express

Mesh + Express: Cardano Wallet in a Node.js Server

A minimal Express server that uses the Mesh SDK to work with a Cardano wallet on the backend. Use it as a starting point for APIs that derive addresses, build transactions or sign server-side.

What it does

src/index.ts starts an Express server on port 3000. When you request GET /, it creates a headless MeshWallet from a mnemonic and responds with the wallet's change address on the testnet (networkId: 0).

const wallet = new MeshWallet({
  networkId: 0,
  key: { type: "mnemonic", words: [/* 24 words */] },
});

const address = await wallet.getChangeAddress();

No blockchain provider is needed, because deriving an address happens locally.

Run it

npm install
npm run dev

Open http://localhost:3000.

Script	What it does
npm run dev	Start the server with ts-node
npm run clean	Remove dist, node_modules and package-lock.json

Next steps

• Replace the test mnemonic with your own. The solution × 24 mnemonic is public; never use it on mainnet.
• Add a provider such as BlockfrostProvider to fetch UTxOs and submit transactions. See MeshWallet.
• Build transactions with MeshTxBuilder.

Tech stack

Express 4, TypeScript, ts-node, @meshsdk/core.