mattgstevens / openzeppelin-solidity

OpenZeppelin, a framework to build secure smart contracts on Ethereum

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OpenZeppelin Solidity

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OpenZeppelin is a library for writing secure Smart Contracts on Ethereum.

With OpenZeppelin, you can build distributed applications, protocols and organizations:

NOTE: New to smart contract development? Check our introductory guide.

Getting Started

OpenZeppelin integrates with Truffle and Embark.


To use with Truffle, first install it and initialize your project with truffle init.

npm install -g truffle
mkdir myproject && cd myproject
truffle init


To use with Embark, first install it and initialize your project with embark new MyApp.

npm install -g embark
embark new MyApp
cd MyApp

Installing OpenZeppelin

After installing either Framework, to install the OpenZeppelin library, run the following in your Solidity project root directory:

npm init -y
npm install -E openzeppelin-solidity

Note that OpenZeppelin does not currently follow semantic versioning. You may encounter breaking changes upon a minor version bump. We recommend pinning the version of OpenZeppelin you use, as done by the -E (--save-exact) option.

After that, you'll get all the library's contracts in the node_modules/openzeppelin-solidity/contracts folder. You can use the contracts in the library like so:

import 'openzeppelin-solidity/contracts/ownership/Ownable.sol';

contract MyContract is Ownable {

If you are using Embark, you can also import directly from github:

import "";

contract MyContract is Ownable {


OpenZeppelin is meant to provide secure, tested and community-audited code, but please use common sense when doing anything that deals with real money! We take no responsibility for your implementation decisions and any security problem you might experience.

If you find a security issue, please email

Developer Resources

Building a distributed application, protocol or organization with OpenZeppelin?

Interested in contributing to OpenZeppelin?


Code released under the MIT License.


OpenZeppelin, a framework to build secure smart contracts on Ethereum

License:MIT License


Language:JavaScript 61.6%Language:Solidity 37.7%Language:Shell 0.7%