Run Solidity tests on a Rust-powered runtime
Deploy your contracts, run Solidity tests, and debug your code on Hardhat’s new runtime written in Rust for outstanding performance.
Ready to use out of the box
Hardhat includes everything you need for Solidity smart contract development. Testing, deployment, code coverage, code verification, and more.
Why hardhat?
Clear errors and Solidity stack traces
When transactions revert, Hardhat shows actionable errors like “Non-payable function was called with value 1,” alongside detailed Solidity stack traces to pinpoint exactly where and why your code fails.
Comprehensive testing approach
Write unit tests in Solidity for speed and conciseness, integration tests in TypeScript for expressiveness and complexity, or fuzzing tests to push the edges. Decide on a case by case basis.
Multi-chain ready: Optimism’s OP Stack and Base simulation support
Manage multiple networks at the same time and confidently deploy on OP Stack knowing your code was tested on an accurate simulation.
Simple and reliable deployments
Define your contract instances, their operations, and Hardhat Ignition will drive the complex details and parallelize execution.
Plugin ecosystem
Extend Hardhat with a composable ecosystem of plugins that add functionality and integrate your existing tools into a smooth workflow.
TypeScript extensibility
A tooling platform designed to be extended, Hardhat has all the utilities you need to address your project-specific needs. Change anything you like. Even entire built-in tasks, or just parts of them.
For teams and projects of any scale
From single hacker quickly iterating on a proof of concept to full blown engineering organization dealing with ad-hoc needs at scale, Hardhat adapts as your needs change
Flexible. Extensible. Fast.
Build your software your way—without limitations.
What's new in Hardhat
4 days ago
hardhat 3.0.9
This release is a small bug fix release to resolve an ordering issue with the `npx hardhat flatten` task.
Learn more 4 days ago
hardhat-node-test-runner 3.0.4
This release is a small improvement to automatically set `NODE_ENV` to "test" when running the `npx hardhat test nodejs` task.
Learn more 4 days ago
hardhat-mocha 3.0.4
This release is a small improvement to automatically set `NODE_ENV` to "test" when running the `npx hardhat test mocha` task.
Learn more From the Hardhat blog
Solidity vs. TypeScript tests: How to choose and combine in Hardhat 3
Testing is central to Ethereum smart contract development, as bugs and vulnerabilities can lead to catastrophic losses. Most projects tests contracts either in TypeScript or Solidity. With Hardhat 3, you don’t have to choose between writing all your tests in Solidity or in TypeScript — both are first-class options, they can be combined, and each brings their unique strengths. The key is knowing where each approach fits best, and how they complement one another. Solidity Tests Writing tests d
Rust-powered Hardhat: Present & Future
In March, we released Hardhat v2.21.0, the first version powered by our brand new Ethereum Development Runtime (EDR, for short) implemented in Rust. This was a significant change under the hood, representing the rewriting of Hardhat's largest and most complex component—its Ethereum simulation layer—in a new language. By design, this update didn’t affect the user experience beyond improving performance. In this post, we’ll explain why we built EDR, discuss its current status, and outline what’s c
Secure deployments with Hardhat Ignition and Ledger hardware wallets
As you may know, we recently introduced Hardhat Ignition, a declarative system for deploying smart contracts on Ethereum, which aims to…