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Developer tools · #hardhat
Stop relying on mocks for external contracts. Learn how to use Hardhat Network Forking to clone mainnet state for deterministic, realistic integration testing.
Learn how to implement Mainnet Forking in Hardhat to test smart contracts against real-world blockchain state without risking production funds.
Forking lets you run integration tests against a pinned copy of mainnet state. This guide covers configuration, impersonation, archive requirements, and how to avoid flaky tests.
Hardhat mainnet forking lets you run integration tests against real deployed contracts and balances locally. Learn the setup, a worked impersonation example, and the RPC trade-offs.
When a Hardhat fork doesn’t reflect mainnet data, transactions revert or gas estimates skew, the problem often lies in the fork configuration. This guide walks through symptoms, causes, and step‑by‑step checks to restore a consistent forked state.
Fork mainnet at a fixed block and cache state locally to get deterministic integration tests against real deployed contracts without spending gas.
A decision guide comparing Hardhat forking, snapshot and Anvil for mainnet-state contract testing, with configuration, trade-offs, and verification steps.
Learn why transactions revert when using a Hardhat fork, how to check the fork block versus contract deployment, and what fixes or escalation steps to take.
Learn how to use Hardhat Ignition to replace fragile deployment scripts with a declarative, state-tracked system that prevents redundant transactions and manages contract dependencies.
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