmed, and unlocked
let fundsReceived = false;
await walletFull.addListener(new class extends monerojs.MoneroWalletListener {
  onOutputReceived(output) {
    let amount = output.getAmount();
    let txHash = output.getTx().getHash();
    let isConfirmed = output.getTx().isConfirmed();
    let isLocked = output.getTx().isLocked();
    fundsReceived = true;
  }
});

// send funds from RPC wallet to WebAssembly wallet
let createdTx = await walletRpc.createTx({
  accountIndex: 0,
  address: await walletFull.getAddress(1, 0),
  amount: "250000000000", // send 0.25 XMR (denominated in atomic units)
  relay: false // create transaction and relay to the network if true
});
let fee = createdTx.getFee(); // "Are you sure you want to send... ?"
await walletRpc.relayTx(createdTx); // relay the transaction

// recipient receives unconfirmed funds within 5 seconds
await new Promise(function(resolve) { setTimeout(resolve, 5000); });
assert(fundsReceived);

// save and close WebAssembly wallet
await walletFull.close(true);

Documentation

• JSDocs
• API and model overview with visual diagrams
• Mocha tests
• Installing prerequisites
• Getting started part 1: creating a Node.js application
• Getting started part 2: creating a web application
• Creating wallets
• The data model: blocks, transactions, transfers, and outputs
• Getting transactions, transfers, and outputs
• Sending funds
• Multisig wallets
• View-only and offline wallets
• HTTPS and self-signed certificates

Using monero-javascript in your project

1. cd your_project or mkdir your_project && cd your_project && npm init
2. npm install monero-javascript@0.5.6
3. Add require("monero-javascript") to your application code.
4. If building a browser application, copy assets from ./dist to your web app's build directory as needed.

If using RPC servers:

1. Download and install Monero CLI.
2. Start monero-daemon-rpc, e.g.: ./monerod --stagenet (or use a remote daemon).
3. Start monero-wallet-rpc, e.g.: ./monero-wallet-rpc --daemon-address http://localhost:38081 --stagenet --rpc-bind-port 38084 --rpc-login rpc_user:abc123 --wallet-dir ./

Building WebAssembly binaries from source

This project uses WebAssembly to package and execute Monero's source code for use in a browser or other WebAssembly-supported environment.

Compiled WebAssembly binaries are committed to ./dist for convenience, but these files can be built independently from source code:

1. Install and activate emscripten.
   1. Clone emscripten repository: git clone https://github.com/emscripten-core/emsdk.git
   2. cd emsdk
   3. git pull && ./emsdk install latest-upstream && ./emsdk activate latest-upstream && source ./emsdk_env.sh
   4. export EMSCRIPTEN=path/to/emsdk/upstream/emscripten (change for your system)
2. Clone monero-javascript repository: git clone https://github.com/monero-ecosystem/monero-javascript.git
3. cd monero-javascript
4. ./bin/update_submodules.sh
5. Modify ./external/monero-cpp/external/monero-project/src/crypto/wallet/CMakeLists.txt from set(MONERO_WALLET_CRYPTO_LIBRARY "auto" ... to set(MONERO_WALLET_CRYPTO_LIBRARY "cn" ....
6. ./bin/build_all.sh (install monero-project dependencies as needed for your system)

Running tests

1. Clone the project repository: git clone https://github.com/monero-ecosystem/monero-javascript.git
2. cd monero-javascript
3. Start RPC servers:
   1. Download and install Monero CLI.
   2. Start monero-daemon-rpc, e.g.: ./monerod --stagenet (or use a remote daemon).
   3. Start monero-wallet-rpc, e.g.: ./monero-wallet-rpc --daemon-address http://localhost:38081 --stagenet --rpc-bind-port 38084 --rpc-login rpc_user:abc123 --wallet-dir ./
4. Configure the appropriate RPC endpoints, authentication, and other settings in TestUtils.js (e.g. WALLET_RPC_CONFIG and DAEMON_RPC_CONFIG).

Running tests in Node.js

• Run all tests: npm test
• Run tests by their description, e.g.: npm run test -- --grep "Can get transactions"

Running tests in a browser

1. Start monero-wallet-rpc servers used by tests: ./bin/start_wallet_rpc_test_servers.sh
2. In another terminal, build browser tests: ./bin/build_browser_tests.sh
3. Access http://localhost:8080/tests.html in a browser to run all tests

Related projects

• monero-java
• monero-cpp
• monerostresstester.com - repeatedly sends txs to self to stress test the network (under development)
• xmr-sample-app - sample web app template (under development)
• monerowebwallet.com - open-source, client-side web wallet (under development)

License

This project is licensed under MIT.

Donations

If this library brings you value, please consider donating.

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