Documentation

Explore our guides and examples to learn how to integrate OpenZeppelin security products with your project.

Explore using OpenZeppelin

OpenZeppelin provides a complete suite of security products to adopt security best practices from the first line of code all the way to running your decentralized application on-chain.

Contracts A library of modular, reusable, and secure smart contracts, written in Solidity.

Defender A mission-critical developer security platform to code, audit, deploy, monitor, and operate blockchain applications.

Upgrades A comprehensive suite of contracts and tooling to deploy and manage upgradeable contracts on Ethereum.

Contracts for Cairo A library for secure smart contract development written in Cairo for Starknet.

Solidity Docgen A tool for automatically generating documentation based on the natspec comments of your Solidity contracts.

Security Audits

OpenZeppelin security audits are trusted by leading organizations building decentralized systems. Browse through past public audits in our blog and follow our quality checklist before going to production. To learn more about OpenZeppelin’s audit process and request an audit, please visit our security audits site.

Learn

Comprehensive guides for every step of your development journey.

Setting Up a Node Project Install node, npm, and the basic libraries for web3 development.

Developing Smart Contracts Write and compile your first Solidity contracts, using the building blocks from the OpenZeppelin Contracts library.

Deploying and Interacting Deploy your contracts to a local blockchain and send your first transactions using the console.

Writing Automated Tests Unit test your contracts with assertions from OpenZeppelin Test Helpers and test using the OpenZeppelin Test Environment.

Connecting to Public Test Networks Set up a staging environment by deploying your app to a public Ethereum testnet.

Upgrading Smart Contracts Change the code of your deployed contracts to add new features or fix bugs, using OpenZeppelin Upgrades Plugins.

Preparing for Mainnet All the boxes you need to check before taking your project to production on the main Ethereum network.

Check out the OpenZeppelin forum for additional community-contributed guides!

Ethernaut

Learn more about security in Solidity contracts by playing Ethernaut. Every level in Ethernaut is a smart contract waiting to be hacked, and teaches you a vulnerability by having you exploit it - many of them based on real-life hacks! You can discuss your solutions or ask for tips in our forum.

Questions?

Join the OpenZeppelin community in our forum to ask for help, as well as share your feedback or showcase what you have built with OpenZeppelin!

Share the Love!

If you are using OpenZeppelin contracts, tools, or libraries in your project, share the love with the rest of the community by adding a badge to your README! Let your audience know that your system is built with the most secure components available.

[![built-with openzeppelin](https://img.shields.io/badge/built%20with-OpenZeppelin-3677FF)](https://docs.openzeppelin.com/)