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MetaMask developer documentation

Integrate with and extend upon the world's leading self-custodial crypto wallet.

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Integrate your dapp with the MetaMask wallet

Your dapp can use MetaMask SDK and the MetaMask APIs to request users' Ethereum accounts, read data from connected blockchains, suggest that the user sign messages and transactions, and perform other functions on MetaMask from multiple dapp platforms.

🏁 Get started building a dapp

If you're new to dapp development, get started building a new dapp from scratch to integrate with MetaMask.

↔️ Connect your dapp to MetaMask

Connect your dapp to MetaMask by setting up MetaMask SDK and accessing users' Ethereum accounts.

🛠️ Use advanced MetaMask features

Optimize your dapp for MetaMask by using MetaMask-specific API methods, such as signing typed data.

Extend the functionality of MetaMask using Snaps

A snap is a JavaScript program run in an isolated environment that customizes the MetaMask wallet experience. You can create a snap that adds new API methods, adds support for different blockchain protocols, or modifies existing functionalities.

🏁 Get started with Snaps

Get started quickly by creating and customizing a simple snap, using the Snaps template built with React and TypeScript.

⚙️ Snaps tutorials

Follow the step-by-step tutorials to create snaps that estimate gas fees and provide transaction insights with custom UI.

🌐 Snaps JSON-RPC API

Use the Snaps JSON-RPC API to modify the functionality of MetaMask and communicate between dapps and snaps.