MeshJS: The Cardano TypeScript SDK for Modern dApp Development

MeshJS is the leading open-source Cardano TypeScript SDK, giving you a transaction builder, wallet connectors, React components, and smart contract tools to start building dApps in minutes.

npm install @meshsdk/core

Get Started

View on GitHub

Less than 60kB

AI Integration

Production Ready

34K+ Monthly Downloads

Everything You Need to Build Cardano dApps

Wallets, transaction builders, data utilities, smart contract libraries, and blockchain providers in one SDK

Wallets

Connect CIP-30 browser wallets and create server-side wallets for Cardano dApps.

Transaction Builder

Build and sign Cardano transactions with automatic UTXO selection and fee calculation.

Transaction Parser

Parse Cardano transactions from CBOR, run unit tests, and rebuild with modifications.

Providers

Connect to Cardano via Blockfrost, Koios, Ogmios, Maestro, or UTxO RPC with a unified API.

Scalus Emulator

A Scalus-based emulator for testing and validation.

Utilities

CBOR serializers, bech32 resolvers, and Cardano data type converters for off-chain code.

React Components

Pre-built React wallet UI components and hooks for Cardano dApp frontends.

Smart Contracts Lib

Production-ready Cardano smart contracts with TypeScript SDK, full docs, and live demos.

Aiken

Write Cardano smart contracts in Aiken and build off-chain code with Mesh SDK.

Hydra

Build fast, low-cost Cardano apps with Hydra Layer 2 state channels.

Yaci

Spin up a local Cardano devnet for testing smart contracts and transactions.

Midnight

Build privacy-preserving dApps with zero-knowledge proofs on the Midnight Network.

Why Developers Pick Mesh

Built by developers who ship Cardano apps every day

TypeScript-First

Full type definitions for every API. Catch errors at compile time, get autocomplete in your editor, and skip the guesswork. No separate type packages needed.

Small and Fast

The core package is under 60kB. Tree-shakeable imports keep your bundle lean. No bloated dependencies dragging down your app's load time.

Works With Every Provider

Swap between Blockfrost, Koios, Maestro, Ogmios, and UTxO RPC with one line. Same API, different backend. Run offline for testing with the built-in offline fetcher.

Agent Skills

AI-Powered Development

Give your AI coding assistant deep knowledge of Mesh SDK. Agent Skills work with Claude Code, Cursor, Codex, and 37+ tools so your AI already knows the API, patterns, and common errors.

Transaction building patterns Wallet integration recipes Low-level utilities & troubleshooting

Browse on GitHub

terminal

  # Install all Mesh skills
  npx skills add MeshJS/skills

  # Install for a specific agent
  npx skills add MeshJS/skills -a claude-code
  npx skills add MeshJS/skills -a cursor
  npx skills add MeshJS/skills -a codex

Transaction Builder

Cardano Transaction Builder in TypeScript

MeshTxBuilder is a chainable API for constructing any Cardano transaction. Build simple ADA transfers, Plutus script interactions, token minting, governance votes, and staking operations with automatic UTXO selection and fee calculation.

Send ADA, tokens & mint NFTs Plutus V1/V2/V3 script spending Governance, staking & pool ops

sendAda.ts

  import { MeshTxBuilder } from '@meshsdk/transaction';

  const txBuilder = new MeshTxBuilder();

  const unsignedTx = await txBuilder
    .txIn(txHash, txIndex)
    .txOut(recipientAddress, [
      { unit: 'lovelace', quantity: '5000000' },
    ])
    .changeAddress(senderAddress)
    .selectUtxosFrom(utxos)
    .complete();

connectWallet.tsx

  import { CardanoWallet } from '@meshsdk/react';

  export default function Page() {
    return (
      <>
        <CardanoWallet
          label={"Connect a Wallet"}
          persist={true}
          onConnected={()=>{console.log('on connected')}}
        />
      </>
    );
  }

React Components

Cardano React Components and Wallet Hooks

Drop in pre-built React components for Cardano wallet connections and use hooks to read balances, addresses, and assets. Works with Next.js, Vite, and any React setup.

Getting Started with React UI Components Wallet Hooks

Wallet Integration

Cardano Wallet Integration for Browser and Server

Connect CIP-30 browser wallets like Nami, Eternl, and Lace, or create server-side wallets with seed phrases and private keys. Build multi-signature apps, minting backends, and automated scripts with one unified API.

Browser Wallet (CIP-30)Headless Wallet (Server-Side)Prove Wallet Ownership

meshWallet.tsx

  import { MeshWallet } from '@meshsdk/core';

  const wallet = new MeshWallet({
    networkId: 0, // 0: testnet, 1: mainnet
    fetcher: provider,
    submitter: provider,
    key: {
      type: 'mnemonic',
      words: ["solution","solution",...,"solution"],
    },
  });

Smart Contracts

Production-Ready Smart Contracts

Skip writing boilerplate. Mesh ships open-source smart contracts for common use cases: NFT marketplaces, token vesting, escrow, asset swaps, payment splitting, and more. Each contract comes with full TypeScript SDK integration, documentation, and live demos.

Aiken smart contract support Plutus V1/V2/V3 validators CIP-57 blueprint generation

Start Building in Three Steps

Install

npm i @meshsdk/core

Pick a Provider

Blockfrost, Koios, Maestro, Ogmios, or offline

Build

Transactions, wallets, minting, smart contracts

Build Your First dApp

Clone an Example