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Viem

Viem is a lightweight, modular TypeScript interface and client library for interacting with the Ethereum network. It provides composable modules and programmatic APIs that make building applications and libraries easier, with a strong emphasis on performance and minimal bundle size through tree-shaking. Viem offers first-class support for smart contract interactions, JSON-RPC abstractions, and utilities for ABI encoding/decoding while leveraging native browser BigInt for numeric operations. It is TypeScript-first, enabling inferred types from ABIs and EIP-712 typed data to improve developer productivity and safety. Viem also integrates with common local development tools like Anvil, Hardhat, and Ganache, and maintains a test suite running against forked Ethereum networks to ensure reliability.

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Introduction

Overview

Viem is a TypeScript-focused library designed to provide a fast, modular, and type-safe interface to Ethereum. It emphasizes small bundle sizes, composability, and strong typing so developers can build reliable applications and libraries without the overhead of large monolithic SDKs. Viem exposes a set of lightweight, focused modules that can be combined to accomplish common blockchain tasks such as querying chain data, sending transactions, and interacting with smart contracts.

Core capabilities

  • Modularity and Composability: Viem is built around small, single-purpose modules that you import and compose as needed, enabling optimized bundles through tree-shaking.

  • TypeScript-First APIs: The library offers extensive TypeScript typings, including the ability to infer types from ABIs and EIP-712 typed data, which reduces runtime errors and improves developer ergonomics.

  • Performance and Small Bundle Size: Viem targets minimal footprint and optimized architecture so client applications remain performant, particularly in browser and frontend contexts.

  • Smart Contract Utilities: Built-in utilities simplify ABI encoding, decoding, and contract interaction, making read and write operations against contracts more straightforward.

  • Native BigInt Usage: Instead of relying on large BigNumber libraries, Viem uses the browser-native BigInt type for numeric operations, reducing dependency overhead and complexity.

Main features

  1. Composable Clients: Create light clients by importing only the modules you need (e.g., transports, chains, providers) to keep builds lean and focused.

  2. Typed Smart Contract Interaction: Infer types from ABIs so contract calls and event handling become strongly typed and safer at compile time.

  3. JSON-RPC Abstractions: High-level helpers for the Ethereum JSON-RPC API make common queries simpler and eliminate boilerplate.

  4. Transport Flexibility: Support for multiple transport mechanisms (HTTP, WebSocket, and others) and easy integration with browser wallets and WalletConnect.

  5. Dev Tool Integrations: First-class compatibility with local tooling such as Anvil, Hardhat, and Ganache for testing and development workflows.

How Viem works

Viem exposes functions and client factories that let you configure a public or private client with a specific chain and transport. For example, you instantiate a public client with a chosen chain configuration and an HTTP transport, then call actions like getBlockNumber or read contract functions. The modular design encourages importing only the pieces you need — for instance, ABI utilities, chain definitions, and transport factories — which keeps the final bundle minimal.

Getting started
  1. Install the package via npm (npm i viem).
  2. Import the client creation helpers and the chain definitions you require.
  3. Configure a transport (http(), websocket, etc.) and instantiate your client.
  4. Use typed helpers to interact with contracts, send transactions, and query chain state.

Examples in the documentation demonstrate common patterns: inferring types from ABIs, decoding event logs, and integrating wallets or private keys for signing.

Why use Viem

  • Developer productivity: Strong TypeScript support with type inference from ABIs reduces debugging time and prevents many common errors.

  • Efficiency: Small, tree-shakeable modules reduce bundle size and runtime overhead compared to monolithic alternatives.

  • Reliability: A test suite that runs against forked networks and first-class support for popular dev tools helps ensure correctness during development.

  • Interoperability: Works with common wallet integrations, testing frameworks, and Ethereum networks, making it suitable for both dApp frontends and backend services.

Community, sponsorship, and support

Viem is open source and maintained on GitHub with an active discussions page and contributors. The project lists sponsors and collaborators, which demonstrates both community adoption and financial backing. Users can follow project updates on social channels, join discussions, and contribute via issues or pull requests.

Conclusion

Viem is a modern, TypeScript-centric toolkit for Ethereum that prioritizes composability, types, and performance. It is particularly well-suited for developers who want a minimal, maintainable dependency that integrates neatly into modern JavaScript/TypeScript workflows while offering robust smart contract and RPC tooling. If you value tree-shakeable modules, strict typing, and compatibility with common dev tools, Viem is a compelling choice.

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Information

  • Publisher
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  • Websiteviem.sh
  • Published date2025/12/23

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