Open Source JavaScript Smart Contract Tools

A library for secure smart contract development. Build on a solid foundation of community-vetted code. OpenZeppelin Contracts uses semantic versioning to communicate backward compatibility of its API and storage layout. To keep your system secure, you should always use the installed code as-is, and neither copy-paste it from online sources nor modify it yourself. The library is designed so that only the contracts and functions you use are deployed, so you don't need to worry about it needlessly increasing gas costs. Reduce the risk of vulnerabilities in your applications by using standard, tested, community-reviewed code.

Embark is a platform that enables easy development and deployment of decentralized applications. Build, test, and deploy your Smart Contracts without the hassle. Embark takes care of the groundwork, watches for changes, and redeploys your application when needed. Testing shouldn't be an afterthought. Embark makes debugging and testing first-class citizens of your development workflow. Pick and choose which features, plugins and tools you want to integrate with. Embark is built with modularity in mind. Gives an overview of all processes controlled by Embark. It also comes with an interactive console and predictive commands. Cockpit's explorer lets you easily review any transactions, Smart Contracts, and accounts. With Cockpit you can iteratively and selectively deploy your Smart Contracts, removing headaches associated with complex applications. Edit your source files from right within Cockpit for quick and easy updates.

Decentralized human identity without sybils or bots. Built with Kleros and the Ethereum community. No servers or databases are used. Control your identity with any Ethereum wallet. Contribute to the success of UBI and Proof of Humanity by leveraging ETH. Keep ETH or DAI in our smart contract vaults and help burn UBI tokens using yield. Half the yield is used to buy UBI. UBI is then burned, reducing its supply. No biometrics or real names are required. Just a quick video that proves your humanity. Audit any profile without permission. Challenged profiles go to a Kleros court. UBI is a Universal Basic Income token that gets streamed using Ethereum to verified Proof of Humanity profiles. ETH or DAI is lended via Yearn Finance. Earn the cumulative interest.

A Blockchain-based, self-hosted, and end-to-end encrypted cloud storage. Devault is a decentralized, self-hosted, and end-to-end encrypted alternative to proprietary and centralized cloud storage. The file gets encrypted using AES-256-CBC encryption. The encrypted file is split into pieces. The chunks are distributed across the network nodes. The root hash will be stored in your wallet on the blockchain.

Ethlint (Formerly Solium) analyzes your Solidity code for style & security issues and fixes them. Standardize Smart Contract practices across your organization. Integrate with your build system. Deploy with confidence! Solium does not strictly follow Solidity Style Guide. The practices it enforces by default are best practices for the community at large. If you’re using vim with syntastic, and prefer to use a locally installed version of Solium (rather than a global version), you can install syntastic local solium to automatically load the local version in packages that have installed their own. Solium does not strictly adhere to Solidity Style Guide. It aims to promote coding practices agreed upon by the community at large. You can specify rules or plugins to apply as command line options. If you specify one, it overrides its corresponding configuration in the soliumrc file.

Neoblog is a public blogging platform that's completely serverless. Reading and posting articles to our platform require no servers and runs completely on the NEO Blockchain and IPFS. The traditional way of setting up a blog is to set up a server that will store your content. With modern technologies, we are advancing into an age that moves away from traditional servers. Combine this with the decentralization of storage (IPFS) and blockchain, we now have a toolkit to provide an application that's completely serverless. Neoblog is a serverless application that uses these these technologies: built on the NEO blockchain, articles are posted to our smart contract, while the content is stored on IPFS.

Visualize Solidity control flow for smart contract security analysis. Generates a DOT graph that visualizes the function control flow of a Solidity contract and highlights potential security vulnerabilities. A nice example of piping contract source that is in your clipboard through solgraph, dot, and preview: (Use whatever image previewer is available on your system; Preview.app is available on Mac) You have to have graphviz installed (brew install graphviz) to render the DOT file as an image. Depending on your permissions, you may need to add the unsafe-perm flag.

Web4 is a new way to distribute decentralized apps. Deploy a single WASM smart contract to deploy the whole web app. You only need to deploy a single smart contract using WebAssembly to host your app's HTTP backend, static resources, and blockchain logic. There is an HTTP gateway to NEAR blockchain which allows smart contract to handle arbitrary GET requests. Every smart contract on NEAR also gets a corresponding API endpoint which can be accessed through regular HTTP requests. You can load any required data in web4_get by returning list of URLs to preload in preloadUrls field. Note that both JSON and form data are supported. When transaction is processed by server user gets redirected to wallet for signing this transaction.