Bitcoinjs
A JavaScript Bitcoin library for Node.js and browsers, supporting advanced Bitcoin transaction and address operations.
Overview
bitcoinjs-lib is a widely used JavaScript library designed for Bitcoin protocol operations in both Node.js and browser environments. Written in TypeScript with committed JavaScript files for verification, it provides developers with tools to create, sign, and manage Bitcoin transactions and addresses, including support for legacy, SegWit, and Taproot features. The library emphasizes security and auditability, with over 95% test coverage and adherence to Bitcoin standards. It is modular, allowing developers to include only necessary cryptographic components to reduce bundle size.
The library supports advanced Bitcoin scripting capabilities such as multisignature wallets, time-locked transactions (using CHECKLOCKTIMEVERIFY and CHECKSEQUENCEVERIFY), and various address formats (P2PKH, P2SH, P2WPKH, P2WSH). It integrates with complementary libraries for mnemonic generation (BIP39), key derivation (BIP32), and fee optimization (coinselect). bitcoinjs-lib is suitable for developers building wallets, payment processors, or any Bitcoin-related infrastructure requiring low-level transaction control.
What sets bitcoinjs-lib apart is its strong community support, extensive documentation, and rigorous testing. It encourages users to verify cryptographic operations and random number generation due to the critical security implications in Bitcoin key management. The library also provides a browser-friendly build process and alternative ECC libraries to accommodate different environments, including those with WebAssembly limitations. Developers can get started by installing via npm and exploring comprehensive examples and integration tests available in the repository.
The Problem
Developers building Bitcoin applications need a reliable, secure, and flexible library to handle Bitcoin transactions, address generation, and key management across different environments. Ensuring cryptographic correctness and compatibility with Bitcoin standards is complex and error-prone without a well-maintained toolkit.
The Solution
Key Features
Transaction creation and signing
Build and sign Bitcoin transactions including complex scripts and multisig.
Address generation
Generate various Bitcoin address types including P2PKH, P2SH, P2WPKH, P2WSH, and Taproot.
Integration with complementary BIP libraries
Works with BIP32, BIP39, BIP66, BIP68, BIP69, and others for key derivation, mnemonics, and transaction ordering.
Key Strengths
How Developers Use Bitcoinjs
Building a Bitcoin wallet with advanced transaction features
Developers use bitcoinjs-lib to create wallets that support SegWit and Taproot transactions, multisig wallets, and time-locked spending conditions.
Implementing Bitcoin payment processing
Payment processors integrate bitcoinjs-lib to construct and sign transactions securely, ensuring compatibility with Bitcoin network standards.
Creating custom Bitcoin transaction scripts
Developers leverage bitcoinjs-lib to build and test complex Bitcoin scripts such as multisig, CLTV, and CSV for specialized use cases.
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Pricing
Open Source | |
|---|---|
| Price (Monthly) | Free |
| Price (Annual) | Free |
| Messaging | N/A |
| Support | Community support via GitHub and IRC/Matrix channels |
| Analytics |
Resources
bitcoinjs-lib provides extensive documentation, integration tests as examples, and a public Web UI for exploring key APIs. The community is accessible via GitHub issues, IRC, and Matrix channels for support and collaboration.