Hardhat is an Ethereum development environment for professionals. It facilitates performing frequent tasks, such as running tests, automatically checking code for mistakes or interacting with smart contracts.

Built by the Nomic Foundation for the Ethereum community.

💡 This is the README for Hardhat 3, the new major version of Hardhat. For the previous version (v2), see this branch instead.

Getting started

To install Hardhat and initialize a new project, run the following command in an empty directory:

npx hardhat --init

This will take you through an interactive setup process to get started.

Learn more

To learn more about Hardhat, check out the documentation.

Contributing

Contributions are always welcome! Feel free to open any issue or send a pull request.

Go to CONTRIBUTING.md to learn about how to set up Hardhat's development environment.

@nomicfoundation/hardhat-network-helpers

3.0.0

Major Changes

• 29cc141: First release of Hardhat 3!

1.1.0

Minor Changes

• 14b3042: Updated the minimal supported version of Node to v20 (#6982)

1.0.13

Patch Changes

• 538b03c: Accept 0x as a valid value for setCode, thanks @arr00 (#6844)

1.0.12

Patch Changes

• 8fa15e7: Add support for ZKsync's development mode

1.0.11

Patch Changes

• 8be0c2c: Improve an error message and add a utility to clear all the existing snaphosts.

1.0.10

Patch Changes

• 43d75470c: Added support for using network helpers on anvil network (thanks @tmigone!)

1.0.9

Patch Changes

• 9715d4195: Added support for receiving Date instances in increaseTo network helper (thanks @Saty248)

1.0.8

Patch Changes

• e443b3667: Added an option in Hardhat Network to allow mining blocks with the same timestamp
• 8a4ad9ddc: Added a new 'reset' network helper

1.0.7

Patch Changes

• 15b8b61f6: Fixed an error triggered by certain combinations of loadFixture calls (#3249, thanks @skosito!)

1.0.6

Patch Changes

• 89f153a72: Fix setStorageAt so it can accept multiple leading zeros in the slot

1.0.5

Patch Changes

• f3ba15ca8: Added a new setPrevRandao helper

1.0.4

Patch Changes

• 4dddc5370: Fix peer dependency on hardhat to pull in hardhat/common

1.0.3

Patch Changes

• d9fb21a5b: - Disallow using anonymous functions as fixtures