node package manager


BitcoinJS (bitcoinjs-lib)

Build Status NPM tip for next commit


The pure JavaScript Bitcoin library for node.js and browsers. Used by over a million wallet users and the backbone for almost all Bitcoin web wallets in production today.


  • 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.


npm install bitcoinjs-lib



var bitcoin = require('bitcoinjs-lib')


If you're familiar with how to use browserify, ignore this and proceed normally. These steps are advisory only, and may not be necessary for your application.

Browserify is assumed to be installed for these steps.

From your repository, create an index.js file

module.exports = {
  base58: require('bs58'),
  bitcoin: require('bitcoinjs-lib'),
  ecurve: require('ecurve'),
  BigInteger: require('bigi')

Install each of the above packages locally

npm install bs58 bitcoinjs-lib ecurve bigi

After installation, use browserify to compile index.js for use in the browser:

    $ browserify index.js --standalone foo > app.js

You will now be able to use <script src="app.js" /> in your browser, with each of the above exports accessible via the global foo object (or whatever you chose for the --standalone parameter above).

NOTE: See our package.json for the currently supported version of browserify used by this repository.

NOTE: When uglifying the javascript, you must exclude the following variable names from being mangled: Array, BigInteger, Boolean, ECPair, Function, Number, Point and Script. This is because of the function-name-duck-typing used in typeforce. Example:

uglifyjs ... --mangle --reserved 'Array,BigInteger,Boolean,ECPair,Function,Number,Point'

NOTE: If you expect this library to run on an iOS 10 device, ensure that you are using buffer@5.0.5 or greater.


Definitions for Flow typechecker are available in flow-typed repository.

You can either download them directly from the repo, or with the flow-typed CLI

# npm install -g flow-typed
$ flow-typed install -f 0.27 bitcoinjs-lib@2.2.0 # 0.27 for flow version, 2.2.0 for bitcoinjs-lib version

The definitions are complete and up to date with version 2.2.0. The definitions are maintained by @runn1ng.


The below examples are implemented as integration tests, they should be very easy to understand. Otherwise, pull requests are appreciated.

If you have a use case that you feel could be listed here, please ask for it!

Projects utilizing BitcoinJS


Stefan Thomas is the inventor and creator of this project. His pioneering work made Bitcoin web wallets possible. Daniel Cousens, Wei Lu, JP Richardson and Kyle Drake lead the major refactor of the library from 0.1.3 to 1.0.0.

Since then, many people have contributed. Click here to see the comprehensive list.


We are always accepting of pull requests, but we do adhere to specific standards in regards to coding style, test driven development and commit messages.

Please make your best effort to adhere to these when contributing to save on trivial corrections.

Running the test suite

$ npm test
$ npm run-script coverage

Complementing Libraries

  • BIP21 - A BIP21 compatible URL encoding utility library
  • BIP38 - Passphrase-protected private keys
  • BIP39 - Mnemonic generation for deterministic keys
  • BIP32-Utils - A set of utilities for working with BIP32
  • BIP66 - Strict DER signature decoding
  • BIP69 - Lexicographical Indexing of Transaction Inputs and Outputs
  • Base58 - Base58 encoding/decoding
  • Base58 Check - Base58 check encoding/decoding
  • BCoin - BIP37 / Bloom Filters / SPV client
  • coinselect - A fee-optimizing, transaction input selection module for bitcoinjs-lib.
  • insight - A bitcoin blockchain API for web wallets.
  • merkle-lib - A performance conscious library for merkle root and tree calculations.
  • minimaldata - A module to check bitcoin policy: SCRIPT_VERIFY_MINIMALDATA




BitcoinJS (c) 2011-2016 bitcoinjs-lib contributors

Released under MIT license