v4 is here! Read all about it here.

Build dApps on any EVM Chain with TypeScript
Libraries

Trusted by

Made with 💛 by ChainSafe Systems

Why Web3.js?

Web3.js was established in 2014, making it the oldest web3 library. With extensive documentation, an active community and modular design, Web3.js is powerful and easy-to-use.

monthly npm usage

monthly CDN requests

500K

Weekly downloads

19K

GitHub stars

3K+

Dependent projects

With Web3.js, you can

Deploy and interact with smart contracts as TS/JS objects

Interact with the Ethereum Name Service (ENS)

Get block and state information from Ethereum nodes

Subscribe to specific on-chain or smart contract events

Create and import accounts, sign data and transactions

Have access to utilities with built-in helpers for Ethereum dApps and web3 packages

Step 1. Import Web3 module.

Import {Web3} from “web3”

Step 2. Initialize provider.

Const web3 = new Web3(“provider_url”)

Step 3. Get the current block number.

Const blockNumber = await web3.eth.getBlockNumber()

Web3.js Features

Abstractions over the JSON-RPC API

Simplifying interaction for your Developer Experience.

Dynamic contract types and full API in TypeScript

Enforced with strict types for enhanced security and safety.

Most efficient ABI Encoder & Decoder

Include only what you need during bundling for optimized performance.

ESM and CJS module builds

Support for both ECMAScript module and CommonJS module builds for flexible integration with various project setups.

Custom Output formatters

Format any returned value to be a string, number, BigInt, etc., providing flexibility in handling output data.

Language aligned

to the official Ethereum terminology

Our Supporters

Become a Web3js sponsor

“At Chainstack, Web3.js has been instrumental in developing our RPC API documentation and tutorials. Its robust features and seamless integration allow us to showcase use cases effectively, enabling developers to leverage the full potential of blockchain technology quickly. Web3.js is a foundational tool that enhances our ability to support developers in building scalable and innovative applications on multiple blockchains.”

“Developing the Namespace ENS plugin for Web3.js was a smooth experience. Developer docs are concise and easy to follow, and their SDK made the process even more frictionless. On top of that, the DevRel team was always available to provide any support if needed.”

“We've been relying on Web3.js to build DeFi Saver since 2020. With us having built a lot of custom infra in-house, Web3.js had been a great tool for this purpose. The API has been stable and it provided us enough visibility and control over the entire stack. It's also been here for a while and all the tooling around it is stable and ready, so there's hardly ever any issues.”