BitcoinJS (bitcoinjs-lib)

The pure JavaScript Bitcoin library for node.js and browsers. A continued implementation of the original 0.1.3 version used by over a million wallet users; the backbone for almost all Bitcoin web wallets in production today.

Features

Clean: Pure JavaScript, concise code, easy to read.
Tested: Coverage > 90%, third-party integration tests.
Careful: Two person approval process for small, focused pull requests.
Compatible: Works on Node.js and all modern browsers.
Powerful: Support for advanced features, such as multi-sig, HD Wallets.
Secure: Strong random number generation, PGP signed releases, trusted developers.
Principled: No support for browsers with crap RNG (IE < 11)
Standardized: Node community coding style, Browserify, Node's stdlib and Buffers.
Fast: Optimized code, uses typed arrays instead of byte arrays for performance.
Experiment-friendly: Bitcoin Mainnet and Testnet support.
Altcoin-ready: Capable of working with bitcoin-derived cryptocurrencies (such as Dogecoin).

Should I use this in production?

If you are thinking of using the master branch of this library in production, stop. Master is not stable; it is our development branch, and only tagged releases may be classified as stable.

If you are looking for the original, it is tagged as 0.1.3. Unless you need it for dependency reasons, it is highly recommended that you use the newest version, which adds major functionality, fixes many bugs, and is well tested.

Installation

npm install bitcoinjs-lib

Setup

Node.js

var bitcoin = require('bitcoinjs-lib')

From the repo:

var bitcoin = require('./src/index.js')

Browser

Compile bitcoinjs-min.js with the following command:

$ npm run-script compile

After loading this file in your browser, you will be able to use the global bitcoin object.

Usage

These examples assume you are running bitcoinjs-lib in the browser.

Generating a Bitcoin address


key = bitcoin.ECKey.makeRandom()

// Print your private key (in WIF format)
console.log(key.toWIF())
// => 8c112cf628362ecf4d482f68af2dbb50c8a2cb90d226215de925417aa9336a48

// Print your public key (toString defaults to a Bitcoin address)
console.log(key.pub.getAddress().toString())
// => 14bZ7YWde4KdRb5YN7GYkToz3EHVCvRxkF

Creating a Transaction

tx = new bitcoin.Transaction()

// Add the input (who is paying) of the form [previous transaction hash, index of the output to use]
tx.addInput("aa94ab02c182214f090e99a0d57021caffd0f195a81c24602b1028b130b63e31", 0)

// Add the output (who to pay to) of the form [payee's address, amount in satoshis]
tx.addOutput("1Gokm82v6DmtwKEB8AiVhm82hyFSsEvBDK", 15000)

// Initialize a private key using WIF
key = bitcoin.ECKey.fromWIF("L1uyy5qTuGrVXrmrsvHWHgVzW9kKdrp27wBC7Vs6nZDTF2BRUVwy")

// Sign the first input with the new key
tx.sign(0, key)

// Print transaction serialized as hex
console.log(tx.toHex())
// => 0100000001313eb630b128102b60241ca895f1d0ffca2170d5a0990e094f2182c102ab94aa000000008a47304402200169f1f844936dc60df54e812345f5dd3e6681fea52e33c25154ad9cc23a330402204381ed8e73d74a95b15f312f33d5a0072c7a12dd6c3294df6e8efbe4aff27426014104e75628573696aed32d7656fb35e9c71ea08eb6492837e13d2662b9a36821d0fff992692fd14d74fdec20fae29128ba12653249cbeef521fc5eba84dde0689f27ffffffff01983a0000000000001976a914ad618cf4333b3b248f9744e8e81db2964d0ae39788ac00000000

// You could now push the transaction onto the Bitcoin network manually (see https://blockchain.info/pushtx)

Projects utilizing bitcoinjs-lib

Feel free to send pull requests to have your project/startup listed here.

Contributing

Instructions

Fork the repo
Push changes to your fork
Create a pull request

Running the test suite

$ npm test
$ npm run-script coverage

Alternatives / Complementing Libraries

License

This library is free and open-source software released under the MIT license.

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